SDL  2.0
SDL_surface.h File Reference
#include "SDL_stdinc.h"
#include "SDL_pixels.h"
#include "SDL_rect.h"
#include "SDL_blendmode.h"
#include "SDL_rwops.h"
#include "begin_code.h"
#include "close_code.h"
+ Include dependency graph for SDL_surface.h:
+ This graph shows which files directly or indirectly include this file:

Go to the source code of this file.

Data Structures

struct  SDL_Surface
 A collection of pixels used in software blitting. More...
 

Macros

#define SDL_MUSTLOCK(S)   (((S)->flags & SDL_RLEACCEL) != 0)
 
#define SDL_LoadBMP(file)   SDL_LoadBMP_RW(SDL_RWFromFile(file, "rb"), 1)
 
#define SDL_SaveBMP(surface, file)   SDL_SaveBMP_RW(surface, SDL_RWFromFile(file, "wb"), 1)
 
#define SDL_BlitSurface   SDL_UpperBlit
 
#define SDL_BlitScaled   SDL_UpperBlitScaled
 
Surface flags

These are the currently supported flags for the SDL_Surface.

Used internally (read-only).

#define SDL_SWSURFACE   0
 
#define SDL_PREALLOC   0x00000001
 
#define SDL_RLEACCEL   0x00000002
 
#define SDL_DONTFREE   0x00000004
 

Typedefs

typedef int(* SDL_blit) (struct SDL_Surface *src, SDL_Rect *srcrect, struct SDL_Surface *dst, SDL_Rect *dstrect)
 The type of function used for surface blitting functions. More...
 

Functions

SDL_SurfaceSDL_CreateRGBSurface (Uint32 flags, int width, int height, int depth, Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask)
 
SDL_SurfaceSDL_CreateRGBSurfaceWithFormat (Uint32 flags, int width, int height, int depth, Uint32 format)
 
SDL_SurfaceSDL_CreateRGBSurfaceFrom (void *pixels, int width, int height, int depth, int pitch, Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask)
 
SDL_SurfaceSDL_CreateRGBSurfaceWithFormatFrom (void *pixels, int width, int height, int depth, int pitch, Uint32 format)
 
void SDL_FreeSurface (SDL_Surface *surface)
 
int SDL_SetSurfacePalette (SDL_Surface *surface, SDL_Palette *palette)
 Set the palette used by a surface. More...
 
int SDL_LockSurface (SDL_Surface *surface)
 Sets up a surface for directly accessing the pixels. More...
 
void SDL_UnlockSurface (SDL_Surface *surface)
 
SDL_SurfaceSDL_LoadBMP_RW (SDL_RWops *src, int freesrc)
 
int SDL_SaveBMP_RW (SDL_Surface *surface, SDL_RWops *dst, int freedst)
 
int SDL_SetSurfaceRLE (SDL_Surface *surface, int flag)
 Sets the RLE acceleration hint for a surface. More...
 
int SDL_SetColorKey (SDL_Surface *surface, int flag, Uint32 key)
 Sets the color key (transparent pixel) in a blittable surface. More...
 
int SDL_GetColorKey (SDL_Surface *surface, Uint32 *key)
 Gets the color key (transparent pixel) in a blittable surface. More...
 
int SDL_SetSurfaceColorMod (SDL_Surface *surface, Uint8 r, Uint8 g, Uint8 b)
 Set an additional color value used in blit operations. More...
 
int SDL_GetSurfaceColorMod (SDL_Surface *surface, Uint8 *r, Uint8 *g, Uint8 *b)
 Get the additional color value used in blit operations. More...
 
int SDL_SetSurfaceAlphaMod (SDL_Surface *surface, Uint8 alpha)
 Set an additional alpha value used in blit operations. More...
 
int SDL_GetSurfaceAlphaMod (SDL_Surface *surface, Uint8 *alpha)
 Get the additional alpha value used in blit operations. More...
 
int SDL_SetSurfaceBlendMode (SDL_Surface *surface, SDL_BlendMode blendMode)
 Set the blend mode used for blit operations. More...
 
int SDL_GetSurfaceBlendMode (SDL_Surface *surface, SDL_BlendMode *blendMode)
 Get the blend mode used for blit operations. More...
 
SDL_bool SDL_SetClipRect (SDL_Surface *surface, const SDL_Rect *rect)
 
void SDL_GetClipRect (SDL_Surface *surface, SDL_Rect *rect)
 
SDL_SurfaceSDL_ConvertSurface (SDL_Surface *src, const SDL_PixelFormat *fmt, Uint32 flags)
 
SDL_SurfaceSDL_ConvertSurfaceFormat (SDL_Surface *src, Uint32 pixel_format, Uint32 flags)
 
int SDL_ConvertPixels (int width, int height, Uint32 src_format, const void *src, int src_pitch, Uint32 dst_format, void *dst, int dst_pitch)
 Copy a block of pixels of one format to another format. More...
 
int SDL_FillRect (SDL_Surface *dst, const SDL_Rect *rect, Uint32 color)
 
int SDL_FillRects (SDL_Surface *dst, const SDL_Rect *rects, int count, Uint32 color)
 
int SDL_UpperBlit (SDL_Surface *src, const SDL_Rect *srcrect, SDL_Surface *dst, SDL_Rect *dstrect)
 
int SDL_LowerBlit (SDL_Surface *src, SDL_Rect *srcrect, SDL_Surface *dst, SDL_Rect *dstrect)
 
int SDL_SoftStretch (SDL_Surface *src, const SDL_Rect *srcrect, SDL_Surface *dst, const SDL_Rect *dstrect)
 Perform a fast, low quality, stretch blit between two surfaces of the same pixel format. More...
 
int SDL_UpperBlitScaled (SDL_Surface *src, const SDL_Rect *srcrect, SDL_Surface *dst, SDL_Rect *dstrect)
 
int SDL_LowerBlitScaled (SDL_Surface *src, SDL_Rect *srcrect, SDL_Surface *dst, SDL_Rect *dstrect)
 

Detailed Description

Header file for SDL_Surface definition and management functions.

Definition in file SDL_surface.h.

Macro Definition Documentation

◆ SDL_BlitScaled

#define SDL_BlitScaled   SDL_UpperBlitScaled

Definition at line 486 of file SDL_surface.h.

Referenced by SW_RenderCopy(), and SW_RenderCopyEx().

◆ SDL_BlitSurface

#define SDL_BlitSurface   SDL_UpperBlit

Performs a fast blit from the source surface to the destination surface.

This assumes that the source and destination rectangles are the same size. If either srcrect or dstrect are NULL, the entire surface (src or dst) is copied. The final blit rectangles are saved in srcrect and dstrect after all clipping is performed.

Returns
If the blit is successful, it returns 0, otherwise it returns -1.

The blit function should not be called on a locked surface.

The blit semantics for surfaces with and without blending and colorkey are defined as follows:

RGBA->RGB:
  Source surface blend mode set to SDL_BLENDMODE_BLEND:
    alpha-blend (using the source alpha-channel and per-surface alpha)
    SDL_SRCCOLORKEY ignored.
  Source surface blend mode set to SDL_BLENDMODE_NONE:
    copy RGB.
    if SDL_SRCCOLORKEY set, only copy the pixels matching the
    RGB values of the source color key, ignoring alpha in the
    comparison.

RGB->RGBA:
  Source surface blend mode set to SDL_BLENDMODE_BLEND:
    alpha-blend (using the source per-surface alpha)
  Source surface blend mode set to SDL_BLENDMODE_NONE:
    copy RGB, set destination alpha to source per-surface alpha value.
  both:
    if SDL_SRCCOLORKEY set, only copy the pixels matching the
    source color key.

RGBA->RGBA:
  Source surface blend mode set to SDL_BLENDMODE_BLEND:
    alpha-blend (using the source alpha-channel and per-surface alpha)
    SDL_SRCCOLORKEY ignored.
  Source surface blend mode set to SDL_BLENDMODE_NONE:
    copy all of RGBA to the destination.
    if SDL_SRCCOLORKEY set, only copy the pixels matching the
    RGB values of the source color key, ignoring alpha in the
    comparison.

RGB->RGB:
  Source surface blend mode set to SDL_BLENDMODE_BLEND:
    alpha-blend (using the source per-surface alpha)
  Source surface blend mode set to SDL_BLENDMODE_NONE:
    copy RGB.
  both:
    if SDL_SRCCOLORKEY set, only copy the pixels matching the
    source color key.

You should call SDL_BlitSurface() unless you know exactly how SDL blitting works internally and how to use the other blit functions.

Definition at line 457 of file SDL_surface.h.

Referenced by _testBlitBlendMode(), SDL_UpperBlitScaled(), SW_RenderCopy(), and SW_RenderCopyEx().

◆ SDL_DONTFREE

#define SDL_DONTFREE   0x00000004

Surface is referenced internally

Definition at line 55 of file SDL_surface.h.

Referenced by SDL_DestroyWindow(), SDL_FreeSurface(), SDL_GetWindowSurface(), and SDL_RecreateWindow().

◆ SDL_LoadBMP

#define SDL_LoadBMP (   file)    SDL_LoadBMP_RW(SDL_RWFromFile(file, "rb"), 1)

Load a surface from a file.

Convenience macro.

Definition at line 186 of file SDL_surface.h.

Referenced by init_color_cursor(), LoadSprite(), LoadTexture(), main(), SDLTest_LoadIcon(), surface_testLoadFailure(), and surface_testSaveLoadBitmap().

◆ SDL_MUSTLOCK

#define SDL_MUSTLOCK (   S)    (((S)->flags & SDL_RLEACCEL) != 0)

Evaluates to true if the surface needs to be locked before access.

Definition at line 61 of file SDL_surface.h.

Referenced by SDL_CalculateShapeBitmap(), SDL_CalculateShapeTree(), SDL_CreateTextureFromSurface(), SDL_RLEAlphaBlit(), SDL_RLEBlit(), SDL_SoftBlit(), SDL_SoftStretch(), SDLgfx_rotateSurface(), and SW_UpdateTexture().

◆ SDL_PREALLOC

#define SDL_PREALLOC   0x00000001

◆ SDL_RLEACCEL

◆ SDL_SaveBMP

#define SDL_SaveBMP (   surface,
  file 
)    SDL_SaveBMP_RW(surface, SDL_RWFromFile(file, "wb"), 1)

Save a surface to a file.

Convenience macro.

Definition at line 209 of file SDL_surface.h.

Referenced by SDLTest_CompareSurfaces(), SDLTest_ScreenShot(), and surface_testSaveLoadBitmap().

◆ SDL_SWSURFACE

#define SDL_SWSURFACE   0

Just here for compatibility

Definition at line 52 of file SDL_surface.h.

Referenced by _surfaceSetUp(), SDLgfx_rotateSurface(), SDLTest_DrawCharacter(), and SW_RenderCopyEx().

Typedef Documentation

◆ SDL_blit

typedef int(* SDL_blit) (struct SDL_Surface *src, SDL_Rect *srcrect, struct SDL_Surface *dst, SDL_Rect *dstrect)

The type of function used for surface blitting functions.

Definition at line 97 of file SDL_surface.h.

Function Documentation

◆ SDL_ConvertPixels()

int SDL_ConvertPixels ( int  width,
int  height,
Uint32  src_format,
const void src,
int  src_pitch,
Uint32  dst_format,
void dst,
int  dst_pitch 
)

Copy a block of pixels of one format to another format.

Returns
0 on success, or -1 if there was an error

Definition at line 1057 of file SDL_surface.c.

References SDL_Rect::h, i, rect, SDL_BYTESPERPIXEL, SDL_CreateSurfaceOnStack(), SDL_InvalidParamError, SDL_ISPIXELFORMAT_FOURCC, SDL_LowerBlit(), SDL_memcpy, SDL_PIXELFORMAT_IYUV, SDL_PIXELFORMAT_NV12, SDL_PIXELFORMAT_NV21, SDL_PIXELFORMAT_UYVY, SDL_PIXELFORMAT_YUY2, SDL_PIXELFORMAT_YV12, SDL_PIXELFORMAT_YVYU, SDL_SetError, SDL_Rect::w, SDL_Rect::x, and SDL_Rect::y.

1060 {
1061  SDL_Surface src_surface, dst_surface;
1062  SDL_PixelFormat src_fmt, dst_fmt;
1063  SDL_BlitMap src_blitmap, dst_blitmap;
1064  SDL_Rect rect;
1065  void *nonconst_src = (void *) src;
1066 
1067  /* Check to make sure we are blitting somewhere, so we don't crash */
1068  if (!dst) {
1069  return SDL_InvalidParamError("dst");
1070  }
1071  if (!dst_pitch) {
1072  return SDL_InvalidParamError("dst_pitch");
1073  }
1074 
1075  /* Fast path for same format copy */
1076  if (src_format == dst_format) {
1077  int bpp, i;
1078 
1079  if (SDL_ISPIXELFORMAT_FOURCC(src_format)) {
1080  switch (src_format) {
1081  case SDL_PIXELFORMAT_YUY2:
1082  case SDL_PIXELFORMAT_UYVY:
1083  case SDL_PIXELFORMAT_YVYU:
1084  bpp = 2;
1085  break;
1086  case SDL_PIXELFORMAT_YV12:
1087  case SDL_PIXELFORMAT_IYUV:
1088  case SDL_PIXELFORMAT_NV12:
1089  case SDL_PIXELFORMAT_NV21:
1090  bpp = 1;
1091  break;
1092  default:
1093  return SDL_SetError("Unknown FOURCC pixel format");
1094  }
1095  } else {
1096  bpp = SDL_BYTESPERPIXEL(src_format);
1097  }
1098  width *= bpp;
1099 
1100  for (i = height; i--;) {
1101  SDL_memcpy(dst, src, width);
1102  src = (Uint8*)src + src_pitch;
1103  dst = (Uint8*)dst + dst_pitch;
1104  }
1105 
1106  if (src_format == SDL_PIXELFORMAT_YV12 || src_format == SDL_PIXELFORMAT_IYUV) {
1107  /* U and V planes are a quarter the size of the Y plane */
1108  width /= 2;
1109  height /= 2;
1110  src_pitch /= 2;
1111  dst_pitch /= 2;
1112  for (i = height * 2; i--;) {
1113  SDL_memcpy(dst, src, width);
1114  src = (Uint8*)src + src_pitch;
1115  dst = (Uint8*)dst + dst_pitch;
1116  }
1117  } else if (src_format == SDL_PIXELFORMAT_NV12 || src_format == SDL_PIXELFORMAT_NV21) {
1118  /* U/V plane is half the height of the Y plane */
1119  height /= 2;
1120  for (i = height; i--;) {
1121  SDL_memcpy(dst, src, width);
1122  src = (Uint8*)src + src_pitch;
1123  dst = (Uint8*)dst + dst_pitch;
1124  }
1125  }
1126  return 0;
1127  }
1128 
1129  if (!SDL_CreateSurfaceOnStack(width, height, src_format, nonconst_src,
1130  src_pitch,
1131  &src_surface, &src_fmt, &src_blitmap)) {
1132  return -1;
1133  }
1134  if (!SDL_CreateSurfaceOnStack(width, height, dst_format, dst, dst_pitch,
1135  &dst_surface, &dst_fmt, &dst_blitmap)) {
1136  return -1;
1137  }
1138 
1139  /* Set up the rect and go! */
1140  rect.x = 0;
1141  rect.y = 0;
1142  rect.w = width;
1143  rect.h = height;
1144  return SDL_LowerBlit(&src_surface, &rect, &dst_surface, &rect);
1145 }
GLenum GLenum dst
GLint GLint GLsizei width
Definition: SDL_opengl.h:1565
SDL_Rect rect
Definition: testrelative.c:27
static SDL_INLINE SDL_bool SDL_CreateSurfaceOnStack(int width, int height, Uint32 pixel_format, void *pixels, int pitch, SDL_Surface *surface, SDL_PixelFormat *format, SDL_BlitMap *blitmap)
Definition: SDL_surface.c:1019
A collection of pixels used in software blitting.
Definition: SDL_surface.h:69
#define SDL_BYTESPERPIXEL(X)
Definition: SDL_pixels.h:128
#define SDL_InvalidParamError(param)
Definition: SDL_error.h:54
GLint GLint GLsizei GLsizei height
Definition: SDL_opengl.h:1565
int SDL_LowerBlit(SDL_Surface *src, SDL_Rect *srcrect, SDL_Surface *dst, SDL_Rect *dstrect)
Definition: SDL_surface.c:535
#define SDL_memcpy
uint8_t Uint8
An unsigned 8-bit integer type.
Definition: SDL_stdinc.h:143
int x
Definition: SDL_rect.h:66
int w
Definition: SDL_rect.h:67
return Display return Display Bool Bool int int int return Display XEvent Bool(*) XPointer return Display return Display Drawable _Xconst char unsigned int unsigned int return Display Pixmap Pixmap XColor XColor unsigned int unsigned int return Display _Xconst char char int char return Display Visual unsigned int int int char unsigned int unsigned int in i)
Definition: SDL_x11sym.h:50
#define SDL_SetError
int h
Definition: SDL_rect.h:67
#define SDL_ISPIXELFORMAT_FOURCC(format)
Definition: SDL_pixels.h:167
GLenum src
int y
Definition: SDL_rect.h:66
A rectangle, with the origin at the upper left.
Definition: SDL_rect.h:64

◆ SDL_ConvertSurface()

SDL_Surface* SDL_ConvertSurface ( SDL_Surface src,
const SDL_PixelFormat fmt,
Uint32  flags 
)

Creates a new surface of the specified format, and then copies and maps the given surface to it so the blit of the converted surface will be as fast as possible. If this function fails, it returns NULL.

