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Diffstat (limited to 'source/3rd-party/SDL2/src/video/SDL_blit_0.c')
-rw-r--r--source/3rd-party/SDL2/src/video/SDL_blit_0.c483
1 files changed, 483 insertions, 0 deletions
diff --git a/source/3rd-party/SDL2/src/video/SDL_blit_0.c b/source/3rd-party/SDL2/src/video/SDL_blit_0.c
new file mode 100644
index 0000000..b5c8efb
--- /dev/null
+++ b/source/3rd-party/SDL2/src/video/SDL_blit_0.c
@@ -0,0 +1,483 @@
+/*
+ Simple DirectMedia Layer
+ Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
+
+ This software is provided 'as-is', without any express or implied
+ warranty. In no event will the authors be held liable for any damages
+ arising from the use of this software.
+
+ Permission is granted to anyone to use this software for any purpose,
+ including commercial applications, and to alter it and redistribute it
+ freely, subject to the following restrictions:
+
+ 1. The origin of this software must not be misrepresented; you must not
+ claim that you wrote the original software. If you use this software
+ in a product, an acknowledgment in the product documentation would be
+ appreciated but is not required.
+ 2. Altered source versions must be plainly marked as such, and must not be
+ misrepresented as being the original software.
+ 3. This notice may not be removed or altered from any source distribution.
+*/
+#include "../SDL_internal.h"
+
+#include "SDL_video.h"
+#include "SDL_blit.h"
+
+/* Functions to blit from bitmaps to other surfaces */
+
+static void
+BlitBto1(SDL_BlitInfo * info)
+{
+ int c;
+ int width, height;
+ Uint8 *src, *map, *dst;
+ int srcskip, dstskip;
+
+ /* Set up some basic variables */
+ width = info->dst_w;
+ height = info->dst_h;
+ src = info->src;
+ srcskip = info->src_skip;
+ dst = info->dst;
+ dstskip = info->dst_skip;
+ map = info->table;
+ srcskip += width - (width + 7) / 8;
+
+ if (map) {
+ while (height--) {
+ Uint8 byte = 0, bit;
+ for (c = 0; c < width; ++c) {
+ if ((c & 7) == 0) {
+ byte = *src++;
+ }
+ bit = (byte & 0x80) >> 7;
+ 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) {
+ if ((c & 7) == 0) {
+ byte = *src++;
+ }
+ bit = (byte & 0x80) >> 7;
+ if (1) {
+ *dst = bit;
+ }
+ dst++;
+ byte <<= 1;
+ }
+ src += srcskip;
+ dst += dstskip;
+ }
+ }
+}
+
+static void
+BlitBto2(SDL_BlitInfo * info)
+{
+ int c;
+ int width, height;
+ Uint8 *src;
+ Uint16 *map, *dst;
+ int srcskip, dstskip;
+
+ /* Set up some basic variables */
+ width = info->dst_w;
+ height = info->dst_h;
+ src = info->src;
+ srcskip = info->src_skip;
+ dst = (Uint16 *) info->dst;
+ dstskip = info->dst_skip / 2;
+ map = (Uint16 *) info->table;
+ srcskip += width - (width + 7) / 8;
+
+ while (height--) {
+ Uint8 byte = 0, bit;
+ for (c = 0; c < width; ++c) {
+ if ((c & 7) == 0) {
+ byte = *src++;
+ }
+ bit = (byte & 0x80) >> 7;
+ if (1) {
+ *dst = map[bit];
+ }
+ byte <<= 1;
+ dst++;
+ }
+ src += srcskip;
+ dst += dstskip;
+ }
+}
+
+static void
+BlitBto3(SDL_BlitInfo * info)
+{
+ int c, o;
+ int width, height;
+ Uint8 *src, *map, *dst;
+ int srcskip, dstskip;
+
+ /* Set up some basic variables */
+ width = info->dst_w;
+ height = info->dst_h;
+ src = info->src;
+ srcskip = info->src_skip;
+ dst = info->dst;
