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Fixed bug #2140: basic support to convert 16 colors palette PIXELFORMAT_INDEX4, to allow conversion to SDL_Texture

This commit is contained in:
Sylvain 2022-02-10 13:44:59 +01:00
parent abc8198a1f
commit a75041e8dd
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GPG Key ID: 5F87E02E5BC0939E
2 changed files with 100 additions and 5 deletions
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83
src/video/SDL_blit_0.c
View File

@ -452,11 +452,94 @@ static const SDL_BlitFunc colorkey_blit[] = {
(SDL_BlitFunc) NULL, BlitBto1Key, BlitBto2Key, BlitBto3Key, BlitBto4Key
};
static void
Blit4bto4(SDL_BlitInfo * info)
{
int width = info->dst_w;
int height = info->dst_h;
Uint8 *src = info->src;
Uint32 *dst = (Uint32 *) info->dst;
int srcskip = info->src_skip;
int dstskip = info->dst_skip;
Uint32 *map = (Uint32 *) info->table;
int c;
/* Set up some basic variables */
srcskip += width - (width + 1) / 2;
while (height--) {
Uint8 byte = 0, bit;
for (c = 0; c < width; ++c) {
if ((c & 0x1) == 0) {
byte = *src++;
}
bit = (byte & 0xF0) >> 4;
if (1) {
*dst = map[bit];
}
byte <<= 4;
dst++;
}
src += srcskip;
dst = (Uint32 *) ((Uint8 *) dst + dstskip);
}
}
static void
Blit4bto4Key(SDL_BlitInfo * info)
{
int width = info->dst_w;
int height = info->dst_h;
Uint8 *src = info->src;
Uint32 *dst = (Uint32 *) info->dst;
int srcskip = info->src_skip;
int dstskip = info->dst_skip;
Uint32 ckey = info->colorkey;
Uint32 *map = (Uint32 *) info->table;
int c;
/* Set up some basic variables */
srcskip += width - (width + 1) / 2;
while (height--) {
Uint8 byte = 0, bit;
for (c = 0; c < width; ++c) {
if ((c & 0x1) == 0) {
byte = *src++;
}
bit = (byte & 0xF0) >> 4;
if (bit != ckey) {
*dst = map[bit];
}
byte <<= 4;
dst++;
}
src += srcskip;
dst = (Uint32 *) ((Uint8 *) dst + dstskip);
}
}
SDL_BlitFunc
SDL_CalculateBlit0(SDL_Surface * surface)
{
int which;
/* 4bits to 32bits */
if (surface->format->BitsPerPixel == 4) {
if (surface->map->dst->format->BytesPerPixel == 4) {
switch (surface->map->info.flags & ~SDL_COPY_RLE_MASK) {
case 0:
return Blit4bto4;
case SDL_COPY_COLORKEY:
return Blit4bto4Key;
}
}
/* We don't fully support 4-bit packed pixel modes */
return NULL;
}
if (surface->format->BitsPerPixel != 1) {
/* We don't support sub 8-bit packed pixel modes */
return (SDL_BlitFunc) NULL;

22
src/video/SDL_fillrect.c
View File

@ -309,11 +309,6 @@ SDL_FillRects(SDL_Surface * dst, const SDL_Rect * rects, int count,
return SDL_InvalidParamError("SDL_FillRects(): dst");
}
/* This function doesn't work on surfaces < 8 bpp */
if (dst->format->BitsPerPixel < 8) {
return SDL_SetError("SDL_FillRects(): Unsupported surface format");
}
/* Nothing to do */
if (dst->w == 0 || dst->h == 0) {
return 0;
@ -328,6 +323,23 @@ SDL_FillRects(SDL_Surface * dst, const SDL_Rect * rects, int count,
return SDL_InvalidParamError("SDL_FillRects(): rects");
}
/* This function doesn't usually work on surfaces < 8 bpp
* Except: support for 4bits, when filling full size.
*/
if (dst->format->BitsPerPixel < 8) {
if (count == 1) {
const SDL_Rect *r = &rects[0];
if (r->x == 0 && r->y == 0 && r->w == dst->w && r->w == dst->h) {
if (dst->format->BitsPerPixel == 4) {
Uint8 b = (((Uint8) color << 4) | (Uint8) color);
SDL_memset(dst->pixels, b, dst->h * dst->pitch);
return 1;
}
}
}
return SDL_SetError("SDL_FillRects(): Unsupported surface format");
}
#if SDL_ARM_NEON_BLITTERS
if (SDL_HasNEON() && dst->format->BytesPerPixel != 3 && fill_function == NULL) {
switch (dst->format->BytesPerPixel) {