The flags parameter is passed to SDL_CreateRGBSurface() and has those semantics. You can also pass SDL_RLEACCEL in the flags parameter and SDL will try to RLE accelerate colorkey and alpha blits in the resulting surface.

Definition at line 877 of file SDL_surface.c.

References SDL_BlitInfo::a, SDL_Color::a, SDL_PixelFormat::Amask, SDL_BlitInfo::b, SDL_Color::b, SDL_PixelFormat::BitsPerPixel, SDL_PixelFormat::Bmask, SDL_Surface::clip_rect, SDL_BlitInfo::colorkey, SDL_Palette::colors, SDL_BlitInfo::flags, SDL_Surface::format, SDL_BlitInfo::g, SDL_Color::g, SDL_PixelFormat::Gmask, SDL_Rect::h, SDL_Surface::h, i, SDL_BlitMap::info, SDL_Surface::map, SDL_Palette::ncolors, NULL, SDL_PixelFormat::palette, SDL_BlitInfo::r, SDL_Color::r, SDL_PixelFormat::Rmask, SDL_BLENDMODE_BLEND, SDL_ConvertColorkeyToAlpha(), SDL_COPY_BLEND, SDL_COPY_COLORKEY, SDL_COPY_MODULATE_ALPHA, SDL_COPY_RLE_ALPHAKEY, SDL_COPY_RLE_COLORKEY, SDL_COPY_RLE_DESIRED, SDL_CreateRGBSurface(), SDL_FALSE, SDL_GetRGBA, SDL_InvalidateMap(), SDL_LowerBlit(), SDL_MapRGBA, SDL_memcmp, SDL_memcpy, SDL_RLEACCEL, SDL_SetClipRect(), SDL_SetColorKey(), SDL_SetError, SDL_SetSurfaceBlendMode(), SDL_SetSurfaceRLE(), SDL_TRUE, SDL_Rect::w, SDL_Surface::w, SDL_Rect::x, and SDL_Rect::y.

Referenced by SDL_ConvertSurfaceFormat().

879 {
880  SDL_Surface *convert;
881  Uint32 copy_flags;
882  SDL_Color copy_color;
883  SDL_Rect bounds;
884 
885  /* Check for empty destination palette! (results in empty image) */
886  if (format->palette != NULL) {
887  int i;
888  for (i = 0; i < format->palette->ncolors; ++i) {
889  if ((format->palette->colors[i].r != 0xFF) ||
890  (format->palette->colors[i].g != 0xFF) ||
891  (format->palette->colors[i].b != 0xFF))
892  break;
893  }
894  if (i == format->palette->ncolors) {
895  SDL_SetError("Empty destination palette");
896  return (NULL);
897  }
898  }
899 
900  /* Create a new surface with the desired format */
901  convert = SDL_CreateRGBSurface(flags, surface->w, surface->h,
902  format->BitsPerPixel, format->Rmask,
903  format->Gmask, format->Bmask,
904  format->Amask);
905  if (convert == NULL) {
906  return (NULL);
907  }
908 
909  /* Copy the palette if any */
910  if (format->palette && convert->format->palette) {
911  SDL_memcpy(convert->format->palette->colors,
912  format->palette->colors,
913  format->palette->ncolors * sizeof(SDL_Color));
914  convert->format->palette->ncolors = format->palette->ncolors;
915  }
916 
917  /* Save the original copy flags */
918  copy_flags = surface->map->info.flags;
919  copy_color.r = surface->map->info.r;
920  copy_color.g = surface->map->info.g;
921  copy_color.b = surface->map->info.b;
922  copy_color.a = surface->map->info.a;
923  surface->map->info.r = 0xFF;
924  surface->map->info.g = 0xFF;
925  surface->map->info.b = 0xFF;
926  surface->map->info.a = 0xFF;
927  surface->map->info.flags = 0;
928  SDL_InvalidateMap(surface->map);
929 
930  /* Copy over the image data */
931  bounds.x = 0;
932  bounds.y = 0;
933  bounds.w = surface->w;
934  bounds.h = surface->h;
935  SDL_LowerBlit(surface, &bounds, convert, &bounds);
936 
937  /* Clean up the original surface, and update converted surface */
938  convert->map->info.r = copy_color.r;
939  convert->map->info.g = copy_color.g;
940  convert->map->info.b = copy_color.b;
941  convert->map->info.a = copy_color.a;
942  convert->map->info.flags =
943  (copy_flags &
947  surface->map->info.r = copy_color.r;
948  surface->map->info.g = copy_color.g;
949  surface->map->info.b = copy_color.b;
950  surface->map->info.a = copy_color.a;
951  surface->map->info.flags = copy_flags;
952  SDL_InvalidateMap(surface->map);
953  if (copy_flags & SDL_COPY_COLORKEY) {
954  SDL_bool set_colorkey_by_color = SDL_FALSE;
955 
956  if (surface->format->palette) {
957  if (format->palette &&
958  surface->format->palette->ncolors <= format->palette->ncolors &&
959  (SDL_memcmp(surface->format->palette->colors, format->palette->colors,
960  surface->format->palette->ncolors * sizeof(SDL_Color)) == 0)) {
961  /* The palette is identical, just set the same colorkey */
962  SDL_SetColorKey(convert, 1, surface->map->info.colorkey);
963  } else if (format->Amask) {
964  /* The alpha was set in the destination from the palette */
965  } else {
966  set_colorkey_by_color = SDL_TRUE;
967  }
968  } else {
969  set_colorkey_by_color = SDL_TRUE;
970  }
971 
972  if (set_colorkey_by_color) {
973  /* Set the colorkey by color, which needs to be unique */
974  Uint8 keyR, keyG, keyB, keyA;
975 
976  SDL_GetRGBA(surface->map->info.colorkey, surface->format, &keyR,
977  &keyG, &keyB, &keyA);
978  SDL_SetColorKey(convert, 1,
979  SDL_MapRGBA(convert->format, keyR, keyG, keyB, keyA));
980  /* This is needed when converting for 3D texture upload */
982  }
983  }
984  SDL_SetClipRect(convert, &surface->clip_rect);
985 
986  /* Enable alpha blending by default if the new surface has an
987  * alpha channel or alpha modulation */
988  if ((surface->format->Amask && format->Amask) ||
989  (copy_flags & (SDL_COPY_COLORKEY|SDL_COPY_MODULATE_ALPHA))) {
991  }
992  if ((copy_flags & SDL_COPY_RLE_DESIRED) || (flags & SDL_RLEACCEL)) {
993  SDL_SetSurfaceRLE(convert, SDL_RLEACCEL);
994  }
995 
996  /* We're ready to go! */
997  return (convert);
998 }
Uint8 r
Definition: SDL_blit.h:70
GLint GLint GLsizei GLsizei GLsizei GLint GLenum format
Definition: SDL_opengl.h:1565
Uint8 b
Definition: SDL_blit.h:70
SDL_bool SDL_SetClipRect(SDL_Surface *surface, const SDL_Rect *rect)
Definition: SDL_surface.c:492
#define SDL_COPY_COLORKEY
Definition: SDL_blit.h:39
int SDL_SetSurfaceRLE(SDL_Surface *surface, int flag)
Sets the RLE acceleration hint for a surface.
Definition: SDL_surface.c:191
Uint8 g
Definition: SDL_pixels.h:296
#define SDL_MapRGBA
Uint8 g
Definition: SDL_blit.h:70
A collection of pixels used in software blitting.
Definition: SDL_surface.h:69
int SDL_SetSurfaceBlendMode(SDL_Surface *surface, SDL_BlendMode blendMode)
Set the blend mode used for blit operations.
Definition: SDL_surface.c:426
static void SDL_ConvertColorkeyToAlpha(SDL_Surface *surface)
Definition: SDL_surface.c:275
Uint8 b
Definition: SDL_pixels.h:297
#define SDL_COPY_RLE_COLORKEY
Definition: SDL_blit.h:42
uint32_t Uint32
An unsigned 32-bit integer type.
Definition: SDL_stdinc.h:159
int SDL_LowerBlit(SDL_Surface *src, SDL_Rect *srcrect, SDL_Surface *dst, SDL_Rect *dstrect)
Definition: SDL_surface.c:535
int SDL_SetColorKey(SDL_Surface *surface, int flag, Uint32 key)
Sets the color key (transparent pixel) in a blittable surface.
Definition: SDL_surface.c:212
Uint32 colorkey
Definition: SDL_blit.h:69
#define SDL_COPY_RLE_DESIRED
Definition: SDL_blit.h:41
void SDL_InvalidateMap(SDL_BlitMap *map)
Definition: SDL_pixels.c:974
struct SDL_BlitMap * map
Definition: SDL_surface.h:88
#define SDL_memcpy
Uint8 r
Definition: SDL_pixels.h:295
Uint8 a
Definition: SDL_pixels.h:298
uint8_t Uint8
An unsigned 8-bit integer type.
Definition: SDL_stdinc.h:143
#define SDL_memcmp
int x
Definition: SDL_rect.h:66
int w
Definition: SDL_rect.h:67
#define SDL_GetRGBA
SDL_Rect clip_rect
Definition: SDL_surface.h:85
return Display return Display Bool Bool int int int return Display XEvent Bool(*) XPointer return Display return Display Drawable _Xconst char unsigned int unsigned int return Display Pixmap Pixmap XColor XColor unsigned int unsigned int return Display _Xconst char char int char return Display Visual unsigned int int int char unsigned int unsigned int in i)
Definition: SDL_x11sym.h:50
#define NULL
Definition: begin_code.h:143
SDL_bool
Definition: SDL_stdinc.h:130
SDL_Color * colors
Definition: SDL_pixels.h:305
SDL_PixelFormat * format
Definition: SDL_surface.h:72
#define SDL_SetError
SDL_Surface * SDL_CreateRGBSurface(Uint32 flags, int width, int height, int depth, Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask)
Definition: SDL_surface.c:114
#define SDL_COPY_MODULATE_ALPHA
Definition: SDL_blit.h:35
int h
Definition: SDL_rect.h:67
#define SDL_COPY_RLE_ALPHAKEY
Definition: SDL_blit.h:43
GLbitfield flags
SDL_Palette * palette
Definition: SDL_pixels.h:316
int y
Definition: SDL_rect.h:66
#define SDL_COPY_BLEND
Definition: SDL_blit.h:36
SDL_BlitInfo info
Definition: SDL_blit.h:91
A rectangle, with the origin at the upper left.
Definition: SDL_rect.h:64
#define SDL_RLEACCEL
Definition: SDL_surface.h:54
Uint8 a
Definition: SDL_blit.h:70

◆ SDL_ConvertSurfaceFormat()

SDL_Surface* SDL_ConvertSurfaceFormat ( SDL_Surface src,
Uint32  pixel_format,
Uint32  flags 
)

Definition at line 1001 of file SDL_surface.c.

References NULL, SDL_AllocFormat, SDL_ConvertSurface(), SDL_FreeFormat, and SDL_INLINE.

1003 {
1004  SDL_PixelFormat *fmt;
1005  SDL_Surface *convert = NULL;
1006 
1008  if (fmt) {
1009  convert = SDL_ConvertSurface(surface, fmt, flags);
1010  SDL_FreeFormat(fmt);
1011  }
1012  return convert;
1013 }
SDL_Surface * SDL_ConvertSurface(SDL_Surface *surface, const SDL_PixelFormat *format, Uint32 flags)
Definition: SDL_surface.c:877
A collection of pixels used in software blitting.
Definition: SDL_surface.h:69
#define SDL_AllocFormat
#define SDL_FreeFormat
#define NULL
Definition: begin_code.h:143
Uint32 pixel_format
Definition: testoverlay2.c:152
GLbitfield flags

◆ SDL_CreateRGBSurface()

SDL_Surface* SDL_CreateRGBSurface ( Uint32  flags,
int  width,
int  height,
int  depth,
Uint32  Rmask,
Uint32  Gmask,
Uint32  Bmask,
Uint32  Amask 
)

Allocate and free an RGB surface.

If the depth is 4 or 8 bits, an empty palette is allocated for the surface. If the depth is greater than 8 bits, the pixel format is set using the flags '[RGB]mask'.

If the function runs out of memory, it will return NULL.

Parameters
flagsThe flags are obsolete and should be set to 0.
widthThe width in pixels of the surface to create.
heightThe height in pixels of the surface to create.
depthThe depth in bits of the surface to create.
RmaskThe red mask of the surface to create.
GmaskThe green mask of the surface to create.
BmaskThe blue mask of the surface to create.
AmaskThe alpha mask of the surface to create.

Definition at line 114 of file SDL_surface.c.

References NULL, SDL_CreateRGBSurfaceWithFormat(), SDL_MasksToPixelFormatEnum, SDL_PIXELFORMAT_UNKNOWN, and SDL_SetError.

Referenced by SDL_ConvertSurface(), and SDL_CreateRGBSurfaceFrom().

117 {
118  Uint32 format;
119 
120  /* Get the pixel format */
121  format = SDL_MasksToPixelFormatEnum(depth, Rmask, Gmask, Bmask, Amask);
122  if (format == SDL_PIXELFORMAT_UNKNOWN) {
123  SDL_SetError("Unknown pixel format");
124  return NULL;
125  }
126 
128 }
GLint GLint GLsizei GLsizei GLsizei GLint GLenum format
Definition: SDL_opengl.h:1565
GLint GLint GLsizei width
Definition: SDL_opengl.h:1565
#define SDL_MasksToPixelFormatEnum
uint32_t Uint32
An unsigned 32-bit integer type.
Definition: SDL_stdinc.h:159
GLint GLint GLsizei GLsizei height
Definition: SDL_opengl.h:1565
SDL_Surface * SDL_CreateRGBSurfaceWithFormat(Uint32 flags, int width, int height, int depth, Uint32 format)
Definition: SDL_surface.c:36
#define NULL
Definition: begin_code.h:143
GLint GLint GLsizei GLsizei GLsizei depth
Definition: SDL_opengl.h:1565
#define SDL_SetError
GLbitfield flags

◆ SDL_CreateRGBSurfaceFrom()

SDL_Surface* SDL_CreateRGBSurfaceFrom ( void pixels,
int  width,
int  height,
int  depth,
int  pitch,
Uint32  Rmask,
Uint32  Gmask,
Uint32  Bmask,
Uint32  Amask 
)

Definition at line 134 of file SDL_surface.c.

References SDL_Surface::flags, SDL_Surface::h, NULL, SDL_Surface::pitch, SDL_Surface::pixels, SDL_CreateRGBSurface(), SDL_PREALLOC, SDL_SetClipRect(), and SDL_Surface::w.

