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Added support for blitting SDL_PIXELFORMAT_INDEX1LSB

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Fixes https://github.com/libsdl-org/SDL/issues/7844
This commit is contained in:
Sam Lantinga 2023-06-19 08:36:30 -07:00
parent d97423ebab
commit a3d4fd71c3
1 changed files with 410 additions and 169 deletions
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241
src/video/SDL_blit_0.c
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@ -45,6 +45,24 @@ static void BlitBto1(SDL_BlitInfo *info)
srcskip += width - (width + 7) / 8;
if (map) {
if (info->src_fmt->format == SDL_PIXELFORMAT_INDEX1LSB) {
while (height--) {
Uint8 byte = 0, bit;
for (c = 0; c < width; ++c) {
if (!(c & 7)) {
byte = *src++;
}
bit = (byte & 0x01);
if (1) {
*dst = map[bit];
}
dst++;
byte >>= 1;
}
src += srcskip;
dst += dstskip;
}
} else {
while (height--) {
Uint8 byte = 0, bit;
for (c = 0; c < width; ++c) {
@ -61,6 +79,25 @@ static void BlitBto1(SDL_BlitInfo *info)
src += srcskip;
dst += dstskip;
}
}
} else {
if (info->src_fmt->format == SDL_PIXELFORMAT_INDEX1LSB) {
while (height--) {
Uint8 byte = 0, bit;
for (c = 0; c < width; ++c) {
if (!(c & 7)) {
byte = *src++;
}
bit = (byte & 0x01);
if (1) {
*dst = bit;
}
dst++;
byte >>= 1;
}
src += srcskip;
dst += dstskip;
}
} else {
while (height--) {
Uint8 byte = 0, bit;
@ -80,6 +117,7 @@ static void BlitBto1(SDL_BlitInfo *info)
}
}
}
}
static void BlitBto2(SDL_BlitInfo *info)
{
@ -99,6 +137,24 @@ static void BlitBto2(SDL_BlitInfo *info)
map = (Uint16 *)info->table;
srcskip += width - (width + 7) / 8;
if (info->src_fmt->format == SDL_PIXELFORMAT_INDEX1LSB) {
while (height--) {
Uint8 byte = 0, bit;
for (c = 0; c < width; ++c) {
if (!(c & 7)) {
byte = *src++;
}
bit = (byte & 0x01);
if (1) {
*dst = map[bit];
}
byte >>= 1;
dst++;
}
src += srcskip;
dst += dstskip;
}
} else {
while (height--) {
Uint8 byte = 0, bit;
for (c = 0; c < width; ++c) {
@ -116,6 +172,7 @@ static void BlitBto2(SDL_BlitInfo *info)
dst += dstskip;
}
}
}
static void BlitBto3(SDL_BlitInfo *info)
{
@ -134,6 +191,27 @@ static void BlitBto3(SDL_BlitInfo *info)
map = info->table;
srcskip += width - (width + 7) / 8;
if (info->src_fmt->format == SDL_PIXELFORMAT_INDEX1LSB) {
while (height--) {
Uint8 byte = 0, bit;
for (c = 0; c < width; ++c) {
if (!(c & 7)) {
byte = *src++;
}
bit = (byte & 0x01);
if (1) {
o = bit * 4;
dst[0] = map[o++];
dst[1] = map[o++];
dst[2] = map[o++];
}
byte >>= 1;
dst += 3;
}
src += srcskip;
dst += dstskip;
}
} else {
while (height--) {
Uint8 byte = 0, bit;
for (c = 0; c < width; ++c) {
@ -154,6 +232,7 @@ static void BlitBto3(SDL_BlitInfo *info)
