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- simplication and factorization around CalculateSize and Pitch, RGB/YUV 

- update SDL_CalculateYUVSize pitch to size_t
This commit is contained in:
Sylvain 2023-03-30 11:30:11 +02:00 committed by Sylvain Becker
parent c82cca0494
commit cae6b4489d
4 changed files with 67 additions and 62 deletions
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1
src/video/SDL_pixels_c.h
View File

@ -30,6 +30,7 @@
/* Pixel format functions */
extern int SDL_InitFormat(SDL_PixelFormat *format, Uint32 pixel_format);
extern int SDL_CalculateSize(Uint32 format, int width, int height, size_t *size, size_t *pitch, SDL_bool minimalPitch);
/* Blit mapping functions */
extern SDL_BlitMap *SDL_AllocBlitMap(void);

122
src/video/SDL_surface.c
View File

@ -42,32 +42,71 @@ SDL_COMPILE_TIME_ASSERT(can_indicate_overflow, SDL_SIZE_MAX > SDL_MAX_SINT32);
*
* for FOURCC, use SDL_CalculateYUVSize()
*/
static size_t
SDL_CalculatePitch(Uint32 format, size_t width, SDL_bool minimal)
static int
SDL_CalculateRGBSize(Uint32 format, size_t width, size_t height, size_t *size, size_t *pitch, SDL_bool minimal)
{
size_t pitch;
if (SDL_BITSPERPIXEL(format) >= 8) {
if (SDL_size_mul_overflow(width, SDL_BYTESPERPIXEL(format), &pitch)) {
return SDL_SIZE_MAX;
if (SDL_size_mul_overflow(width, SDL_BYTESPERPIXEL(format), pitch)) {
return -1;
}
} else {
if (SDL_size_mul_overflow(width, SDL_BITSPERPIXEL(format), &pitch)) {
return SDL_SIZE_MAX;
if (SDL_size_mul_overflow(width, SDL_BITSPERPIXEL(format), pitch)) {
return -1;
}
if (SDL_size_add_overflow(pitch, 7, &pitch)) {
return SDL_SIZE_MAX;
if (SDL_size_add_overflow(*pitch, 7, pitch)) {
return -1;
}
pitch /= 8;
*pitch /= 8;
}
if (!minimal) {
/* 4-byte aligning for speed */
if (SDL_size_add_overflow(pitch, 3, &pitch)) {
return SDL_SIZE_MAX;
if (SDL_size_add_overflow(*pitch, 3, pitch)) {
return -1;
}
pitch &= ~3;
*pitch &= ~3;
}
return pitch;
if (SDL_size_mul_overflow(height, *pitch, size)) {
/* Overflow... */
return -1;
}
return 0;
}
int SDL_CalculateSize(Uint32 format, int width, int height, size_t *size, size_t *pitch, SDL_bool minimalPitch)
{
size_t p = 0, sz = 0;
if (size) {
*size = 0;
}
if (pitch) {
*pitch = 0;
}
if (SDL_ISPIXELFORMAT_FOURCC(format)) {
if (SDL_CalculateYUVSize(format, width, height, &sz, &p) < 0) {
/* Overflow... */
return -1;
}
} else {
if (SDL_CalculateRGBSize(format, width, height, &sz, &p, minimalPitch) < 0) {
/* Overflow... */
return -1;
}
}
if (size) {
*size = sz;
}
if (pitch) {
*pitch = p;
}
return 0;
}
/*
@ -77,7 +116,7 @@ SDL_CalculatePitch(Uint32 format, size_t width, SDL_bool minimal)
SDL_Surface *
SDL_CreateSurface(int width, int height, Uint32 format)
{
size_t pitch;
size_t pitch, size;
SDL_Surface *surface;
if (width < 0) {
@ -90,21 +129,10 @@ SDL_CreateSurface(int width, int height, Uint32 format)
return NULL;
}
if (SDL_ISPIXELFORMAT_FOURCC(format)) {
int p;
if (SDL_CalculateYUVSize(format, width, height, NULL, &p) < 0) {
/* Overflow... */
SDL_OutOfMemory();
return NULL;
}
pitch = p;
} else {
pitch = SDL_CalculatePitch(format, width, SDL_FALSE);
if (pitch > SDL_MAX_SINT32) {
/* Overflow... */
SDL_OutOfMemory();
return NULL;
}
if (SDL_CalculateSize(format, width, height, &size, &pitch, SDL_FALSE /* not minimal pitch */) < 0) {
/* Overflow... */
SDL_OutOfMemory();
return NULL;
}
/* Allocate the surface */
@ -146,25 +174,6 @@ SDL_CreateSurface(int width, int height, Uint32 format)
/* Get the pixels */
if (surface->w && surface->h) {
size_t size;
if (SDL_ISPIXELFORMAT_FOURCC(surface->format->format)) {
/* Get correct size and pitch for YUV formats */
if (SDL_CalculateYUVSize(surface->format->format, surface->w, surface->h, &size, &surface->pitch) < 0) {
/* Overflow... */
SDL_DestroySurface(surface);
SDL_OutOfMemory();
return NULL;
}
} else {
/* Assumptions checked in surface_size_assumptions assert above */
if (SDL_size_mul_overflow(surface->h, surface->pitch, &size)) {
/* Overflow... */
SDL_DestroySurface(surface);
SDL_OutOfMemory();
return NULL;
}
}
surface->pixels = SDL_aligned_alloc(SDL_SIMDGetAlignment(), size);
if (!surface->pixels) {
SDL_DestroySurface(surface);
@ -219,15 +228,10 @@ SDL_CreateSurfaceFrom(void *pixels,
} else {
size_t minimalPitch;
if (SDL_ISPIXELFORMAT_FOURCC(format)) {
int p;
if (SDL_CalculateYUVSize(format, width, height, NULL, &p) < 0) {
SDL_InvalidParamError("pitch");
return NULL;
}
minimalPitch = p;
} else {
minimalPitch = SDL_CalculatePitch(format, width, SDL_TRUE);
if (SDL_CalculateSize(format, width, height, NULL, &minimalPitch, SDL_TRUE /* minimal pitch */) < 0) {
/* Overflow... */
SDL_OutOfMemory();
return NULL;
}
if (pitch < 0 || (size_t)pitch < minimalPitch) {