138 {
139  SDL_Surface *surface;
140 
141  surface = SDL_CreateRGBSurface(0, 0, 0, depth, Rmask, Gmask, Bmask, Amask);
142  if (surface != NULL) {
143  surface->flags |= SDL_PREALLOC;
144  surface->pixels = pixels;
145  surface->w = width;
146  surface->h = height;
147  surface->pitch = pitch;
148  SDL_SetClipRect(surface, NULL);
149  }
150  return surface;
151 }
SDL_bool SDL_SetClipRect(SDL_Surface *surface, const SDL_Rect *rect)
Definition: SDL_surface.c:492
GLint GLint GLsizei width
Definition: SDL_opengl.h:1565
A collection of pixels used in software blitting.
Definition: SDL_surface.h:69
GLint GLint GLsizei GLsizei GLsizei GLint GLenum GLenum const GLvoid * pixels
Definition: SDL_opengl.h:1565
GLint GLint GLsizei GLsizei height
Definition: SDL_opengl.h:1565
Uint32 flags
Definition: SDL_surface.h:71
void * pixels
Definition: SDL_surface.h:75
#define NULL
Definition: begin_code.h:143
GLint GLint GLsizei GLsizei GLsizei depth
Definition: SDL_opengl.h:1565
SDL_Surface * SDL_CreateRGBSurface(Uint32 flags, int width, int height, int depth, Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask)
Definition: SDL_surface.c:114
#define SDL_PREALLOC
Definition: SDL_surface.h:53

◆ SDL_CreateRGBSurfaceWithFormat()

SDL_Surface* SDL_CreateRGBSurfaceWithFormat ( Uint32  flags,
int  width,
int  height,
int  depth,
Uint32  format 
)

Definition at line 36 of file SDL_surface.c.

References SDL_PixelFormat::Amask, SDL_Color::b, SDL_PixelFormat::BitsPerPixel, SDL_Palette::colors, SDL_Surface::format, SDL_PixelFormat::format, SDL_Color::g, SDL_Surface::h, SDL_Surface::map, SDL_Palette::ncolors, NULL, SDL_Surface::pitch, SDL_Surface::pixels, SDL_Color::r, SDL_Surface::refcount, SDL_AllocBlitMap(), SDL_AllocFormat, SDL_AllocPalette, SDL_BLENDMODE_BLEND, SDL_CalculatePitch(), SDL_calloc(), SDL_FreePalette, SDL_FreeSurface(), SDL_ISPIXELFORMAT_INDEXED, SDL_malloc, SDL_memset, SDL_OutOfMemory, SDL_SetClipRect(), SDL_SetSurfaceBlendMode(), SDL_SetSurfacePalette(), void, and SDL_Surface::w.

Referenced by SDL_CreateRGBSurface(), and SDL_CreateRGBSurfaceWithFormatFrom().

38 {
39  SDL_Surface *surface;
40 
41  /* The flags are no longer used, make the compiler happy */
42  (void)flags;
43 
44  /* Allocate the surface */
45  surface = (SDL_Surface *) SDL_calloc(1, sizeof(*surface));
46  if (surface == NULL) {
48  return NULL;
49  }
50 
51  surface->format = SDL_AllocFormat(format);
52  if (!surface->format) {
53  SDL_FreeSurface(surface);
54  return NULL;
55  }
56  surface->w = width;
57  surface->h = height;
58  surface->pitch = SDL_CalculatePitch(surface);
59  SDL_SetClipRect(surface, NULL);
60 
61  if (SDL_ISPIXELFORMAT_INDEXED(surface->format->format)) {
62  SDL_Palette *palette =
63  SDL_AllocPalette((1 << surface->format->BitsPerPixel));
64  if (!palette) {
65  SDL_FreeSurface(surface);
66  return NULL;
67  }
68  if (palette->ncolors == 2) {
69  /* Create a black and white bitmap palette */
70  palette->colors[0].r = 0xFF;
71  palette->colors[0].g = 0xFF;
72  palette->colors[0].b = 0xFF;
73  palette->colors[1].r = 0x00;
74  palette->colors[1].g = 0x00;
75  palette->colors[1].b = 0x00;
76  }
77  SDL_SetSurfacePalette(surface, palette);
78  SDL_FreePalette(palette);
79  }
80 
81  /* Get the pixels */
82  if (surface->w && surface->h) {
83  surface->pixels = SDL_malloc(surface->h * surface->pitch);
84  if (!surface->pixels) {
85  SDL_FreeSurface(surface);
87  return NULL;
88  }
89  /* This is important for bitmaps */
90  SDL_memset(surface->pixels, 0, surface->h * surface->pitch);
91  }
92 
93  /* Allocate an empty mapping */
94  surface->map = SDL_AllocBlitMap();
95  if (!surface->map) {
96  SDL_FreeSurface(surface);
97  return NULL;
98  }
99 
100  /* By default surface with an alpha mask are set up for blending */
101  if (surface->format->Amask) {
103  }
104 
105  /* The surface is ready to go */
106  surface->refcount = 1;
107  return surface;
108 }
GLint GLint GLsizei GLsizei GLsizei GLint GLenum format
Definition: SDL_opengl.h:1565
SDL_bool SDL_SetClipRect(SDL_Surface *surface, const SDL_Rect *rect)
Definition: SDL_surface.c:492
GLint GLint GLsizei width
Definition: SDL_opengl.h:1565
Uint8 g
Definition: SDL_pixels.h:296
#define SDL_ISPIXELFORMAT_INDEXED(format)
Definition: SDL_pixels.h:134
A collection of pixels used in software blitting.
Definition: SDL_surface.h:69
int SDL_SetSurfaceBlendMode(SDL_Surface *surface, SDL_BlendMode blendMode)
Set the blend mode used for blit operations.
Definition: SDL_surface.c:426
Uint8 b
Definition: SDL_pixels.h:297
#define SDL_AllocFormat
GLint GLint GLsizei GLsizei height
Definition: SDL_opengl.h:1565
struct SDL_BlitMap * map
Definition: SDL_surface.h:88
void * SDL_calloc(size_t nmemb, size_t size)
Uint8 r
Definition: SDL_pixels.h:295
void * pixels
Definition: SDL_surface.h:75
Uint8 BitsPerPixel
Definition: SDL_pixels.h:317
int SDL_SetSurfacePalette(SDL_Surface *surface, SDL_Palette *palette)
Set the palette used by a surface.
Definition: SDL_surface.c:177
#define SDL_AllocPalette
void SDL_FreeSurface(SDL_Surface *surface)
Definition: SDL_surface.c:1151
#define NULL
Definition: begin_code.h:143
#define SDL_OutOfMemory()
Definition: SDL_error.h:52
SDL_Color * colors
Definition: SDL_pixels.h:305
SDL_PixelFormat * format
Definition: SDL_surface.h:72
#define SDL_FreePalette
SDL_PRINTF_FORMAT_STRING const char int SDL_PRINTF_FORMAT_STRING const char int SDL_PRINTF_FORMAT_STRING const char int SDL_PRINTF_FORMAT_STRING const char const char SDL_SCANF_FORMAT_STRING const char return SDL_ThreadFunction const char void return Uint32 return Uint32 void
SDL_BlitMap * SDL_AllocBlitMap(void)
Definition: SDL_pixels.c:954
GLbitfield flags
int SDL_CalculatePitch(SDL_Surface *surface)
Definition: SDL_pixels.c:748
#define SDL_malloc
#define SDL_memset

◆ SDL_CreateRGBSurfaceWithFormatFrom()

SDL_Surface* SDL_CreateRGBSurfaceWithFormatFrom ( void pixels,
int  width,
int  height,
int  depth,
int  pitch,
Uint32  format 
)

Definition at line 158 of file SDL_surface.c.

References SDL_Surface::flags, SDL_Surface::h, NULL, SDL_Surface::pitch, SDL_Surface::pixels, SDL_CreateRGBSurfaceWithFormat(), SDL_PREALLOC, SDL_SetClipRect(), and SDL_Surface::w.

161 {
162  SDL_Surface *surface;
163 
164  surface = SDL_CreateRGBSurfaceWithFormat(0, 0, 0, depth, format);
165  if (surface != NULL) {
166  surface->flags |= SDL_PREALLOC;
167  surface->pixels = pixels;
168  surface->w = width;
169  surface->h = height;
170  surface->pitch = pitch;
171  SDL_SetClipRect(surface, NULL);
172  }
173  return surface;
174 }
GLint GLint GLsizei GLsizei GLsizei GLint GLenum format
Definition: SDL_opengl.h:1565
SDL_bool SDL_SetClipRect(SDL_Surface *surface, const SDL_Rect *rect)
Definition: SDL_surface.c:492
GLint GLint GLsizei width
Definition: SDL_opengl.h:1565
A collection of pixels used in software blitting.
Definition: SDL_surface.h:69
GLint GLint GLsizei GLsizei GLsizei GLint GLenum GLenum const GLvoid * pixels
Definition: SDL_opengl.h:1565
GLint GLint GLsizei GLsizei height
Definition: SDL_opengl.h:1565
Uint32 flags
Definition: SDL_surface.h:71
SDL_Surface * SDL_CreateRGBSurfaceWithFormat(Uint32 flags, int width, int height, int depth, Uint32 format)
Definition: SDL_surface.c:36
void * pixels
Definition: SDL_surface.h:75
#define NULL
Definition: begin_code.h:143
GLint GLint GLsizei GLsizei GLsizei depth
Definition: SDL_opengl.h:1565
#define SDL_PREALLOC
Definition: SDL_surface.h:53

◆ SDL_FillRect()

int SDL_FillRect ( SDL_Surface dst,
const SDL_Rect rect,
Uint32  color 
)

Performs a fast fill of the given rectangle with color.

If rect is NULL, the whole surface will be filled with color.

The color should be a pixel of the format used by the surface, and can be generated by the SDL_MapRGB() function.

Returns
0 on success, or -1 on error.

Definition at line 237 of file SDL_fillrect.c.

References SDL_PixelFormat::BitsPerPixel, SDL_PixelFormat::BytesPerPixel, SDL_Surface::clip_rect, SDL_Surface::format, SDL_Rect::h, SDL_Surface::pitch, SDL_Surface::pixels, SDL_FillRect1(), SDL_FillRect2(), SDL_FillRect3(), SDL_FillRect4(), SDL_HasSSE, SDL_IntersectRect, SDL_RectEmpty(), SDL_SetError, SDL_Rect::w, SDL_Rect::x, and SDL_Rect::y.

Referenced by SDL_FillRects().

238 {
239  SDL_Rect clipped;
240  Uint8 *pixels;
241 
242  if (!dst) {
243  return SDL_SetError("Passed NULL destination surface");
244  }
245 
246  /* This function doesn't work on surfaces < 8 bpp */
247  if (dst->format->BitsPerPixel < 8) {
248  return SDL_SetError("SDL_FillRect(): Unsupported surface format");
249  }
250 
251  /* If 'rect' == NULL, then fill the whole surface */
252  if (rect) {
253  /* Perform clipping */
254  if (!SDL_IntersectRect(rect, &dst->clip_rect, &clipped)) {
255  return 0;
256  }
257  rect = &clipped;
258  } else {
259  rect = &dst->clip_rect;
260  /* Don't attempt to fill if the surface's clip_rect is empty */
261  if (SDL_RectEmpty(rect)) {
262  return 0;
263  }
264  }
265 
266  /* Perform software fill */
267  if (!dst->pixels) {
268  return SDL_SetError("SDL_FillRect(): You must lock the surface");
269  }
270 
271  pixels = (Uint8 *) dst->pixels + rect->y * dst->pitch +
272  rect->x * dst->format->BytesPerPixel;
273 
274  switch (dst->format->BytesPerPixel) {
275  case 1:
276  {
277  color |= (color << 8);
278  color |= (color << 16);
279 #ifdef __SSE__
280  if (SDL_HasSSE()) {
281  SDL_FillRect1SSE(pixels, dst->pitch, color, rect->w, rect->h);
282  break;
283  }
284 #endif
285  SDL_FillRect1(pixels, dst->pitch, color, rect->w, rect->h);
286  break;
287  }
288 
289  case 2:
290  {
291  color |= (color << 16);
292 #ifdef __SSE__
293  if (SDL_HasSSE()) {
294  SDL_FillRect2SSE(pixels, dst->pitch, color, rect->w, rect->h);
295  break;
296  }
297 #endif
298  SDL_FillRect2(pixels, dst->pitch, color, rect->w, rect->h);
299  break;
300  }
301 
302  case 3:
303  /* 24-bit RGB is a slow path, at least for now. */
304  {
305  SDL_FillRect3(pixels, dst->pitch, color, rect->w, rect->h);
306  break;
307  }
308 
309  case 4:
310  {
311 #ifdef __SSE__
312  if (SDL_HasSSE()) {
313  SDL_FillRect4SSE(pixels, dst->pitch, color, rect->w, rect->h);
314  break;
315  }
316 #endif
317  SDL_FillRect4(pixels, dst->pitch, color, rect->w, rect->h);
318  break;
319  }
320  }
321 
322  /* We're done! */
323  return 0;
324 }
Uint8 BytesPerPixel
Definition: SDL_pixels.h:318
GLint GLint GLsizei GLsizei GLsizei GLint GLenum GLenum const GLvoid * pixels
Definition: SDL_opengl.h:1565
#define SDL_IntersectRect
SDL_FORCE_INLINE SDL_bool SDL_RectEmpty(const SDL_Rect *r)
Returns true if the rectangle has no area.
Definition: SDL_rect.h:82
static void SDL_FillRect3(Uint8 *pixels, int pitch, Uint32 color, int w, int h)
Definition: SDL_fillrect.c:197
void * pixels
Definition: SDL_surface.h:75
uint8_t Uint8
An unsigned 8-bit integer type.
Definition: SDL_stdinc.h:143
Uint8 BitsPerPixel
Definition: SDL_pixels.h:317
int x
Definition: SDL_rect.h:66
int w
Definition: SDL_rect.h:67
SDL_Rect clip_rect
Definition: SDL_surface.h:85
SDL_PixelFormat * format
Definition: SDL_surface.h:72
#define SDL_SetError
static void SDL_FillRect2(Uint8 *pixels, int pitch, Uint32 color, int w, int h)
Definition: SDL_fillrect.c:173
int h
Definition: SDL_rect.h:67
GLuint color
static void SDL_FillRect4(Uint8 *pixels, int pitch, Uint32 color, int w, int h)
Definition: SDL_fillrect.c:225
static void SDL_FillRect1(Uint8 *pixels, int pitch, Uint32 color, int w, int h)
Definition: SDL_fillrect.c:134
#define SDL_HasSSE
int y
Definition: SDL_rect.h:66
A rectangle, with the origin at the upper left.
Definition: SDL_rect.h:64

◆ SDL_FillRects()

int SDL_FillRects ( SDL_Surface dst,
const SDL_Rect rects,
int  count,
Uint32  color 
)

Definition at line 327 of file SDL_fillrect.c.

References i, SDL_FillRect(), and SDL_SetError.

329 {
330  int i;
331  int status = 0;
332 
333  if (!rects) {
334  return SDL_SetError("SDL_FillRects() passed NULL rects");
335  }
336 
337  for (i = 0; i < count; ++i) {
338  status += SDL_FillRect(dst, &rects[i], color);
339  }
340  return status;
341 }
GLuint GLuint GLsizei count
Definition: SDL_opengl.h:1564
return Display return Display Bool Bool int int int return Display XEvent Bool(*) XPointer return Display return Display Drawable _Xconst char unsigned int unsigned int return Display Pixmap Pixmap XColor XColor unsigned int unsigned int return Display _Xconst char char int char return Display Visual unsigned int int int char unsigned int unsigned int in i)
Definition: SDL_x11sym.h:50
int SDL_FillRect(SDL_Surface *dst, const SDL_Rect *rect, Uint32 color)
Definition: SDL_fillrect.c:237
#define SDL_SetError
GLuint color

◆ SDL_FreeSurface()

void SDL_FreeSurface ( SDL_Surface surface)

Definition at line 1151 of file SDL_surface.c.

References SDL_Surface::flags, SDL_Surface::format, SDL_Surface::locked, SDL_Surface::map, NULL, SDL_Surface::pixels, SDL_Surface::refcount, SDL_DONTFREE, SDL_free(), SDL_FreeBlitMap(), SDL_FreeFormat, SDL_PREALLOC, SDL_RLEACCEL, SDL_SetSurfacePalette(), SDL_UnlockSurface(), and SDL_UnRLESurface().

Referenced by SDL_CreateRGBSurfaceWithFormat().