dst += dstskip;
}
}
}
static void BlitBto4(SDL_BlitInfo *info)
{
@ -173,6 +252,24 @@ static void BlitBto4(SDL_BlitInfo *info)
map = (Uint32 *)info->table;
srcskip += width - (width + 7) / 8;
if (info->src_fmt->format == SDL_PIXELFORMAT_INDEX1LSB) {
while (height--) {
Uint8 byte = 0, bit;
for (c = 0; c < width; ++c) {
if (!(c & 7)) {
byte = *src++;
}
bit = (byte & 0x01);
if (1) {
*dst = map[bit];
}
byte >>= 1;
dst++;
}
src += srcskip;
dst += dstskip;
}
} else {
while (height--) {
Uint8 byte = 0, bit;
for (c = 0; c < width; ++c) {
@ -190,6 +287,7 @@ static void BlitBto4(SDL_BlitInfo *info)
dst += dstskip;
}
}
}
static void BlitBto1Key(SDL_BlitInfo *info)
{
@ -207,6 +305,24 @@ static void BlitBto1Key(SDL_BlitInfo *info)
srcskip += width - (width + 7) / 8;
if (palmap) {
if (info->src_fmt->format == SDL_PIXELFORMAT_INDEX1LSB) {
while (height--) {
Uint8 byte = 0, bit;
for (c = 0; c < width; ++c) {
if (!(c & 7)) {
byte = *src++;
}
bit = (byte & 0x01);
if (bit != ckey) {
*dst = palmap[bit];
}
dst++;
byte >>= 1;
}
src += srcskip;
dst += dstskip;
}
} else {
while (height--) {
Uint8 byte = 0, bit;
for (c = 0; c < width; ++c) {
@ -223,6 +339,25 @@ static void BlitBto1Key(SDL_BlitInfo *info)
src += srcskip;
dst += dstskip;
}
}
} else {
if (info->src_fmt->format == SDL_PIXELFORMAT_INDEX1LSB) {
while (height--) {
Uint8 byte = 0, bit;
for (c = 0; c < width; ++c) {
if (!(c & 7)) {
byte = *src++;
}
bit = (byte & 0x01);
if (bit != ckey) {
*dst = bit;
}
dst++;
byte >>= 1;
}
src += srcskip;
dst += dstskip;
}
} else {
while (height--) {
Uint8 byte = 0, bit;
@ -242,6 +377,7 @@ static void BlitBto1Key(SDL_BlitInfo *info)
}
}
}
}
static void BlitBto2Key(SDL_BlitInfo *info)
{
@ -259,6 +395,24 @@ static void BlitBto2Key(SDL_BlitInfo *info)
srcskip += width - (width + 7) / 8;
dstskip /= 2;
if (info->src_fmt->format == SDL_PIXELFORMAT_INDEX1LSB) {
while (height--) {
Uint8 byte = 0, bit;
for (c = 0; c < width; ++c) {
if (!(c & 7)) {
byte = *src++;
}
bit = (byte & 0x01);
if (bit != ckey) {
*dstp = ((Uint16 *)palmap)[bit];
}
byte >>= 1;
dstp++;
}
src += srcskip;
dstp += dstskip;
}
} else {
while (height--) {
Uint8 byte = 0, bit;
for (c = 0; c < width; ++c) {
@ -276,6 +430,7 @@ static void BlitBto2Key(SDL_BlitInfo *info)
dstp += dstskip;
}
}
}
static void BlitBto3Key(SDL_BlitInfo *info)
{
@ -292,6 +447,24 @@ static void BlitBto3Key(SDL_BlitInfo *info)
/* Set up some basic variables */
srcskip += width - (width + 7) / 8;
if (info->src_fmt->format == SDL_PIXELFORMAT_INDEX1LSB) {
while (height--) {
Uint8 byte = 0, bit;
for (c = 0; c < width; ++c) {
if (!(c & 7)) {
byte = *src++;
}
bit = (byte & 0x01);
if (bit != ckey) {