+ dstskip = info->dst_skip;
+ map = info->table;
+ srcskip += width - (width + 7) / 8;
+
+ while (height--) {
+ Uint8 byte = 0, bit;
+ for (c = 0; c < width; ++c) {
+ if ((c & 7) == 0) {
+ byte = *src++;
+ }
+ bit = (byte & 0x80) >> 7;
+ 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;
+ }
+}
+
+static void
+BlitBto4(SDL_BlitInfo * info)
+{
+ int width, height;
+ Uint8 *src;
+ Uint32 *map, *dst;
+ int srcskip, dstskip;
+ int c;
+
+ /* Set up some basic variables */
+ width = info->dst_w;
+ height = info->dst_h;
+ src = info->src;
+ srcskip = info->src_skip;
+ dst = (Uint32 *) info->dst;
+ dstskip = info->dst_skip / 4;
+ map = (Uint32 *) info->table;
+ srcskip += width - (width + 7) / 8;
+
+ while (height--) {
+ Uint8 byte = 0, bit;
+ for (c = 0; c < width; ++c) {
+ if ((c & 7) == 0) {
+ byte = *src++;
+ }
+ bit = (byte & 0x80) >> 7;
+ if (1) {
+ *dst = map[bit];
+ }
+ byte <<= 1;
+ dst++;
+ }
+ src += srcskip;
+ dst += dstskip;
+ }
+}
+
+static void
+BlitBto1Key(SDL_BlitInfo * info)
+{
+ int width = info->dst_w;
+ int height = info->dst_h;
+ Uint8 *src = info->src;
+ Uint8 *dst = info->dst;
+ int srcskip = info->src_skip;
+ int dstskip = info->dst_skip;
+ Uint32 ckey = info->colorkey;
+ Uint8 *palmap = info->table;
+ int c;
+
+ /* Set up some basic variables */
+ srcskip += width - (width + 7) / 8;
+
+ if (palmap) {
+ while (height--) {
+ Uint8 byte = 0, bit;
+ for (c = 0; c < width; ++c) {
+ if ((c & 7) == 0) {
+ byte = *src++;
+ }
+ bit = (byte & 0x80) >> 7;
+ 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) {
+ if ((c & 7) == 0) {
+ byte = *src++;
+ }
+ bit = (byte & 0x80) >> 7;
+ if (bit != ckey) {
+ *dst = bit;
+ }
+ dst++;
+ byte <<= 1;
+ }
+ src += srcskip;
+ dst += dstskip;
+ }
+ }
+}
+
+static void
+BlitBto2Key(SDL_BlitInfo * info)
+{
+ int width = info->dst_w;
+ int height = info->dst_h;
+ Uint8 *src = info->src;
+ Uint16 *dstp = (Uint16 *) info->dst;
+ int srcskip = info->src_skip;
+ int dstskip = info->dst_skip;
+ Uint32 ckey = info->colorkey;
+ Uint8 *palmap = info->table;
+ int c;
+
+ /* Set up some basic variables */
+ srcskip += width - (width + 7) / 8;
+ dstskip /= 2;
+
+ while (height--) {
+ Uint8 byte = 0, bit;
+ for (c = 0; c < width; ++c) {
+ if ((c & 7) == 0) {
+ byte = *src++;
+ }
+ bit = (byte & 0x80) >> 7;
+ if (bit != ckey) {
+ *dstp = ((Uint16 *) palmap)[bit];
+ }
+ byte <<= 1;
+ dstp++;
+ }
+ src += srcskip;
+ dstp += dstskip;
+ }
+}
+
+static void
+BlitBto3Key(SDL_BlitInfo * info)
+{
+ int width = info->dst_w;
+ int height = info->dst_h;
+ Uint8 *src = info->src;
+ Uint8 *dst = info->dst;
+ int srcskip = info->src_skip;
+ int dstskip = info->dst_skip;
+ Uint32 ckey = info->colorkey;
+ Uint8 *palmap = info->table;
+ int c;
+
+ /* Set up some basic variables */
+ srcskip += width - (width + 7) / 8;
+
+ while (height--) {
+ Uint8 byte = 0, bit;
+ for (c = 0; c < width; ++c) {
+ if ((c & 7) == 0) {
+ byte = *src++;
+ }
+ bit = (byte & 0x80) >> 7;
+ if (bit != ckey) {
+ SDL_memcpy(dst, &palmap[bit * 4], 3);
+ }
+ byte <<= 1;
+ dst += 3;
+ }
+ src += srcskip;
+ dst += dstskip;
+ }
+}
+
+static void
+BlitBto4Key(SDL_BlitInfo * info)
+{
+ int width = info->dst_w;
+ int height = info->dst_h;
+ Uint8 *src = info->src;
+ Uint32 *dstp = (Uint32 *) info->dst;