1152 {
1153  if (surface == NULL) {
1154  return;
1155  }
1156  if (surface->flags & SDL_DONTFREE) {
1157  return;
1158  }
1159  if (--surface->refcount > 0) {
1160  return;
1161  }
1162  while (surface->locked > 0) {
1163  SDL_UnlockSurface(surface);
1164  }
1165  if (surface->flags & SDL_RLEACCEL) {
1166  SDL_UnRLESurface(surface, 0);
1167  }
1168  if (surface->format) {
1169  SDL_SetSurfacePalette(surface, NULL);
1170  SDL_FreeFormat(surface->format);
1171  surface->format = NULL;
1172  }
1173  if (surface->map != NULL) {
1174  SDL_FreeBlitMap(surface->map);
1175  surface->map = NULL;
1176  }
1177  if (!(surface->flags & SDL_PREALLOC)) {
1178  SDL_free(surface->pixels);
1179  }
1180  SDL_free(surface);
1181 }
void SDL_UnlockSurface(SDL_Surface *surface)
Definition: SDL_surface.c:859
#define SDL_DONTFREE
Definition: SDL_surface.h:55
void SDL_UnRLESurface(SDL_Surface *surface, int recode)
Uint32 flags
Definition: SDL_surface.h:71
struct SDL_BlitMap * map
Definition: SDL_surface.h:88
void * pixels
Definition: SDL_surface.h:75
int SDL_SetSurfacePalette(SDL_Surface *surface, SDL_Palette *palette)
Set the palette used by a surface.
Definition: SDL_surface.c:177
void SDL_free(void *mem)
#define SDL_FreeFormat
#define NULL
Definition: begin_code.h:143
SDL_PixelFormat * format
Definition: SDL_surface.h:72
void SDL_FreeBlitMap(SDL_BlitMap *map)
Definition: SDL_pixels.c:1079
#define SDL_PREALLOC
Definition: SDL_surface.h:53
#define SDL_RLEACCEL
Definition: SDL_surface.h:54

◆ SDL_GetClipRect()

void SDL_GetClipRect ( SDL_Surface surface,
SDL_Rect rect 
)

Gets the clipping rectangle for the destination surface in a blit.

rect must be a pointer to a valid rectangle which will be filled with the correct values.

Definition at line 516 of file SDL_surface.c.

References SDL_Surface::clip_rect.

517 {
518  if (surface && rect) {
519  *rect = surface->clip_rect;
520  }
521 }
SDL_Rect clip_rect
Definition: SDL_surface.h:85

◆ SDL_GetColorKey()

int SDL_GetColorKey ( SDL_Surface surface,
Uint32 key 
)

Gets the color key (transparent pixel) in a blittable surface.

Parameters
surfaceThe surface to update
keyA pointer filled in with the transparent pixel in the native surface format
Returns
0 on success, or -1 if the surface is not valid or colorkey is not enabled.

Definition at line 257 of file SDL_surface.c.

References SDL_BlitInfo::colorkey, SDL_BlitInfo::flags, SDL_BlitMap::info, SDL_Surface::map, and SDL_COPY_COLORKEY.

258 {
259  if (!surface) {
260  return -1;
261  }
262 
263  if (!(surface->map->info.flags & SDL_COPY_COLORKEY)) {
264  return -1;
265  }
266 
267  if (key) {
268  *key = surface->map->info.colorkey;
269  }
270  return 0;
271 }
#define SDL_COPY_COLORKEY
Definition: SDL_blit.h:39
Uint32 colorkey
Definition: SDL_blit.h:69
struct SDL_BlitMap * map
Definition: SDL_surface.h:88
SDL_BlitInfo info
Definition: SDL_blit.h:91

◆ SDL_GetSurfaceAlphaMod()

int SDL_GetSurfaceAlphaMod ( SDL_Surface surface,
Uint8 alpha 
)

Get the additional alpha value used in blit operations.

Parameters
surfaceThe surface to query.
alphaA pointer filled in with the current alpha value.
Returns
0 on success, or -1 if the surface is not valid.
See also
SDL_SetSurfaceAlphaMod()

Definition at line 413 of file SDL_surface.c.

References SDL_BlitInfo::a, SDL_BlitMap::info, and SDL_Surface::map.

414 {
415  if (!surface) {
416  return -1;
417  }
418 
419  if (alpha) {
420  *alpha = surface->map->info.a;
421  }
422  return 0;
423 }
GLfloat GLfloat GLfloat alpha
struct SDL_BlitMap * map
Definition: SDL_surface.h:88
SDL_BlitInfo info
Definition: SDL_blit.h:91
Uint8 a
Definition: SDL_blit.h:70

◆ SDL_GetSurfaceBlendMode()

int SDL_GetSurfaceBlendMode ( SDL_Surface surface,
SDL_BlendMode blendMode 
)

Get the blend mode used for blit operations.

Parameters
surfaceThe surface to query.
blendModeA pointer filled in with the current blend mode.
Returns
0 on success, or -1 if the surface is not valid.
See also
SDL_SetSurfaceBlendMode()

Definition at line 463 of file SDL_surface.c.

References SDL_Surface::map, SDL_BLENDMODE_ADD, SDL_BLENDMODE_BLEND, SDL_BLENDMODE_MOD, SDL_BLENDMODE_NONE, SDL_COPY_ADD, SDL_COPY_BLEND, and SDL_COPY_MOD.

464 {
465  if (!surface) {
466  return -1;
467  }
468 
469  if (!blendMode) {
470  return 0;
471  }
472 
473  switch (surface->map->
474  info.flags & (SDL_COPY_BLEND | SDL_COPY_ADD | SDL_COPY_MOD)) {
475  case SDL_COPY_BLEND:
477  break;
478  case SDL_COPY_ADD:
480  break;
481  case SDL_COPY_MOD:
483  break;
484  default:
486  break;
487  }
488  return 0;
489 }
#define SDL_COPY_MOD
Definition: SDL_blit.h:38
#define SDL_COPY_ADD
Definition: SDL_blit.h:37
static SDL_BlendMode blendMode
Definition: testdraw2.c:34
struct SDL_BlitMap * map
Definition: SDL_surface.h:88
#define SDL_COPY_BLEND
Definition: SDL_blit.h:36

◆ SDL_GetSurfaceColorMod()

int SDL_GetSurfaceColorMod ( SDL_Surface surface,
Uint8 r,
Uint8 g,
Uint8 b 
)

Get the additional color value used in blit operations.

Parameters
surfaceThe surface to query.
rA pointer filled in with the current red color value.
gA pointer filled in with the current green color value.
bA pointer filled in with the current blue color value.
Returns
0 on success, or -1 if the surface is not valid.
See also
SDL_SetSurfaceColorMod()

Definition at line 371 of file SDL_surface.c.

References SDL_BlitInfo::b, SDL_BlitInfo::g, SDL_BlitMap::info, SDL_Surface::map, and SDL_BlitInfo::r.

372 {
373  if (!surface) {
374  return -1;
375  }
376 
377  if (r) {
378  *r = surface->map->info.r;
379  }
380  if (g) {
381  *g = surface->map->info.g;
382  }
383  if (b) {
384  *b = surface->map->info.b;
385  }
386  return 0;
387 }
Uint8 r
Definition: SDL_blit.h:70
Uint8 b
Definition: SDL_blit.h:70
GLdouble GLdouble GLdouble r
Definition: SDL_opengl.h:2072
Uint8 g
Definition: SDL_blit.h:70
GLboolean GLboolean g
struct SDL_BlitMap * map
Definition: SDL_surface.h:88
GLboolean GLboolean GLboolean b
SDL_BlitInfo info
Definition: SDL_blit.h:91

◆ SDL_LoadBMP_RW()

SDL_Surface* SDL_LoadBMP_RW ( SDL_RWops src,
int  freesrc 
)

Load a surface from a seekable SDL data stream (memory or file).

If freesrc is non-zero, the stream will be closed after being read.

The new surface should be freed with SDL_FreeSurface().

Returns
the new surface, or NULL if there was an error.

Definition at line 87 of file SDL_bmp.c.

References SDL_Color::a, SDL_Color::b, BI_BITFIELDS, BI_RGB, colors, SDL_Palette::colors, CorrectAlphaChannel(), done, SDL_Surface::format, SDL_Color::g, SDL_Surface::h, i, SDL_Palette::ncolors, NULL, SDL_Surface::pitch, SDL_Surface::pixels, SDL_Color::r, RW_SEEK_CUR, RW_SEEK_SET, SDL_ALPHA_OPAQUE, SDL_assert, SDL_ClearError, SDL_CreateRGBSurface, SDL_EFREAD, SDL_EFSEEK, SDL_Error, SDL_FALSE, SDL_FreeSurface, SDL_GetError, SDL_OutOfMemory, SDL_ReadLE16, SDL_ReadLE32, SDL_realloc, SDL_RWclose, SDL_RWread, SDL_RWseek, SDL_RWtell, SDL_SetError, SDL_strcmp, SDL_strncmp, SDL_Swap16(), SDL_Swap32(), SDL_TRUE, and SDL_Surface::w.