SDL_memcpy(dst, &palmap[bit * 4], 3);
}
byte >>= 1;
dst += 3;
}
src += srcskip;
dst += dstskip;
}
} else {
while (height--) {
Uint8 byte = 0, bit;
for (c = 0; c < width; ++c) {
@ -309,6 +482,7 @@ static void BlitBto3Key(SDL_BlitInfo *info)
dst += dstskip;
}
}
}
static void BlitBto4Key(SDL_BlitInfo *info)
{
@ -326,6 +500,24 @@ static void BlitBto4Key(SDL_BlitInfo *info)
srcskip += width - (width + 7) / 8;
dstskip /= 4;
if (info->src_fmt->format == SDL_PIXELFORMAT_INDEX1LSB) {
while (height--) {
Uint8 byte = 0, bit;
for (c = 0; c < width; ++c) {
if (!(c & 7)) {
byte = *src++;
}
bit = (byte & 0x01);
if (bit != ckey) {
*dstp = ((Uint32 *)palmap)[bit];
}
byte >>= 1;
dstp++;
}
src += srcskip;
dstp += dstskip;
}
} else {
while (height--) {
Uint8 byte = 0, bit;
for (c = 0; c < width; ++c) {
@ -343,6 +535,7 @@ static void BlitBto4Key(SDL_BlitInfo *info)
dstp += dstskip;
}
}
}
static void BlitBtoNAlpha(SDL_BlitInfo *info)
{
@ -365,6 +558,29 @@ static void BlitBtoNAlpha(SDL_BlitInfo *info)
dstbpp = dstfmt->BytesPerPixel;
srcskip += width - (width + 7) / 8;
if (info->src_fmt->format == SDL_PIXELFORMAT_INDEX1LSB) {
while (height--) {
Uint8 byte = 0, bit;
for (c = 0; c < width; ++c) {
if (!(c & 7)) {
byte = *src++;
}
bit = (byte & 0x01);
if (1) {
sR = srcpal[bit].r;
sG = srcpal[bit].g;
sB = srcpal[bit].b;
DISEMBLE_RGBA(dst, dstbpp, dstfmt, pixel, dR, dG, dB, dA);
ALPHA_BLEND_RGBA(sR, sG, sB, A, dR, dG, dB, dA);
ASSEMBLE_RGBA(dst, dstbpp, dstfmt, dR, dG, dB, dA);
}
byte >>= 1;
dst += dstbpp;
}
src += srcskip;
dst += dstskip;
}
} else {
while (height--) {
Uint8 byte = 0, bit;
for (c = 0; c < width; ++c) {
@ -387,6 +603,7 @@ static void BlitBtoNAlpha(SDL_BlitInfo *info)
dst += dstskip;
}
}
}
static void BlitBtoNAlphaKey(SDL_BlitInfo *info)
{
@ -411,6 +628,29 @@ static void BlitBtoNAlphaKey(SDL_BlitInfo *info)
dstbpp = dstfmt->BytesPerPixel;
srcskip += width - (width + 7) / 8;
if (info->src_fmt->format == SDL_PIXELFORMAT_INDEX1LSB) {
while (height--) {
Uint8 byte = 0, bit;
for (c = 0; c < width; ++c) {
if (!(c & 7)) {
byte = *src++;
}
bit = (byte & 0x01);
if (bit != ckey) {
sR = srcpal[bit].r;
sG = srcpal[bit].g;
sB = srcpal[bit].b;
DISEMBLE_RGBA(dst, dstbpp, dstfmt, pixel, dR, dG, dB, dA);
ALPHA_BLEND_RGBA(sR, sG, sB, A, dR, dG, dB, dA);
ASSEMBLE_RGBA(dst, dstbpp, dstfmt, dR, dG, dB, dA);
}
byte >>= 1;
dst += dstbpp;
}
src += srcskip;
dst += dstskip;
}
} else {
while (height--) {
Uint8 byte = 0, bit;
for (c = 0; c < width; ++c) {
@ -433,6 +673,7 @@ static void BlitBtoNAlphaKey(SDL_BlitInfo *info)
dst += dstskip;
}
}
}
static const SDL_BlitFunc bitmap_blit[] = {
(SDL_BlitFunc)NULL, BlitBto1, BlitBto2, BlitBto3, BlitBto4