4
src/video/SDL_yuv.c
View File

@ -62,7 +62,7 @@ SDL_YUV_CONVERSION_MODE SDL_GetYUVConversionModeForResolution(int width, int hei
*
* return 0 on success, -1 on error
*/
int SDL_CalculateYUVSize(Uint32 format, int w, int h, size_t *size, int *pitch)
int SDL_CalculateYUVSize(Uint32 format, int w, int h, size_t *size, size_t *pitch)
{
#if SDL_HAVE_YUV
int sz_plane = 0, sz_plane_chroma = 0, sz_plane_packed = 0;
@ -141,7 +141,7 @@ int SDL_CalculateYUVSize(Uint32 format, int w, int h, size_t *size, int *pitch)
if (SDL_size_mul_overflow(p1, 4, &p2) < 0) {
return -1;
}
*pitch = (int) p2;
*pitch = p2;
}
if (size) {

2
src/video/SDL_yuv_c.h
View File

@ -31,6 +31,6 @@ extern int SDL_ConvertPixels_RGB_to_YUV(int width, int height, Uint32 src_format
extern int SDL_ConvertPixels_YUV_to_YUV(int width, int height, Uint32 src_format, const void *src, int src_pitch, Uint32 dst_format, void *dst, int dst_pitch);
extern int SDL_CalculateYUVSize(Uint32 format, int w, int h, size_t *size, int *pitch);
extern int SDL_CalculateYUVSize(Uint32 format, int w, int h, size_t *size, size_t *pitch);
#endif /* SDL_yuv_c_h_ */