88 {
89  SDL_bool was_error;
90  Sint64 fp_offset = 0;
91  int bmpPitch;
92  int i, pad;
93  SDL_Surface *surface;
94  Uint32 Rmask = 0;
95  Uint32 Gmask = 0;
96  Uint32 Bmask = 0;
97  Uint32 Amask = 0;
98  SDL_Palette *palette;
99  Uint8 *bits;
100  Uint8 *top, *end;
101  SDL_bool topDown;
102  int ExpandBMP;
103  SDL_bool haveRGBMasks = SDL_FALSE;
104  SDL_bool haveAlphaMask = SDL_FALSE;
105  SDL_bool correctAlpha = SDL_FALSE;
106 
107  /* The Win32 BMP file header (14 bytes) */
108  char magic[2];
109  /* Uint32 bfSize = 0; */
110  /* Uint16 bfReserved1 = 0; */
111  /* Uint16 bfReserved2 = 0; */
112  Uint32 bfOffBits = 0;
113 
114  /* The Win32 BITMAPINFOHEADER struct (40 bytes) */
115  Uint32 biSize = 0;
116  Sint32 biWidth = 0;
117  Sint32 biHeight = 0;
118  /* Uint16 biPlanes = 0; */
119  Uint16 biBitCount = 0;
120  Uint32 biCompression = 0;
121  /* Uint32 biSizeImage = 0; */
122  /* Sint32 biXPelsPerMeter = 0; */
123  /* Sint32 biYPelsPerMeter = 0; */
124  Uint32 biClrUsed = 0;
125  /* Uint32 biClrImportant = 0; */
126 
127  /* Make sure we are passed a valid data source */
128  surface = NULL;
129  was_error = SDL_FALSE;
130  if (src == NULL) {
131  was_error = SDL_TRUE;
132  goto done;
133  }
134 
135  /* Read in the BMP file header */
136  fp_offset = SDL_RWtell(src);
137  SDL_ClearError();
138  if (SDL_RWread(src, magic, 1, 2) != 2) {
140  was_error = SDL_TRUE;
141  goto done;
142  }
143  if (SDL_strncmp(magic, "BM", 2) != 0) {
144  SDL_SetError("File is not a Windows BMP file");
145  was_error = SDL_TRUE;
146  goto done;
147  }
148  /* bfSize = */ SDL_ReadLE32(src);
149  /* bfReserved1 = */ SDL_ReadLE16(src);
150  /* bfReserved2 = */ SDL_ReadLE16(src);
151  bfOffBits = SDL_ReadLE32(src);
152 
153  /* Read the Win32 BITMAPINFOHEADER */
154  biSize = SDL_ReadLE32(src);
155  if (biSize == 12) { /* really old BITMAPCOREHEADER */
156  biWidth = (Uint32) SDL_ReadLE16(src);
157  biHeight = (Uint32) SDL_ReadLE16(src);
158  /* biPlanes = */ SDL_ReadLE16(src);
159  biBitCount = SDL_ReadLE16(src);
160  biCompression = BI_RGB;
161  } else if (biSize >= 40) { /* some version of BITMAPINFOHEADER */
162  Uint32 headerSize;
163  biWidth = SDL_ReadLE32(src);
164  biHeight = SDL_ReadLE32(src);
165  /* biPlanes = */ SDL_ReadLE16(src);
166  biBitCount = SDL_ReadLE16(src);
167  biCompression = SDL_ReadLE32(src);
168  /* biSizeImage = */ SDL_ReadLE32(src);
169  /* biXPelsPerMeter = */ SDL_ReadLE32(src);
170  /* biYPelsPerMeter = */ SDL_ReadLE32(src);
171  biClrUsed = SDL_ReadLE32(src);
172  /* biClrImportant = */ SDL_ReadLE32(src);
173 
174  /* 64 == BITMAPCOREHEADER2, an incompatible OS/2 2.x extension. Skip this stuff for now. */
175  if (biSize == 64) {
176  /* ignore these extra fields. */
177  if (biCompression == BI_BITFIELDS) {
178  /* this value is actually huffman compression in this variant. */
179  SDL_SetError("Compressed BMP files not supported");
180  was_error = SDL_TRUE;
181  goto done;
182  }
183  } else {
184  /* This is complicated. If compression is BI_BITFIELDS, then
185  we have 3 DWORDS that specify the RGB masks. This is either
186  stored here in an BITMAPV2INFOHEADER (which only differs in
187  that it adds these RGB masks) and biSize >= 52, or we've got
188  these masks stored in the exact same place, but strictly
189  speaking, this is the bmiColors field in BITMAPINFO immediately
190  following the legacy v1 info header, just past biSize. */
191  if (biCompression == BI_BITFIELDS) {
192  haveRGBMasks = SDL_TRUE;
193  Rmask = SDL_ReadLE32(src);
194  Gmask = SDL_ReadLE32(src);
195  Bmask = SDL_ReadLE32(src);
196 
197  /* ...v3 adds an alpha mask. */
198  if (biSize >= 56) { /* BITMAPV3INFOHEADER; adds alpha mask */
199  haveAlphaMask = SDL_TRUE;
200  Amask = SDL_ReadLE32(src);
201  }
202  } else {
203  /* the mask fields are ignored for v2+ headers if not BI_BITFIELD. */
204  if (biSize >= 52) { /* BITMAPV2INFOHEADER; adds RGB masks */
205  /*Rmask = */ SDL_ReadLE32(src);
206  /*Gmask = */ SDL_ReadLE32(src);
207  /*Bmask = */ SDL_ReadLE32(src);
208  }
209  if (biSize >= 56) { /* BITMAPV3INFOHEADER; adds alpha mask */
210  /*Amask = */ SDL_ReadLE32(src);
211  }
212  }
213 
214  /* Insert other fields here; Wikipedia and MSDN say we're up to
215  v5 of this header, but we ignore those for now (they add gamma,
216  color spaces, etc). Ignoring the weird OS/2 2.x format, we
217  currently parse up to v3 correctly (hopefully!). */
218  }
219 
220  /* skip any header bytes we didn't handle... */
221  headerSize = (Uint32) (SDL_RWtell(src) - (fp_offset + 14));
222  if (biSize > headerSize) {
223  SDL_RWseek(src, (biSize - headerSize), RW_SEEK_CUR);
224  }
225  }
226  if (biHeight < 0) {
227  topDown = SDL_TRUE;
228  biHeight = -biHeight;
229  } else {
230  topDown = SDL_FALSE;
231  }
232 
233  /* Check for read error */
234  if (SDL_strcmp(SDL_GetError(), "") != 0) {
235  was_error = SDL_TRUE;
236  goto done;
237  }
238 
239  /* Expand 1 and 4 bit bitmaps to 8 bits per pixel */
240  switch (biBitCount) {
241  case 1:
242  case 4:
243  ExpandBMP = biBitCount;
244  biBitCount = 8;
245  break;
246  default:
247  ExpandBMP = 0;
248  break;
249  }
250 
251  /* We don't support any BMP compression right now */
252  switch (biCompression) {
253  case BI_RGB:
254  /* If there are no masks, use the defaults */
255  SDL_assert(!haveRGBMasks);
256  SDL_assert(!haveAlphaMask);
257  /* Default values for the BMP format */
258  switch (biBitCount) {
259  case 15:
260  case 16:
261  Rmask = 0x7C00;
262  Gmask = 0x03E0;
263  Bmask = 0x001F;
264  break;
265  case 24:
266 #if SDL_BYTEORDER == SDL_BIG_ENDIAN
267  Rmask = 0x000000FF;
268  Gmask = 0x0000FF00;
269  Bmask = 0x00FF0000;
270 #else
271  Rmask = 0x00FF0000;
272  Gmask = 0x0000FF00;
273  Bmask = 0x000000FF;
274 #endif
275  break;
276  case 32:
277  /* We don't know if this has alpha channel or not */
278  correctAlpha = SDL_TRUE;
279  Amask = 0xFF000000;
280  Rmask = 0x00FF0000;
281  Gmask = 0x0000FF00;
282  Bmask = 0x000000FF;
283  break;
284  default:
285  break;
286  }
287  break;
288 
289  case BI_BITFIELDS:
290  break; /* we handled this in the info header. */
291 
292  default:
293  SDL_SetError("Compressed BMP files not supported");
294  was_error = SDL_TRUE;
295  goto done;
296  }
297 
298  /* Create a compatible surface, note that the colors are RGB ordered */
299  surface =
300  SDL_CreateRGBSurface(0, biWidth, biHeight, biBitCount, Rmask, Gmask,
301  Bmask, Amask);
302  if (surface == NULL) {
303  was_error = SDL_TRUE;
304  goto done;
305  }
306 
307  /* Load the palette, if any */
308  palette = (surface->format)->palette;
309  if (palette) {
310  SDL_assert(biBitCount <= 8);
311  if (biClrUsed == 0) {
312  biClrUsed = 1 << biBitCount;
313  }
314  if ((int) biClrUsed > palette->ncolors) {
315  SDL_Color *colors;
316  int ncolors = biClrUsed;
317  colors =
318  (SDL_Color *) SDL_realloc(palette->colors,
319  ncolors *
320  sizeof(*palette->colors));
321  if (!colors) {
322  SDL_OutOfMemory();
323  was_error = SDL_TRUE;
324  goto done;
325  }
326  palette->ncolors = ncolors;
327  palette->colors = colors;
328  } else if ((int) biClrUsed < palette->ncolors) {
329  palette->ncolors = biClrUsed;
330  }
331  if (biSize == 12) {
332  for (i = 0; i < (int) biClrUsed; ++i) {
333  SDL_RWread(src, &palette->colors[i].b, 1, 1);
334  SDL_RWread(src, &palette->colors[i].g, 1, 1);
335  SDL_RWread(src, &palette->colors[i].r, 1, 1);
336  palette->colors[i].a = SDL_ALPHA_OPAQUE;
337  }
338  } else {
339  for (i = 0; i < (int) biClrUsed; ++i) {
340  SDL_RWread(src, &palette->colors[i].b, 1, 1);
341  SDL_RWread(src, &palette->colors[i].g, 1, 1);
342  SDL_RWread(src, &palette->colors[i].r, 1, 1);
343  SDL_RWread(src, &palette->colors[i].a, 1, 1);
344 
345  /* According to Microsoft documentation, the fourth element
346  is reserved and must be zero, so we shouldn't treat it as
347  alpha.
348  */
349  palette->colors[i].a = SDL_ALPHA_OPAQUE;
350  }
351  }
352  }
353 
354  /* Read the surface pixels. Note that the bmp image is upside down */
355  if (SDL_RWseek(src, fp_offset + bfOffBits, RW_SEEK_SET) < 0) {
357  was_error = SDL_TRUE;
358  goto done;
359  }
360  top = (Uint8 *)surface->pixels;
361  end = (Uint8 *)surface->pixels+(surface->h*surface->pitch);
362  switch (ExpandBMP) {
363  case 1:
364  bmpPitch = (biWidth + 7) >> 3;
365  pad = (((bmpPitch) % 4) ? (4 - ((bmpPitch) % 4)) : 0);
366  break;
367  case 4:
368  bmpPitch = (biWidth + 1) >> 1;
369  pad = (((bmpPitch) % 4) ? (4 - ((bmpPitch) % 4)) : 0);
370  break;
371  default:
372  pad = ((surface->pitch % 4) ? (4 - (surface->pitch % 4)) : 0);
373  break;
374  }
375  if (topDown) {
376  bits = top;
377  } else {
378  bits = end - surface->pitch;
379  }
380  while (bits >= top && bits < end) {
381  switch (ExpandBMP) {
382  case 1:
383  case 4:{
384  Uint8 pixel = 0;
385  int shift = (8 - ExpandBMP);
386  for (i = 0; i < surface->w; ++i) {
387  if (i % (8 / ExpandBMP) == 0) {
388  if (!SDL_RWread(src, &pixel, 1, 1)) {
389  SDL_SetError("Error reading from BMP");
390  was_error = SDL_TRUE;
391  goto done;
392  }
393  }
394  *(bits + i) = (pixel >> shift);
395  pixel <<= ExpandBMP;
396  }
397  }
398  break;
399 
400  default:
401  if (SDL_RWread(src, bits, 1, surface->pitch)
402  != surface->pitch) {
404  was_error = SDL_TRUE;
405  goto done;
406  }
407 #if SDL_BYTEORDER == SDL_BIG_ENDIAN
408  /* Byte-swap the pixels if needed. Note that the 24bpp
409  case has already been taken care of above. */
410  switch (biBitCount) {
411  case 15:
412  case 16:{
413  Uint16 *pix = (Uint16 *) bits;
414  for (i = 0; i < surface->w; i++)
415  pix[i] = SDL_Swap16(pix[i]);
416  break;
417  }
418 
419  case 32:{
420  Uint32 *pix = (Uint32 *) bits;
421  for (i = 0; i < surface->w; i++)
422  pix[i] = SDL_Swap32(pix[i]);
423  break;
424  }
425  }
426 #endif
427  break;
428  }
429  /* Skip padding bytes, ugh */
430  if (pad) {
431  Uint8 padbyte;
432  for (i = 0; i < pad; ++i) {
433  SDL_RWread(src, &padbyte, 1, 1);
434  }
435  }
436  if (topDown) {
437  bits += surface->pitch;
438  } else {
439  bits -= surface->pitch;
440  }
441  }
442  if (correctAlpha) {
443  CorrectAlphaChannel(surface);
444  }
445  done:
446  if (was_error) {
447  if (src) {
448  SDL_RWseek(src, fp_offset, RW_SEEK_SET);
449  }
450  SDL_FreeSurface(surface);
451  surface = NULL;
452  }
453  if (freesrc && src) {
454  SDL_RWclose(src);
455  }
456  return (surface);
457 }
#define BI_RGB
Definition: SDL_bmp.c:45
#define SDL_ClearError
#define SDL_GetError
Uint8 g
Definition: SDL_pixels.h:296
GLuint GLuint end
Definition: SDL_opengl.h:1564
A collection of pixels used in software blitting.
Definition: SDL_surface.h:69
#define SDL_ReadLE32
#define SDL_RWread(ctx, ptr, size, n)
Definition: SDL_rwops.h:187
Uint8 b
Definition: SDL_pixels.h:297
GLenum GLint GLenum GLsizei GLsizei GLsizei GLint GLsizei const void * bits
uint32_t Uint32
An unsigned 32-bit integer type.
Definition: SDL_stdinc.h:159
#define SDL_realloc
static void CorrectAlphaChannel(SDL_Surface *surface)
Definition: SDL_bmp.c:57
GLdouble GLdouble GLdouble GLdouble top
#define SDL_strncmp
#define SDL_Error
#define SDL_RWseek(ctx, offset, whence)
Definition: SDL_rwops.h:185
#define SDL_ReadLE16
SDL_FORCE_INLINE Uint32 SDL_Swap32(Uint32 x)
Definition: SDL_endian.h:141
Uint8 r
Definition: SDL_pixels.h:295
void * pixels
Definition: SDL_surface.h:75
#define SDL_FreeSurface
Uint8 a
Definition: SDL_pixels.h:298
uint8_t Uint8
An unsigned 8-bit integer type.
Definition: SDL_stdinc.h:143
int done
Definition: checkkeys.c:28
SDL_FORCE_INLINE Uint16 SDL_Swap16(Uint16 x)
Definition: SDL_endian.h:101
int32_t Sint32
A signed 32-bit integer type.
Definition: SDL_stdinc.h:155
#define BI_BITFIELDS
Definition: SDL_bmp.c:48
return Display return Display Bool Bool int int int return Display XEvent Bool(*) XPointer return Display return Display Drawable _Xconst char unsigned int unsigned int return Display Pixmap Pixmap XColor XColor unsigned int unsigned int return Display _Xconst char char int char return Display Visual unsigned int int int char unsigned int unsigned int in i)
Definition: SDL_x11sym.h:50
#define SDL_assert(condition)
Definition: SDL_assert.h:167
#define NULL
Definition: begin_code.h:143
#define SDL_OutOfMemory()
Definition: SDL_error.h:52
SDL_bool
Definition: SDL_stdinc.h:130
SDL_Color * colors
Definition: SDL_pixels.h:305
SDL_PixelFormat * format
Definition: SDL_surface.h:72
#define SDL_RWclose(ctx)
Definition: SDL_rwops.h:189
#define SDL_SetError
#define SDL_CreateRGBSurface
#define RW_SEEK_SET
Definition: SDL_rwops.h:174
uint16_t Uint16
An unsigned 16-bit integer type.
Definition: SDL_stdinc.h:151
#define SDL_strcmp
#define RW_SEEK_CUR
Definition: SDL_rwops.h:175
int64_t Sint64
A signed 64-bit integer type.
Definition: SDL_stdinc.h:164
static int colors[7]
Definition: testgesture.c:40
#define SDL_ALPHA_OPAQUE
Definition: SDL_pixels.h:46
#define SDL_RWtell(ctx)
Definition: SDL_rwops.h:186

◆ SDL_LockSurface()

int SDL_LockSurface ( SDL_Surface surface)

Sets up a surface for directly accessing the pixels.

Between calls to SDL_LockSurface() / SDL_UnlockSurface(), you can write to and read from surface->pixels, using the pixel format stored in surface->format. Once you are done accessing the surface, you should use SDL_UnlockSurface() to release it.

Not all surfaces require locking. If SDL_MUSTLOCK(surface) evaluates to 0, then you can read and write to the surface at any time, and the pixel format of the surface will not change.

No operating system or library calls should be made between lock/unlock pairs, as critical system locks may be held during this time.

SDL_LockSurface() returns 0, or -1 if the surface couldn't be locked.

See also
SDL_UnlockSurface()

Definition at line 838 of file SDL_surface.c.

References SDL_Surface::flags, SDL_Surface::locked, SDL_RLEACCEL, and SDL_UnRLESurface().

Referenced by SDL_ConvertColorkeyToAlpha().

839 {
840  if (!surface->locked) {
841  /* Perform the lock */
842  if (surface->flags & SDL_RLEACCEL) {
843  SDL_UnRLESurface(surface, 1);
844  surface->flags |= SDL_RLEACCEL; /* save accel'd state */
845  }
846  }
847 
848  /* Increment the surface lock count, for recursive locks */
849  ++surface->locked;
850 
851  /* Ready to go.. */
852  return (0);
853 }
void SDL_UnRLESurface(SDL_Surface *surface, int recode)
Uint32 flags
Definition: SDL_surface.h:71
#define SDL_RLEACCEL
Definition: SDL_surface.h:54

◆ SDL_LowerBlit()

int SDL_LowerBlit ( SDL_Surface src,
SDL_Rect srcrect,
SDL_Surface dst,
SDL_Rect dstrect 
)

This is a semi-private blit function and it performs low-level surface blitting only.

Definition at line 535 of file SDL_surface.c.

References SDL_BlitMap::blit, SDL_BlitMap::dst, SDL_BlitMap::dst_palette_version, SDL_Surface::format, SDL_Surface::map, SDL_PixelFormat::palette, SDL_MapSurface(), SDL_BlitMap::src_palette_version, and SDL_Palette::version.

Referenced by SDL_ConvertPixels(), SDL_ConvertSurface(), SDL_LowerBlitScaled(), and SDL_UpperBlit().

537 {
538  /* Check to make sure the blit mapping is valid */
539  if ((src->map->dst != dst) ||
540  (dst->format->palette &&
541  src->map->dst_palette_version != dst->format->palette->version) ||
542  (src->format->palette &&
543  src->map->src_palette_version != src->format->palette->version)) {
544  if (SDL_MapSurface(src, dst) < 0) {
545  return (-1);
546  }
547  /* just here for debugging */
548 /* printf */
549 /* ("src = 0x%08X src->flags = %08X src->map->info.flags = %08x\ndst = 0x%08X dst->flags = %08X dst->map->info.flags = %08X\nsrc->map->blit = 0x%08x\n", */
550 /* src, dst->flags, src->map->info.flags, dst, dst->flags, */
551 /* dst->map->info.flags, src->map->blit); */
552  }
553  return (src->map->blit(src, srcrect, dst, dstrect));
554 }
Uint32 version
Definition: SDL_pixels.h:306
SDL_blit blit
Definition: SDL_blit.h:89
Uint32 dst_palette_version
Definition: SDL_blit.h:95
Uint32 src_palette_version
Definition: SDL_blit.h:96
struct SDL_BlitMap * map
Definition: SDL_surface.h:88
int SDL_MapSurface(SDL_Surface *src, SDL_Surface *dst)
Definition: SDL_pixels.c:993
SDL_Surface * dst
Definition: SDL_blit.h:87
SDL_PixelFormat * format
Definition: SDL_surface.h:72
SDL_Palette * palette
Definition: SDL_pixels.h:316

◆ SDL_LowerBlitScaled()

int SDL_LowerBlitScaled ( SDL_Surface src,
SDL_Rect srcrect,
SDL_Surface dst,
SDL_Rect dstrect 
)

This is a semi-private blit function and it performs low-level surface scaled blitting only.

Definition at line 811 of file SDL_surface.c.

References SDL_BlitInfo::flags, SDL_Surface::format, SDL_PixelFormat::format, SDL_BlitMap::info, SDL_Surface::map, SDL_COPY_ADD, SDL_COPY_BLEND, SDL_COPY_COLORKEY, SDL_COPY_MOD, SDL_COPY_MODULATE_ALPHA, SDL_COPY_MODULATE_COLOR, SDL_COPY_NEAREST, SDL_InvalidateMap(), SDL_ISPIXELFORMAT_INDEXED, SDL_LowerBlit(), and SDL_SoftStretch.

Referenced by SDL_UpperBlitScaled().

813 {
814  static const Uint32 complex_copy_flags = (
818  );
819 
820  if (!(src->map->info.flags & SDL_COPY_NEAREST)) {
821  src->map->info.flags |= SDL_COPY_NEAREST;
822  SDL_InvalidateMap(src->map);
823  }
824 
825  if ( !(src->map->info.flags & complex_copy_flags) &&
826  src->format->format == dst->format->format &&
828  return SDL_SoftStretch( src, srcrect, dst, dstrect );
829  } else {
830  return SDL_LowerBlit( src, srcrect, dst, dstrect );
831  }
832 }
#define SDL_COPY_MODULATE_COLOR
Definition: SDL_blit.h:34
#define SDL_COPY_COLORKEY
Definition: SDL_blit.h:39
#define SDL_SoftStretch
#define SDL_ISPIXELFORMAT_INDEXED(format)
Definition: SDL_pixels.h:134
#define SDL_COPY_MOD
Definition: SDL_blit.h:38
uint32_t Uint32
An unsigned 32-bit integer type.
Definition: SDL_stdinc.h:159
int SDL_LowerBlit(SDL_Surface *src, SDL_Rect *srcrect, SDL_Surface *dst, SDL_Rect *dstrect)
Definition: SDL_surface.c:535
#define SDL_COPY_ADD
Definition: SDL_blit.h:37
void SDL_InvalidateMap(SDL_BlitMap *map)
Definition: SDL_pixels.c:974
#define SDL_COPY_NEAREST
Definition: SDL_blit.h:40
struct SDL_BlitMap * map
Definition: SDL_surface.h:88
SDL_PixelFormat * format
Definition: SDL_surface.h:72
#define SDL_COPY_MODULATE_ALPHA
Definition: SDL_blit.h:35
#define SDL_COPY_BLEND
Definition: SDL_blit.h:36
SDL_BlitInfo info
Definition: SDL_blit.h:91

◆ SDL_SaveBMP_RW()

int SDL_SaveBMP_RW ( SDL_Surface surface,
SDL_RWops dst,
int  freedst 
)

Save a surface to a seekable SDL data stream (memory or file).

