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You can specify the format for pixel data in SDL_RenderReadPixels() and SDL_RenderWritePixels()

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This code still doesn't quite work yet. :)

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%404174
This commit is contained in:
Sam Lantinga 2009-11-16 07:13:07 +00:00
parent ea4fb3a1a4
commit 0f620b7fe4
7 changed files with 82 additions and 50 deletions
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54
src/video/SDL_renderer_gl.c
View file

@ -103,9 +103,9 @@ static int GL_RenderFill(SDL_Renderer * renderer, const SDL_Rect * rect);
static int GL_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture,
const SDL_Rect * srcrect, const SDL_Rect * dstrect);
static int GL_RenderReadPixels(SDL_Renderer * renderer, const SDL_Rect * rect,
void * pixels, int pitch);
Uint32 pixel_format, void * pixels, int pitch);
static int GL_RenderWritePixels(SDL_Renderer * renderer, const SDL_Rect * rect,
const void * pixels, int pitch);
Uint32 pixel_format, const void * pixels, int pitch);
static void GL_RenderPresent(SDL_Renderer * renderer);
static void GL_DestroyTexture(SDL_Renderer * renderer, SDL_Texture * texture);
static void GL_DestroyRenderer(SDL_Renderer * renderer);
@ -1254,16 +1254,16 @@ GL_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture,
static int
GL_RenderReadPixels(SDL_Renderer * renderer, const SDL_Rect * rect,
void * pixels, int pitch)
Uint32 pixel_format, void * pixels, int pitch)
{
GL_RenderData *data = (GL_RenderData *) renderer->driverdata;
SDL_Window *window = SDL_GetWindowFromID(renderer->window);
SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);
Uint32 pixel_format = display->current_mode.format;
GLint internalFormat;
GLenum format, type;
Uint8 *src, *dst, *tmp;
int length, rows;
if (!convert_format(data, pixel_format, &internalFormat, &format, &type)) {
/* FIXME: Do a temp copy to a format that is supported */
SDL_SetError("Unsupported pixel format");
return -1;
}
@ -1275,16 +1275,52 @@ GL_RenderReadPixels(SDL_Renderer * renderer, const SDL_Rect * rect,
}
data->glPixelStorei(GL_PACK_ALIGNMENT, 1);
data->glPixelStorei(GL_PACK_ROW_LENGTH,
-2 * (pitch / bytes_per_pixel(pixel_format)));
(pitch / bytes_per_pixel(pixel_format)));
data->glReadPixels(rect->x, rect->y+rect->h-1, rect->w, rect->h,
format, type, pixels + (rect->h-1)*pitch);
format, type, pixels);
/* Flip the rows to be top-down */
length = rect->w * bytes_per_pixel(pixel_format);
src = (Uint8*)pixels + (rect->h-1)*pitch;
dst = (Uint8*)pixels;
tmp = SDL_stack_alloc(Uint8, length);
rows = rect->h / 2;
while (rows--) {
SDL_memcpy(tmp, dst, length);
SDL_memcpy(dst, src, length);
SDL_memcpy(src, tmp, length);
}
SDL_stack_free(tmp);
}
static int
GL_RenderWritePixels(SDL_Renderer * renderer, const SDL_Rect * rect,
const void * pixels, int pitch)
Uint32 pixel_format, const void * pixels, int pitch)
{
GL_RenderData *data = (GL_RenderData *) renderer->driverdata;
GLint internalFormat;
GLenum format, type;
if (!convert_format(data, pixel_format, &internalFormat, &format, &type)) {
/* FIXME: Do a temp copy to a format that is supported */
SDL_SetError("Unsupported pixel format");
return -1;
}
/* FIXME: We need to copy the data and flip it */
if (pixel_format == SDL_PIXELFORMAT_INDEX1LSB) {
data->glPixelStorei(GL_UNPACK_LSB_FIRST, 1);
} else if (pixel_format == SDL_PIXELFORMAT_INDEX1MSB) {
data->glPixelStorei(GL_UNPACK_LSB_FIRST, 0);
}
data->glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
data->glPixelStorei(GL_UNPACK_ROW_LENGTH,
(pitch / bytes_per_pixel(pixel_format)));
data->glReadPixels(rect->x, rect->y+rect->h-1, rect->w, rect->h,
format, type, pixels);
}
static void