+ int srcskip = info->src_skip;
+ int dstskip = info->dst_skip;
+ Uint32 ckey = info->colorkey;
+ Uint8 *palmap = info->table;
+ int c;
+
+ /* Set up some basic variables */
+ srcskip += width - (width + 7) / 8;
+ dstskip /= 4;
+
+ while (height--) {
+ Uint8 byte = 0, bit;
+ for (c = 0; c < width; ++c) {
+ if ((c & 7) == 0) {
+ byte = *src++;
+ }
+ bit = (byte & 0x80) >> 7;
+ if (bit != ckey) {
+ *dstp = ((Uint32 *) palmap)[bit];
+ }
+ byte <<= 1;
+ dstp++;
+ }
+ src += srcskip;
+ dstp += dstskip;
+ }
+}
+
+static void
+BlitBtoNAlpha(SDL_BlitInfo * info)
+{
+ int width = info->dst_w;
+ int height = info->dst_h;
+ Uint8 *src = info->src;
+ Uint8 *dst = info->dst;
+ int srcskip = info->src_skip;
+ int dstskip = info->dst_skip;
+ const SDL_Color *srcpal = info->src_fmt->palette->colors;
+ SDL_PixelFormat *dstfmt = info->dst_fmt;
+ int dstbpp;
+ int c;
+ Uint32 pixel;
+ unsigned sR, sG, sB;
+ unsigned dR, dG, dB, dA;
+ const unsigned A = info->a;
+
+ /* Set up some basic variables */
+ dstbpp = dstfmt->BytesPerPixel;
+ srcskip += width - (width + 7) / 8;
+
+ while (height--) {
+ Uint8 byte = 0, bit;
+ for (c = 0; c < width; ++c) {
+ if ((c & 7) == 0) {
+ byte = *src++;
+ }
+ bit = (byte & 0x80) >> 7;
+ 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;
+ }
+}
+
+static void
+BlitBtoNAlphaKey(SDL_BlitInfo * info)
+{
+ int width = info->dst_w;
+ int height = info->dst_h;
+ Uint8 *src = info->src;
+ Uint8 *dst = info->dst;
+ int srcskip = info->src_skip;
+ int dstskip = info->dst_skip;
+ SDL_PixelFormat *srcfmt = info->src_fmt;
+ SDL_PixelFormat *dstfmt = info->dst_fmt;
+ const SDL_Color *srcpal = srcfmt->palette->colors;
+ int dstbpp;
+ int c;
+ Uint32 pixel;
+ unsigned sR, sG, sB;
+ unsigned dR, dG, dB, dA;
+ const unsigned A = info->a;
+ Uint32 ckey = info->colorkey;
+
+ /* Set up some basic variables */
+ dstbpp = dstfmt->BytesPerPixel;
+ srcskip += width - (width + 7) / 8;
+
+ while (height--) {
+ Uint8 byte = 0, bit;
+ for (c = 0; c < width; ++c) {
+ if ((c & 7) == 0) {
+ byte = *src++;
+ }
+ bit = (byte & 0x80) >> 7;
+ 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;
+ }
+}
+
+static const SDL_BlitFunc bitmap_blit[] = {
+ (SDL_BlitFunc) NULL, BlitBto1, BlitBto2, BlitBto3, BlitBto4
+};
+
+static const SDL_BlitFunc colorkey_blit[] = {
+ (SDL_BlitFunc) NULL, BlitBto1Key, BlitBto2Key, BlitBto3Key, BlitBto4Key
+};
+
+SDL_BlitFunc
+SDL_CalculateBlit0(SDL_Surface * surface)
+{
+ int which;
+
+ if (surface->format->BitsPerPixel != 1) {
+ /* We don't support sub 8-bit packed pixel modes */
+ return (SDL_BlitFunc) NULL;
+ }
+ if (surface->map->dst->format->BitsPerPixel < 8) {
+ which = 0;
+ } else {
+ which = surface->map->dst->format->BytesPerPixel;
+ }
+ switch (surface->map->info.flags & ~SDL_COPY_RLE_MASK) {
+ case 0:
+ return bitmap_blit[which];
+
+ case SDL_COPY_COLORKEY:
+ return colorkey_blit[which];
+
+ case SDL_COPY_MODULATE_ALPHA | SDL_COPY_BLEND:
+ return which >= 2 ? BlitBtoNAlpha : (SDL_BlitFunc) NULL;
+
+ case SDL_COPY_COLORKEY | SDL_COPY_MODULATE_ALPHA | SDL_COPY_BLEND:
+ return which >= 2 ? BlitBtoNAlphaKey : (SDL_BlitFunc) NULL;
+ }
+ return (SDL_BlitFunc) NULL;
+}
+
+/* vi: set ts=4 sw=4 expandtab: */
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