Surfaces with a 24-bit, 32-bit and paletted 8-bit format get saved in the BMP directly. Other RGB formats with 8-bit or higher get converted to a 24-bit surface or, if they have an alpha mask or a colorkey, to a 32-bit surface before they are saved. YUV and paletted 1-bit and 4-bit formats are not supported.

If freedst is non-zero, the stream will be closed after being written.

Returns
0 if successful or -1 if there was an error.

Definition at line 460 of file SDL_bmp.c.

References SDL_PixelFormat::Amask, BI_BITFIELDS, BI_RGB, SDL_PixelFormat::BitsPerPixel, SDL_PixelFormat::Bmask, SDL_PixelFormat::BytesPerPixel, colors, SDL_Palette::colors, SDL_BlitInfo::flags, SDL_Surface::format, SDL_PixelFormat::Gmask, SDL_Surface::h, i, SDL_BlitMap::info, LCS_WINDOWS_COLOR_SPACE, SDL_Surface::map, SDL_Palette::ncolors, NULL, SDL_PixelFormat::palette, SDL_Surface::pitch, SDL_Surface::pixels, SDL_PixelFormat::Rmask, RW_SEEK_SET, SDL_BYTEORDER, SDL_ClearError, SDL_ConvertSurface, SDL_COPY_COLORKEY, SDL_EFSEEK, SDL_EFWRITE, SDL_Error, SDL_FALSE, SDL_FreeSurface, SDL_GetError, SDL_GetHintBoolean, SDL_HINT_BMP_SAVE_LEGACY_FORMAT, SDL_InitFormat(), SDL_LIL_ENDIAN, SDL_LockSurface, SDL_PIXELFORMAT_BGR24, SDL_PIXELFORMAT_BGRA32, SDL_RWclose, SDL_RWseek, SDL_RWtell, SDL_RWwrite, SDL_SetError, SDL_strcmp, SDL_TRUE, SDL_UnlockSurface, SDL_WriteLE16, SDL_WriteLE32, and SDL_Surface::w.

461 {
462  Sint64 fp_offset;
463  int i, pad;
464  SDL_Surface *surface;
465  Uint8 *bits;
466  SDL_bool save32bit = SDL_FALSE;
467  SDL_bool saveLegacyBMP = SDL_FALSE;
468 
469  /* The Win32 BMP file header (14 bytes) */
470  char magic[2] = { 'B', 'M' };
471  Uint32 bfSize;
472  Uint16 bfReserved1;
473  Uint16 bfReserved2;
474  Uint32 bfOffBits;
475 
476  /* The Win32 BITMAPINFOHEADER struct (40 bytes) */
477  Uint32 biSize;
478  Sint32 biWidth;
479  Sint32 biHeight;
480  Uint16 biPlanes;
481  Uint16 biBitCount;
482  Uint32 biCompression;
483  Uint32 biSizeImage;
484  Sint32 biXPelsPerMeter;
485  Sint32 biYPelsPerMeter;
486  Uint32 biClrUsed;
487  Uint32 biClrImportant;
488 
489  /* The additional header members from the Win32 BITMAPV4HEADER struct (108 bytes in total) */
490  Uint32 bV4RedMask = 0;
491  Uint32 bV4GreenMask = 0;
492  Uint32 bV4BlueMask = 0;
493  Uint32 bV4AlphaMask = 0;
494  Uint32 bV4CSType = 0;
495  Sint32 bV4Endpoints[3 * 3] = {0};
496  Uint32 bV4GammaRed = 0;
497  Uint32 bV4GammaGreen = 0;
498  Uint32 bV4GammaBlue = 0;
499 
500  /* Make sure we have somewhere to save */
501  surface = NULL;
502  if (dst) {
503 #ifdef SAVE_32BIT_BMP
504  /* We can save alpha information in a 32-bit BMP */
505  if (saveme->format->BitsPerPixel >= 8 && (saveme->format->Amask ||
506  saveme->map->info.flags & SDL_COPY_COLORKEY)) {
507  save32bit = SDL_TRUE;
508  }
509 #endif /* SAVE_32BIT_BMP */
510 
511  if (saveme->format->palette && !save32bit) {
512  if (saveme->format->BitsPerPixel == 8) {
513  surface = saveme;
514  } else {
515  SDL_SetError("%d bpp BMP files not supported",
516  saveme->format->BitsPerPixel);
517  }
518  } else if ((saveme->format->BitsPerPixel == 24) && !save32bit &&
520  (saveme->format->Rmask == 0x00FF0000) &&
521  (saveme->format->Gmask == 0x0000FF00) &&
522  (saveme->format->Bmask == 0x000000FF)
523 #else
524  (saveme->format->Rmask == 0x000000FF) &&
525  (saveme->format->Gmask == 0x0000FF00) &&
526  (saveme->format->Bmask == 0x00FF0000)
527 #endif
528  ) {
529  surface = saveme;
530  } else {
532 
533  /* If the surface has a colorkey or alpha channel we'll save a
534  32-bit BMP with alpha channel, otherwise save a 24-bit BMP. */
535  if (save32bit) {
537  } else {
539  }
540  surface = SDL_ConvertSurface(saveme, &format, 0);
541  if (!surface) {
542  SDL_SetError("Couldn't convert image to %d bpp",
543  format.BitsPerPixel);
544  }
545  }
546  } else {
547  /* Set no error here because it may overwrite a more useful message from
548  SDL_RWFromFile() if SDL_SaveBMP_RW() is called from SDL_SaveBMP(). */
549  return -1;
550  }
551 
552  if (save32bit) {
554  }
555 
556  if (surface && (SDL_LockSurface(surface) == 0)) {
557  const int bw = surface->w * surface->format->BytesPerPixel;
558 
559  /* Set the BMP file header values */
560  bfSize = 0; /* We'll write this when we're done */
561  bfReserved1 = 0;
562  bfReserved2 = 0;
563  bfOffBits = 0; /* We'll write this when we're done */
564 
565  /* Write the BMP file header values */
566  fp_offset = SDL_RWtell(dst);
567  SDL_ClearError();
568  SDL_RWwrite(dst, magic, 2, 1);
569  SDL_WriteLE32(dst, bfSize);
570  SDL_WriteLE16(dst, bfReserved1);
571  SDL_WriteLE16(dst, bfReserved2);
572  SDL_WriteLE32(dst, bfOffBits);
573 
574  /* Set the BMP info values */
575  biSize = 40;
576  biWidth = surface->w;
577  biHeight = surface->h;
578  biPlanes = 1;
579  biBitCount = surface->format->BitsPerPixel;
580  biCompression = BI_RGB;
581  biSizeImage = surface->h * surface->pitch;
582  biXPelsPerMeter = 0;
583  biYPelsPerMeter = 0;
584  if (surface->format->palette) {
585  biClrUsed = surface->format->palette->ncolors;
586  } else {
587  biClrUsed = 0;
588  }
589  biClrImportant = 0;
590 
591  /* Set the BMP info values for the version 4 header */
592  if (save32bit && !saveLegacyBMP) {
593  biSize = 108;
594  biCompression = BI_BITFIELDS;
595  /* The BMP format is always little endian, these masks stay the same */
596  bV4RedMask = 0x00ff0000;
597  bV4GreenMask = 0x0000ff00;
598  bV4BlueMask = 0x000000ff;
599  bV4AlphaMask = 0xff000000;
600  bV4CSType = LCS_WINDOWS_COLOR_SPACE;
601  bV4GammaRed = 0;
602  bV4GammaGreen = 0;
603  bV4GammaBlue = 0;
604  }
605 
606  /* Write the BMP info values */
607  SDL_WriteLE32(dst, biSize);
608  SDL_WriteLE32(dst, biWidth);
609  SDL_WriteLE32(dst, biHeight);
610  SDL_WriteLE16(dst, biPlanes);
611  SDL_WriteLE16(dst, biBitCount);
612  SDL_WriteLE32(dst, biCompression);
613  SDL_WriteLE32(dst, biSizeImage);
614  SDL_WriteLE32(dst, biXPelsPerMeter);
615  SDL_WriteLE32(dst, biYPelsPerMeter);
616  SDL_WriteLE32(dst, biClrUsed);
617  SDL_WriteLE32(dst, biClrImportant);
618 
619  /* Write the BMP info values for the version 4 header */
620  if (save32bit && !saveLegacyBMP) {
621  SDL_WriteLE32(dst, bV4RedMask);
622  SDL_WriteLE32(dst, bV4GreenMask);
623  SDL_WriteLE32(dst, bV4BlueMask);
624  SDL_WriteLE32(dst, bV4AlphaMask);
625  SDL_WriteLE32(dst, bV4CSType);
626  for (i = 0; i < 3 * 3; i++) {
627  SDL_WriteLE32(dst, bV4Endpoints[i]);
628  }
629  SDL_WriteLE32(dst, bV4GammaRed);
630  SDL_WriteLE32(dst, bV4GammaGreen);
631  SDL_WriteLE32(dst, bV4GammaBlue);
632  }
633 
634  /* Write the palette (in BGR color order) */
635  if (surface->format->palette) {
636  SDL_Color *colors;
637  int ncolors;
638 
639  colors = surface->format->palette->colors;
640  ncolors = surface->format->palette->ncolors;
641  for (i = 0; i < ncolors; ++i) {
642  SDL_RWwrite(dst, &colors[i].b, 1, 1);
643  SDL_RWwrite(dst, &colors[i].g, 1, 1);
644  SDL_RWwrite(dst, &colors[i].r, 1, 1);
645  SDL_RWwrite(dst, &colors[i].a, 1, 1);
646  }
647  }
648 
649  /* Write the bitmap offset */
650  bfOffBits = (Uint32)(SDL_RWtell(dst) - fp_offset);
651  if (SDL_RWseek(dst, fp_offset + 10, RW_SEEK_SET) < 0) {
653  }
654  SDL_WriteLE32(dst, bfOffBits);
655  if (SDL_RWseek(dst, fp_offset + bfOffBits, RW_SEEK_SET) < 0) {
657  }
658 
659  /* Write the bitmap image upside down */
660  bits = (Uint8 *) surface->pixels + (surface->h * surface->pitch);
661  pad = ((bw % 4) ? (4 - (bw % 4)) : 0);
662  while (bits > (Uint8 *) surface->pixels) {
663  bits -= surface->pitch;
664  if (SDL_RWwrite(dst, bits, 1, bw) != bw) {
666  break;
667  }
668  if (pad) {
669  const Uint8 padbyte = 0;
670  for (i = 0; i < pad; ++i) {
671  SDL_RWwrite(dst, &padbyte, 1, 1);
672  }
673  }
674  }
675 
676  /* Write the BMP file size */
677  bfSize = (Uint32)(SDL_RWtell(dst) - fp_offset);
678  if (SDL_RWseek(dst, fp_offset + 2, RW_SEEK_SET) < 0) {
680  }
681  SDL_WriteLE32(dst, bfSize);
682  if (SDL_RWseek(dst, fp_offset + bfSize, RW_SEEK_SET) < 0) {
684  }
685 
686  /* Close it up.. */
687  SDL_UnlockSurface(surface);
688  if (surface != saveme) {
689  SDL_FreeSurface(surface);
690  }
691  }
692 
693  if (freedst && dst) {
694  SDL_RWclose(dst);
695  }
696  return ((SDL_strcmp(SDL_GetError(), "") == 0) ? 0 : -1);
697 }
#define BI_RGB
Definition: SDL_bmp.c:45
#define SDL_ClearError
GLint GLint GLsizei GLsizei GLsizei GLint GLenum format
Definition: SDL_opengl.h:1565
#define SDL_GetError
#define SDL_UnlockSurface
GLdouble GLdouble GLdouble r
Definition: SDL_opengl.h:2072
#define SDL_COPY_COLORKEY
Definition: SDL_blit.h:39
#define LCS_WINDOWS_COLOR_SPACE
Definition: SDL_bmp.c:54
#define SDL_RWwrite(ctx, ptr, size, n)
Definition: SDL_rwops.h:188
Uint8 BytesPerPixel
Definition: SDL_pixels.h:318
#define SDL_ConvertSurface
A collection of pixels used in software blitting.
Definition: SDL_surface.h:69
#define SDL_WriteLE16
#define SDL_LIL_ENDIAN
Definition: SDL_endian.h:37
GLenum GLint GLenum GLsizei GLsizei GLsizei GLint GLsizei const void * bits
uint32_t Uint32
An unsigned 32-bit integer type.
Definition: SDL_stdinc.h:159
#define SDL_Error
#define SDL_GetHintBoolean
#define SDL_RWseek(ctx, offset, whence)
Definition: SDL_rwops.h:185
GLboolean GLboolean g
void * pixels
Definition: SDL_surface.h:75
#define SDL_FreeSurface
uint8_t Uint8
An unsigned 8-bit integer type.
Definition: SDL_stdinc.h:143
Uint8 BitsPerPixel
Definition: SDL_pixels.h:317
#define SDL_HINT_BMP_SAVE_LEGACY_FORMAT
Prevent SDL from using version 4 of the bitmap header when saving BMPs.
Definition: SDL_hints.h:689
int32_t Sint32
A signed 32-bit integer type.
Definition: SDL_stdinc.h:155
int SDL_InitFormat(SDL_PixelFormat *format, Uint32 pixel_format)
Definition: SDL_pixels.c:521
#define BI_BITFIELDS
Definition: SDL_bmp.c:48
return Display return Display Bool Bool int int int return Display XEvent Bool(*) XPointer return Display return Display Drawable _Xconst char unsigned int unsigned int return Display Pixmap Pixmap XColor XColor unsigned int unsigned int return Display _Xconst char char int char return Display Visual unsigned int int int char unsigned int unsigned int in i)
Definition: SDL_x11sym.h:50
#define NULL
Definition: begin_code.h:143
SDL_bool
Definition: SDL_stdinc.h:130
SDL_Color * colors
Definition: SDL_pixels.h:305
SDL_PixelFormat * format
Definition: SDL_surface.h:72
#define SDL_RWclose(ctx)
Definition: SDL_rwops.h:189
#define SDL_SetError
#define SDL_LockSurface
#define SDL_WriteLE32
#define RW_SEEK_SET
Definition: SDL_rwops.h:174
uint16_t Uint16
An unsigned 16-bit integer type.
Definition: SDL_stdinc.h:151
SDL_Palette * palette
Definition: SDL_pixels.h:316
#define SDL_strcmp
int64_t Sint64
A signed 64-bit integer type.
Definition: SDL_stdinc.h:164
static int colors[7]
Definition: testgesture.c:40
GLboolean GLboolean GLboolean GLboolean a
GLboolean GLboolean GLboolean b
#define SDL_RWtell(ctx)
Definition: SDL_rwops.h:186
#define SDL_BYTEORDER

◆ SDL_SetClipRect()

SDL_bool SDL_SetClipRect ( SDL_Surface surface,
const SDL_Rect rect 
)

Sets the clipping rectangle for the destination surface in a blit.

If the clip rectangle is NULL, clipping will be disabled.

If the clip rectangle doesn't intersect the surface, the function will return SDL_FALSE and blits will be completely clipped. Otherwise the function returns SDL_TRUE and blits to the surface will be clipped to the intersection of the surface area and the clipping rectangle.

Note that blits are automatically clipped to the edges of the source and destination surfaces.

Definition at line 492 of file SDL_surface.c.

References SDL_Surface::clip_rect, SDL_Rect::h, SDL_Surface::h, SDL_FALSE, SDL_IntersectRect, SDL_TRUE, SDL_Rect::w, SDL_Surface::w, SDL_Rect::x, and SDL_Rect::y.

Referenced by SDL_ConvertSurface(), SDL_CreateRGBSurfaceFrom(), SDL_CreateRGBSurfaceWithFormat(), and SDL_CreateRGBSurfaceWithFormatFrom().

493 {
494  SDL_Rect full_rect;
495 
496  /* Don't do anything if there's no surface to act on */
497  if (!surface) {
498  return SDL_FALSE;
499  }
500 
501  /* Set up the full surface rectangle */
502  full_rect.x = 0;
503  full_rect.y = 0;
504  full_rect.w = surface->w;
505  full_rect.h = surface->h;
506 
507  /* Set the clipping rectangle */
508  if (!rect) {
509  surface->clip_rect = full_rect;
510  return SDL_TRUE;
511  }
512  return SDL_IntersectRect(rect, &full_rect, &surface->clip_rect);
513 }
#define SDL_IntersectRect
int x
Definition: SDL_rect.h:66
int w
Definition: SDL_rect.h:67
SDL_Rect clip_rect
Definition: SDL_surface.h:85
int h
Definition: SDL_rect.h:67
int y
Definition: SDL_rect.h:66
A rectangle, with the origin at the upper left.
Definition: SDL_rect.h:64

◆ SDL_SetColorKey()

int SDL_SetColorKey ( SDL_Surface surface,
int  flag,
Uint32  key 
)

Sets the color key (transparent pixel) in a blittable surface.

Parameters
surfaceThe surface to update
flagNon-zero to enable colorkey and 0 to disable colorkey
keyThe transparent pixel in the native surface format
Returns
0 on success, or -1 if the surface is not valid

You can pass SDL_RLEACCEL to enable RLE accelerated blits.

Definition at line 212 of file SDL_surface.c.

References SDL_Color::a, SDL_BlitInfo::colorkey, SDL_Palette::colors, SDL_BlitInfo::flags, SDL_Surface::format, SDL_BlitMap::info, SDL_Surface::map, SDL_Palette::ncolors, SDL_PixelFormat::palette, SDL_ALPHA_OPAQUE, SDL_ALPHA_TRANSPARENT, SDL_COPY_COLORKEY, SDL_InvalidateMap(), SDL_InvalidParamError, SDL_RLEACCEL, SDL_SetSurfaceRLE(), and SDL_Palette::version.

Referenced by SDL_ConvertColorkeyToAlpha(), and SDL_ConvertSurface().

213 {
214  int flags;
215 
216  if (!surface) {
217  return SDL_InvalidParamError("surface");
218  }
219 
220  if (surface->format->palette && key >= ((Uint32) surface->format->palette->ncolors)) {
221  return SDL_InvalidParamError("key");
222  }
223 
224  if (flag & SDL_RLEACCEL) {
225  SDL_SetSurfaceRLE(surface, 1);
226  }
227 
228  flags = surface->map->info.flags;
229  if (flag) {
230  surface->map->info.flags |= SDL_COPY_COLORKEY;
231  surface->map->info.colorkey = key;
232  if (surface->format->palette) {
233  surface->format->palette->colors[surface->map->info.colorkey].a = SDL_ALPHA_TRANSPARENT;
234  ++surface->format->palette->version;
235  if (!surface->format->palette->version) {
236  surface->format->palette->version = 1;
237  }
238  }
239  } else {
240  if (surface->format->palette) {
241  surface->format->palette->colors[surface->map->info.colorkey].a = SDL_ALPHA_OPAQUE;
242  ++surface->format->palette->version;
243  if (!surface->format->palette->version) {
244  surface->format->palette->version = 1;
245  }
246  }
247  surface->map->info.flags &= ~SDL_COPY_COLORKEY;
248  }
249  if (surface->map->info.flags != flags) {
250  SDL_InvalidateMap(surface->map);
251  }
252 
253  return 0;
254 }
Uint32 version
Definition: SDL_pixels.h:306
#define SDL_COPY_COLORKEY
Definition: SDL_blit.h:39
int SDL_SetSurfaceRLE(SDL_Surface *surface, int flag)
Sets the RLE acceleration hint for a surface.
Definition: SDL_surface.c:191
uint32_t Uint32
An unsigned 32-bit integer type.
Definition: SDL_stdinc.h:159
#define SDL_InvalidParamError(param)
Definition: SDL_error.h:54
Uint32 colorkey
Definition: SDL_blit.h:69
void SDL_InvalidateMap(SDL_BlitMap *map)
Definition: SDL_pixels.c:974
#define SDL_ALPHA_TRANSPARENT
Definition: SDL_pixels.h:47
struct SDL_BlitMap * map
Definition: SDL_surface.h:88
Uint8 a
Definition: SDL_pixels.h:298
SDL_Color * colors
Definition: SDL_pixels.h:305
SDL_PixelFormat * format
Definition: SDL_surface.h:72
GLbitfield flags
SDL_Palette * palette
Definition: SDL_pixels.h:316
#define SDL_ALPHA_OPAQUE
Definition: SDL_pixels.h:46
SDL_BlitInfo info
Definition: SDL_blit.h:91
#define SDL_RLEACCEL
Definition: SDL_surface.h:54

◆ SDL_SetSurfaceAlphaMod()

int SDL_SetSurfaceAlphaMod ( SDL_Surface surface,
Uint8  alpha 
)

Set an additional alpha value used in blit operations.

Parameters
surfaceThe surface to update.
alphaThe alpha value multiplied into blit operations.
Returns
0 on success, or -1 if the surface is not valid.
See also
SDL_GetSurfaceAlphaMod()

Definition at line 390 of file SDL_surface.c.

References SDL_BlitInfo::a, SDL_BlitInfo::flags, SDL_BlitMap::info, SDL_Surface::map, SDL_COPY_MODULATE_ALPHA, and SDL_InvalidateMap().

391 {
392  int flags;
393 
394  if (!surface) {
395  return -1;
396  }
397 
398  surface->map->info.a = alpha;
399 
400  flags = surface->map->info.flags;
401  if (alpha != 0xFF) {
402  surface->map->info.flags |= SDL_COPY_MODULATE_ALPHA;
403  } else {
404  surface->map->info.flags &= ~SDL_COPY_MODULATE_ALPHA;
405  }
406  if (surface->map->info.flags != flags) {
407  SDL_InvalidateMap(surface->map);
408  }
409  return 0;
410 }
GLfloat GLfloat GLfloat alpha
void SDL_InvalidateMap(SDL_BlitMap *map)
Definition: SDL_pixels.c:974
struct SDL_BlitMap * map
Definition: SDL_surface.h:88
#define SDL_COPY_MODULATE_ALPHA
Definition: SDL_blit.h:35
GLbitfield flags
SDL_BlitInfo info
Definition: SDL_blit.h:91
Uint8 a
Definition: SDL_blit.h:70

◆ SDL_SetSurfaceBlendMode()

int SDL_SetSurfaceBlendMode ( SDL_Surface surface,
SDL_BlendMode  blendMode 
)

Set the blend mode used for blit operations.

Parameters
surfaceThe surface to update.
blendModeSDL_BlendMode to use for blit blending.
Returns
0 on success, or -1 if the parameters are not valid.
See also
SDL_GetSurfaceBlendMode()

Definition at line 426 of file SDL_surface.c.

References SDL_BlitInfo::flags, SDL_BlitMap::info, SDL_Surface::map, SDL_BLENDMODE_ADD, SDL_BLENDMODE_BLEND, SDL_BLENDMODE_MOD, SDL_BLENDMODE_NONE, SDL_COPY_ADD, SDL_COPY_BLEND, SDL_COPY_MOD, SDL_InvalidateMap(), and SDL_Unsupported.

Referenced by SDL_ConvertColorkeyToAlpha(), SDL_ConvertSurface(), and SDL_CreateRGBSurfaceWithFormat().

427 {
428  int flags, status;
429 
430  if (!surface) {
431  return -1;
432  }
433 
434  status = 0;
435  flags = surface->map->info.flags;
436  surface->map->info.flags &=
438  switch (blendMode) {
439  case SDL_BLENDMODE_NONE:
440  break;
441  case SDL_BLENDMODE_BLEND:
442  surface->map->info.flags |= SDL_COPY_BLEND;
443  break;
444  case SDL_BLENDMODE_ADD:
445  surface->map->info.flags |= SDL_COPY_ADD;
446  break;
447  case SDL_BLENDMODE_MOD:
448  surface->map->info.flags |= SDL_COPY_MOD;
449  break;
450  default:
451  status = SDL_Unsupported();
452  break;
453  }
454 
455  if (surface->map->info.flags != flags) {
456  SDL_InvalidateMap(surface->map);
457  }
458 
459  return status;
460 }
#define SDL_COPY_MOD
Definition: SDL_blit.h:38
#define SDL_COPY_ADD
Definition: SDL_blit.h:37
static SDL_BlendMode blendMode
Definition: testdraw2.c:34
void SDL_InvalidateMap(SDL_BlitMap *map)
Definition: SDL_pixels.c:974
struct SDL_BlitMap * map
Definition: SDL_surface.h:88
GLbitfield flags
#define SDL_Unsupported()
Definition: SDL_error.h:53
#define SDL_COPY_BLEND
Definition: SDL_blit.h:36
SDL_BlitInfo info
Definition: SDL_blit.h:91

◆ SDL_SetSurfaceColorMod()

int SDL_SetSurfaceColorMod ( SDL_Surface surface,
Uint8  r,
Uint8  g,
Uint8  b 
)

Set an additional color value used in blit operations.

Parameters
surfaceThe surface to update.
rThe red color value multiplied into blit operations.
gThe green color value multiplied into blit operations.
bThe blue color value multiplied into blit operations.
Returns
0 on success, or -1 if the surface is not valid.
See also
SDL_GetSurfaceColorMod()

Definition at line 345 of file SDL_surface.c.

References SDL_BlitInfo::b, SDL_BlitInfo::flags, SDL_BlitInfo::g, SDL_BlitMap::info, SDL_Surface::map, SDL_BlitInfo::r, SDL_COPY_MODULATE_COLOR, and SDL_InvalidateMap().

346 {
347  int flags;
348 
349  if (!surface) {
350  return -1;
351  }
352 
353  surface->map->info.r = r;
354  surface->map->info.g = g;
355  surface->map->info.b = b;
356 
357  flags = surface->map->info.flags;
358  if (r != 0xFF || g != 0xFF || b != 0xFF) {
359  surface->map->info.flags |= SDL_COPY_MODULATE_COLOR;
360  } else {
361  surface->map->info.flags &= ~SDL_COPY_MODULATE_COLOR;
362  }
363  if (surface->map->info.flags != flags) {
364  SDL_InvalidateMap(surface->map);
365  }
366  return 0;
367 }
Uint8 r
Definition: SDL_blit.h:70
#define SDL_COPY_MODULATE_COLOR
Definition: SDL_blit.h:34
Uint8 b
Definition: SDL_blit.h:70
GLdouble GLdouble GLdouble r
Definition: SDL_opengl.h:2072
Uint8 g
Definition: SDL_blit.h:70
void SDL_InvalidateMap(SDL_BlitMap *map)
Definition: SDL_pixels.c:974
GLboolean GLboolean g
struct SDL_BlitMap * map
Definition: SDL_surface.h:88
GLbitfield flags
GLboolean GLboolean GLboolean b
SDL_BlitInfo info
Definition: SDL_blit.h:91

◆ SDL_SetSurfacePalette()

int SDL_SetSurfacePalette ( SDL_Surface surface,
SDL_Palette palette 
)

Set the palette used by a surface.

Returns
0, or -1 if the surface format doesn't use a palette.
Note
A single palette can be shared with many surfaces.

Definition at line 177 of file SDL_surface.c.

References SDL_Surface::format, SDL_Surface::map, SDL_InvalidateMap(), SDL_SetError, and SDL_SetPixelFormatPalette.

Referenced by SDL_CreateRGBSurfaceWithFormat(), and SDL_FreeSurface().

178 {
179  if (!surface) {
180  return SDL_SetError("SDL_SetSurfacePalette() passed a NULL surface");
181  }
182  if (SDL_SetPixelFormatPalette(surface->format, palette) < 0) {
183  return -1;
184  }
185  SDL_InvalidateMap(surface->map);
186 
187  return 0;
188 }
void SDL_InvalidateMap(SDL_BlitMap *map)
Definition: SDL_pixels.c:974
struct SDL_BlitMap * map
Definition: SDL_surface.h:88
SDL_PixelFormat * format
Definition: SDL_surface.h:72
#define SDL_SetError
#define SDL_SetPixelFormatPalette

◆ SDL_SetSurfaceRLE()

int SDL_SetSurfaceRLE ( SDL_Surface surface,
int  flag 
)

Sets the RLE acceleration hint for a surface.

Returns
0 on success, or -1 if the surface is not valid
Note
If RLE is enabled, colorkey and alpha blending blits are much faster, but the surface must be locked before directly accessing the pixels.

Definition at line 191 of file SDL_surface.c.

References SDL_BlitInfo::flags, SDL_BlitMap::info, SDL_Surface::map, SDL_COPY_RLE_DESIRED, and SDL_InvalidateMap().

Referenced by SDL_ConvertSurface(), and SDL_SetColorKey().

192 {
193  int flags;
194 
195  if (!surface) {
196  return -1;
197  }
198 
199  flags = surface->map->info.flags;
200  if (flag) {
201  surface->map->info.flags |= SDL_COPY_RLE_DESIRED;
202  } else {
203  surface->map->info.flags &= ~SDL_COPY_RLE_DESIRED;
204  }
205  if (surface->map->info.flags != flags) {
206  SDL_InvalidateMap(surface->map);
207  }
208  return 0;
209 }
#define SDL_COPY_RLE_DESIRED
Definition: SDL_blit.h:41
void SDL_InvalidateMap(SDL_BlitMap *map)
Definition: SDL_pixels.c:974
struct SDL_BlitMap * map
Definition: SDL_surface.h:88
GLbitfield flags
SDL_BlitInfo info
Definition: SDL_blit.h:91

◆ SDL_SoftStretch()

int SDL_SoftStretch ( SDL_Surface src,
const SDL_Rect srcrect,
SDL_Surface dst,
const SDL_Rect dstrect 
)

Perform a fast, low quality, stretch blit between two surfaces of the same pixel format.

Note
This function uses a static buffer, and is not thread-safe.

Definition at line 203 of file SDL_stretch.c.

References SDL_PixelFormat::BytesPerPixel, copy_row3(), SDL_Surface::format, SDL_PixelFormat::format, SDL_Rect::h, SDL_Surface::h, NULL, SDL_Surface::pitch, SDL_Surface::pixels, pop, SDL_FALSE, SDL_LockSurface, SDL_MUSTLOCK, SDL_SetError, SDL_TRUE, SDL_UnlockSurface, SDL_Rect::w, SDL_Surface::w, SDL_Rect::x, and SDL_Rect::y.

205 {
206  int src_locked;
207  int dst_locked;
208  int pos, inc;
209  int dst_maxrow;
210  int src_row, dst_row;
211  Uint8 *srcp = NULL;
212  Uint8 *dstp;
213  SDL_Rect full_src;
214  SDL_Rect full_dst;
215 #ifdef USE_ASM_STRETCH
216  SDL_bool use_asm = SDL_TRUE;
217 #ifdef __GNUC__
218  int u1, u2;
219 #endif
220 #endif /* USE_ASM_STRETCH */
221  const int bpp = dst->format->BytesPerPixel;
222 
223  if (src->format->format != dst->format->format) {
224  return SDL_SetError("Only works with same format surfaces");
225  }
226 
227  /* Verify the blit rectangles */
228  if (srcrect) {
229  if ((srcrect->x < 0) || (srcrect->y < 0) ||
230  ((srcrect->x + srcrect->w) > src->w) ||
231  ((srcrect->y + srcrect->h) > src->h)) {
232  return SDL_SetError("Invalid source blit rectangle");
233  }
234  } else {
235  full_src.x = 0;
236  full_src.y = 0;
237  full_src.w = src->w;
238  full_src.h = src->h;
239  srcrect = &full_src;
240  }
241  if (dstrect) {
242  if ((dstrect->x < 0) || (dstrect->y < 0) ||
243  ((dstrect->x + dstrect->w) > dst->w) ||
244  ((dstrect->y + dstrect->h) > dst->h)) {
245  return SDL_SetError("Invalid destination blit rectangle");
246  }
247  } else {
248  full_dst.x = 0;
249  full_dst.y = 0;
250  full_dst.w = dst->w;
251  full_dst.h = dst->h;
252  dstrect = &full_dst;
253  }
254 
255  /* Lock the destination if it's in hardware */
256  dst_locked = 0;
257  if (SDL_MUSTLOCK(dst)) {
258  if (SDL_LockSurface(dst) < 0) {
259  return SDL_SetError("Unable to lock destination surface");
260  }
261  dst_locked = 1;
262  }
263  /* Lock the source if it's in hardware */
264  src_locked = 0;
265  if (SDL_MUSTLOCK(src)) {
266  if (SDL_LockSurface(src) < 0) {
267  if (dst_locked) {
268  SDL_UnlockSurface(dst);
269  }
270  return SDL_SetError("Unable to lock source surface");
271  }
272  src_locked = 1;
273  }
274 
275  /* Set up the data... */
276  pos = 0x10000;
277  inc = (srcrect->h << 16) / dstrect->h;
278  src_row = srcrect->y;
279  dst_row = dstrect->y;
280 
281 #ifdef USE_ASM_STRETCH
282  /* Write the opcodes for this stretch */
283  if ((bpp == 3) || (generate_rowbytes(srcrect->w, dstrect->w, bpp) < 0)) {
284  use_asm = SDL_FALSE;
285  }
286 #endif
287 
288  /* Perform the stretch blit */
289  for (dst_maxrow = dst_row + dstrect->h; dst_row < dst_maxrow; ++dst_row) {
290  dstp = (Uint8 *) dst->pixels + (dst_row * dst->pitch)
291  + (dstrect->x * bpp);
292  while (pos >= 0x10000L) {
293  srcp = (Uint8 *) src->pixels + (src_row * src->pitch)
294  + (srcrect->x * bpp);
295  ++src_row;
296  pos -= 0x10000L;
297  }
298 #ifdef USE_ASM_STRETCH
299  if (use_asm) {
300 #ifdef __GNUC__
301  __asm__ __volatile__("call *%4":"=&D"(u1), "=&S"(u2)
302  :"0"(dstp), "1"(srcp), "r"(copy_row)
303  :"memory");
304 #elif defined(_MSC_VER) || defined(__WATCOMC__)
305  /* *INDENT-OFF* */
306  {
307  void *code = copy_row;
308  __asm {
309  push edi
310  push esi
311  mov edi, dstp
312  mov esi, srcp
313  call dword ptr code
314  pop esi
315  pop edi
316  }
317  }
318  /* *INDENT-ON* */
319 #else
320 #error Need inline assembly for this compiler
321 #endif
322  } else
323 #endif
324  switch (bpp) {
325  case 1:
326  copy_row1(srcp, srcrect->w, dstp, dstrect->w);
327  break;
328  case 2:
329  copy_row2((Uint16 *) srcp, srcrect->w,
330  (Uint16 *) dstp, dstrect->w);
331  break;
332  case 3:
333  copy_row3(srcp, srcrect->w, dstp, dstrect->w);
334  break;
335  case 4:
336  copy_row4((Uint32 *) srcp, srcrect->w,
337  (Uint32 *) dstp, dstrect->w);
338  break;
339  }
340  pos += inc;
341  }
342 
343  /* We need to unlock the surfaces if they're locked */
344  if (dst_locked) {
345  SDL_UnlockSurface(dst);
346  }
347  if (src_locked) {
348  SDL_UnlockSurface(src);
349  }
350  return (0);
351 }
#define SDL_UnlockSurface
Uint8 BytesPerPixel
Definition: SDL_pixels.h:318
GLfixed u1
uint32_t Uint32
An unsigned 32-bit integer type.
Definition: SDL_stdinc.h:159
static void copy_row3(Uint8 *src, int src_w, Uint8 *dst, int dst_w)
Definition: SDL_stretch.c:177
GLfixed GLfixed u2
void * pixels
Definition: SDL_surface.h:75
uint8_t Uint8
An unsigned 8-bit integer type.
Definition: SDL_stdinc.h:143
#define pop
Definition: SDL_qsort.c:192
int x
Definition: SDL_rect.h:66
int w
Definition: SDL_rect.h:67
#define NULL
Definition: begin_code.h:143
SDL_bool
Definition: SDL_stdinc.h:130
SDL_PixelFormat * format
Definition: SDL_surface.h:72
#define SDL_SetError
#define SDL_LockSurface
#define SDL_MUSTLOCK(S)
Definition: SDL_surface.h:61
int h
Definition: SDL_rect.h:67
uint16_t Uint16
An unsigned 16-bit integer type.
Definition: SDL_stdinc.h:151
int y
Definition: SDL_rect.h:66
A rectangle, with the origin at the upper left.
Definition: SDL_rect.h:64

◆ SDL_UnlockSurface()

void SDL_UnlockSurface ( SDL_Surface surface)
See also
SDL_LockSurface()

Definition at line 859 of file SDL_surface.c.

References SDL_Surface::flags, SDL_Surface::locked, SDL_RLEACCEL, and SDL_RLESurface().

Referenced by SDL_ConvertColorkeyToAlpha(), and SDL_FreeSurface().

860 {
861  /* Only perform an unlock if we are locked */
862  if (!surface->locked || (--surface->locked > 0)) {
863  return;
864  }
865 
866  /* Update RLE encoded surface with new data */
867  if ((surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL) {
868  surface->flags &= ~SDL_RLEACCEL; /* stop lying */
869  SDL_RLESurface(surface);
870  }
871 }
Uint32 flags
Definition: SDL_surface.h:71
int SDL_RLESurface(SDL_Surface *surface)
#define SDL_RLEACCEL
Definition: SDL_surface.h:54

◆ SDL_UpperBlit()

int SDL_UpperBlit ( SDL_Surface src,
const SDL_Rect srcrect,
SDL_Surface dst,
SDL_Rect dstrect 
)

This is the public blit function, SDL_BlitSurface(), and it performs rectangle validation and clipping before passing it to SDL_LowerBlit()

Definition at line 558 of file SDL_surface.c.

References SDL_Surface::clip_rect, SDL_BlitInfo::flags, SDL_Rect::h, SDL_Surface::h, SDL_BlitMap::info, SDL_Surface::locked, SDL_Surface::map, NULL, SDL_COPY_NEAREST, SDL_InvalidateMap(), SDL_LowerBlit(), SDL_SetError, SDL_Rect::w, SDL_Surface::w, SDL_Rect::x, and SDL_Rect::y.

560 {
561  SDL_Rect fulldst;
562  int srcx, srcy, w, h;
563 
564  /* Make sure the surfaces aren't locked */
565  if (!src || !dst) {
566  return SDL_SetError("SDL_UpperBlit: passed a NULL surface");
567  }
568  if (src->locked || dst->locked) {
569  return SDL_SetError("Surfaces must not be locked during blit");
570  }
571 
572  /* If the destination rectangle is NULL, use the entire dest surface */
573  if (dstrect == NULL) {
574  fulldst.x = fulldst.y = 0;
575  fulldst.w = dst->w;
576  fulldst.h = dst->h;
577  dstrect = &fulldst;
578  }
579 
580  /* clip the source rectangle to the source surface */
581  if (srcrect) {
582  int maxw, maxh;
583 
584  srcx = srcrect->x;
585  w = srcrect->w;
586  if (srcx < 0) {
587  w += srcx;
588  dstrect->x -= srcx;
589  srcx = 0;
590  }
591  maxw = src->w - srcx;
592  if (maxw < w)
593  w = maxw;
594 
595  srcy = srcrect->y;
596  h = srcrect->h;
597  if (srcy < 0) {
598  h += srcy;
599  dstrect->y -= srcy;
600  srcy = 0;
601  }
602  maxh = src->h - srcy;
603  if (maxh < h)
604  h = maxh;
605 
606  } else {
607  srcx = srcy = 0;
608  w = src->w;
609  h = src->h;
610  }
611 
612  /* clip the destination rectangle against the clip rectangle */
613  {
614  SDL_Rect *clip = &dst->clip_rect;
615  int dx, dy;
616 
617  dx = clip->x - dstrect->x;
618  if (dx > 0) {
619  w -= dx;
620  dstrect->x += dx;
621  srcx += dx;
622  }
623  dx = dstrect->x + w - clip->x - clip->w;
624  if (dx > 0)
625  w -= dx;
626 
627  dy = clip->y - dstrect->y;
628  if (dy > 0) {
629  h -= dy;
630  dstrect->y += dy;
631  srcy += dy;
632  }
633  dy = dstrect->y + h - clip->y - clip->h;
634  if (dy > 0)
635  h -= dy;
636  }
637 
638  /* Switch back to a fast blit if we were previously stretching */
639  if (src->map->info.flags & SDL_COPY_NEAREST) {
640  src->map->info.flags &= ~SDL_COPY_NEAREST;
641  SDL_InvalidateMap(src->map);
642  }
643 
644  if (w > 0 && h > 0) {
645  SDL_Rect sr;
646  sr.x = srcx;
647  sr.y = srcy;
648  sr.w = dstrect->w = w;
649  sr.h = dstrect->h = h;
650  return SDL_LowerBlit(src, &sr, dst, dstrect);
651  }
652  dstrect->w = dstrect->h = 0;
653  return 0;
654 }
int SDL_LowerBlit(SDL_Surface *src, SDL_Rect *srcrect, SDL_Surface *dst, SDL_Rect *dstrect)
Definition: SDL_surface.c:535
void SDL_InvalidateMap(SDL_BlitMap *map)
Definition: SDL_pixels.c:974
#define SDL_COPY_NEAREST
Definition: SDL_blit.h:40
struct SDL_BlitMap * map
Definition: SDL_surface.h:88
int x
Definition: SDL_rect.h:66
int w
Definition: SDL_rect.h:67
SDL_Rect clip_rect
Definition: SDL_surface.h:85
#define NULL
Definition: begin_code.h:143
#define SDL_SetError
int h
Definition: SDL_rect.h:67
GLubyte GLubyte GLubyte GLubyte w
int y
Definition: SDL_rect.h:66
GLfloat GLfloat GLfloat GLfloat h
SDL_BlitInfo info
Definition: SDL_blit.h:91
A rectangle, with the origin at the upper left.
Definition: SDL_rect.h:64

◆ SDL_UpperBlitScaled()

int SDL_UpperBlitScaled ( SDL_Surface src,
const SDL_Rect srcrect,
SDL_Surface dst,
SDL_Rect dstrect 
)

This is the public scaled blit function, SDL_BlitScaled(), and it performs rectangle validation and clipping before passing it to SDL_LowerBlitScaled()

Definition at line 657 of file SDL_surface.c.

References SDL_Surface::clip_rect, SDL_Rect::h, SDL_Surface::h, SDL_Surface::locked, NULL, SDL_BlitSurface, SDL_floor, SDL_LowerBlitScaled(), SDL_SetError, SDL_Rect::w, SDL_Surface::w, SDL_Rect::x, and SDL_Rect::y.

659 {
660  double src_x0, src_y0, src_x1, src_y1;
661  double dst_x0, dst_y0, dst_x1, dst_y1;
662  SDL_Rect final_src, final_dst;
663  double scaling_w, scaling_h;
664  int src_w, src_h;
665  int dst_w, dst_h;
666 
667  /* Make sure the surfaces aren't locked */
668  if (!src || !dst) {
669  return SDL_SetError("SDL_UpperBlitScaled: passed a NULL surface");
670  }
671  if (src->locked || dst->locked) {
672  return SDL_SetError("Surfaces must not be locked during blit");
673  }
674 
675  if (NULL == srcrect) {
676  src_w = src->w;
677  src_h = src->h;
678  } else {
679  src_w = srcrect->w;
680  src_h = srcrect->h;
681  }
682 
683  if (NULL == dstrect) {
684  dst_w = dst->w;
685  dst_h = dst->h;
686  } else {
687  dst_w = dstrect->w;
688  dst_h = dstrect->h;
689  }
690 
691  if (dst_w == src_w && dst_h == src_h) {
692  /* No scaling, defer to regular blit */
693  return SDL_BlitSurface(src, srcrect, dst, dstrect);
694  }
695 
696  scaling_w = (double)dst_w / src_w;
697  scaling_h = (double)dst_h / src_h;
698 
699  if (NULL == dstrect) {
700  dst_x0 = 0;
701  dst_y0 = 0;
702  dst_x1 = dst_w - 1;
703  dst_y1 = dst_h - 1;
704  } else {
705  dst_x0 = dstrect->x;
706  dst_y0 = dstrect->y;
707  dst_x1 = dst_x0 + dst_w - 1;
708  dst_y1 = dst_y0 + dst_h - 1;
709  }
710 
711  if (NULL == srcrect) {
712  src_x0 = 0;
713  src_y0 = 0;
714  src_x1 = src_w - 1;
715  src_y1 = src_h - 1;
716  } else {
717  src_x0 = srcrect->x;
718  src_y0 = srcrect->y;
719  src_x1 = src_x0 + src_w - 1;
720  src_y1 = src_y0 + src_h - 1;
721 
722  /* Clip source rectangle to the source surface */
723 
724  if (src_x0 < 0) {
725  dst_x0 -= src_x0 * scaling_w;
726  src_x0 = 0;
727  }
728 
729  if (src_x1 >= src->w) {
730  dst_x1 -= (src_x1 - src->w + 1) * scaling_w;
731  src_x1 = src->w - 1;
732  }
733 
734  if (src_y0 < 0) {
735  dst_y0 -= src_y0 * scaling_h;
736  src_y0 = 0;
737  }
738 
739  if (src_y1 >= src->h) {
740  dst_y1 -= (src_y1 - src->h + 1) * scaling_h;
741  src_y1 = src->h - 1;
742  }
743  }
744 
745  /* Clip destination rectangle to the clip rectangle */
746 
747  /* Translate to clip space for easier calculations */
748  dst_x0 -= dst->clip_rect.x;
749  dst_x1 -= dst->clip_rect.x;
750  dst_y0 -= dst->clip_rect.y;
751  dst_y1 -= dst->clip_rect.y;
752 
753  if (dst_x0 < 0) {
754  src_x0 -= dst_x0 / scaling_w;
755  dst_x0 = 0;
756  }
757 
758  if (dst_x1 >= dst->clip_rect.w) {
759  src_x1 -= (dst_x1 - dst->clip_rect.w + 1) / scaling_w;
760  dst_x1 = dst->clip_rect.w - 1;
761  }
762 
763  if (dst_y0 < 0) {
764  src_y0 -= dst_y0 / scaling_h;
765  dst_y0 = 0;
766  }
767 
768  if (dst_y1 >= dst->clip_rect.h) {
769  src_y1 -= (dst_y1 - dst->clip_rect.h + 1) / scaling_h;
770  dst_y1 = dst->clip_rect.h - 1;
771  }
772 
773  /* Translate back to surface coordinates */
774  dst_x0 += dst->clip_rect.x;
775  dst_x1 += dst->clip_rect.x;
776  dst_y0 += dst->clip_rect.y;
777  dst_y1 += dst->clip_rect.y;
778 
779  final_src.x = (int)SDL_floor(src_x0 + 0.5);
780  final_src.y = (int)SDL_floor(src_y0 + 0.5);
781  final_src.w = (int)SDL_floor(src_x1 - src_x0 + 1.5);
782  final_src.h = (int)SDL_floor(src_y1 - src_y0 + 1.5);
783 
784  final_dst.x = (int)SDL_floor(dst_x0 + 0.5);
785  final_dst.y = (int)SDL_floor(dst_y0 + 0.5);
786  final_dst.w = (int)SDL_floor(dst_x1 - dst_x0 + 1.5);
787  final_dst.h = (int)SDL_floor(dst_y1 - dst_y0 + 1.5);
788 
789  if (final_dst.w < 0)
790  final_dst.w = 0;
791  if (final_dst.h < 0)
792  final_dst.h = 0;
793 
794  if (dstrect)
795  *dstrect = final_dst;
796 
797  if (final_dst.w == 0 || final_dst.h == 0 ||
798  final_src.w <= 0 || final_src.h <= 0) {
799  /* No-op. */
800  return 0;
801  }
802 
803  return SDL_LowerBlitScaled(src, &final_src, dst, &final_dst);
804 }
#define SDL_BlitSurface
Definition: SDL_surface.h:457
#define SDL_floor
int x
Definition: SDL_rect.h:66
int w
Definition: SDL_rect.h:67
SDL_Rect clip_rect
Definition: SDL_surface.h:85
#define NULL
Definition: begin_code.h:143
#define SDL_SetError
int h
Definition: SDL_rect.h:67
int SDL_LowerBlitScaled(SDL_Surface *src, SDL_Rect *srcrect, SDL_Surface *dst, SDL_Rect *dstrect)
Definition: SDL_surface.c:811
int y
Definition: SDL_rect.h:66
A rectangle, with the origin at the upper left.
Definition: SDL_rect.h:64