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Diffstat (limited to 'source/3rd-party/SDL2/src/video/SDL_blit_1.c')
-rw-r--r--source/3rd-party/SDL2/src/video/SDL_blit_1.c552
1 files changed, 552 insertions, 0 deletions
diff --git a/source/3rd-party/SDL2/src/video/SDL_blit_1.c b/source/3rd-party/SDL2/src/video/SDL_blit_1.c
new file mode 100644
index 0000000..56ccf15
--- /dev/null
+++ b/source/3rd-party/SDL2/src/video/SDL_blit_1.c
@@ -0,0 +1,552 @@
+/*
+ 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"
+#include "SDL_sysvideo.h"
+#include "SDL_endian.h"
+
+/* Functions to blit from 8-bit surfaces to other surfaces */
+
+static void
+Blit1to1(SDL_BlitInfo * info)
+{
+#ifndef USE_DUFFS_LOOP
+ int c;
+#endif
+ 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;
+
+ while (height--) {
+#ifdef USE_DUFFS_LOOP
+ /* *INDENT-OFF* */
+ DUFFS_LOOP(
+ {
+ *dst = map[*src];
+ }
+ dst++;
+ src++;
+ , width);
+ /* *INDENT-ON* */
+#else
+ for (c = width; c; --c) {
+ *dst = map[*src];
+ dst++;
+ src++;
+ }
+#endif
+ src += srcskip;
+ dst += dstskip;
+ }
+}
+
+/* This is now endian dependent */
+#ifndef USE_DUFFS_LOOP
+# if ( SDL_BYTEORDER == SDL_LIL_ENDIAN )
+# define HI 1
+# define LO 0
+# else /* ( SDL_BYTEORDER == SDL_BIG_ENDIAN ) */
+# define HI 0
+# define LO 1
+# endif
+#endif
+static void
+Blit1to2(SDL_BlitInfo * info)
+{
+#ifndef USE_DUFFS_LOOP
+ int c;
+#endif
+ int width, height;
+ Uint8 *src, *dst;
+ Uint16 *map;
+ 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 = (Uint16 *) info->table;
+
+#ifdef USE_DUFFS_LOOP
+ while (height--) {
+ /* *INDENT-OFF* */
+ DUFFS_LOOP(
+ {
+ *(Uint16 *)dst = map[*src++];
+ dst += 2;
+ },
+ width);
+ /* *INDENT-ON* */
+ src += srcskip;
+ dst += dstskip;
+ }
+#else
+ /* Memory align at 4-byte boundary, if necessary */
+ if ((long) dst & 0x03) {
+ /* Don't do anything if width is 0 */
+ if (width == 0) {
+ return;
+ }
+ --width;
+
+ while (height--) {
+ /* Perform copy alignment */
+ *(Uint16 *) dst = map[*src++];
+ dst += 2;
+
+ /* Copy in 4 pixel chunks */
+ for (c = width / 4; c; --c) {
+ *(Uint32 *) dst = (map[src[HI]] << 16) | (map[src[LO]]);
+ src += 2;
+ dst += 4;
+ *(Uint32 *) dst = (map[src[HI]] << 16) | (map[src[LO]]);
+ src += 2;
+ dst += 4;
+ }
+ /* Get any leftovers */
+ switch (width & 3) {
+ case 3:
+ *(Uint16 *) dst = map[*src++];
+ dst += 2;
+ case 2:
+ *(Uint32 *) dst = (map[src[HI]] << 16) | (map[src[LO]]);
+ src += 2;
+ dst += 4;
+ break;
+ case 1:
+ *(Uint16 *) dst = map[*src++];
+ dst += 2;
+ break;
+ }
+ src += srcskip;
+ dst += dstskip;
+ }
+ } else {
+ while (height--) {
+ /* Copy in 4 pixel chunks */
+ for (c = width / 4; c; --c) {
+ *(Uint32 *) dst = (map[src[HI]] << 16) | (map[src[LO]]);
+ src += 2;
+ dst += 4;
+ *(Uint32 *) dst = (map[src[HI]] << 16) | (map[src[LO]]);
+ src += 2;
+ dst += 4;
+ }
+ /* Get any leftovers */
+ switch (width & 3) {
+ case 3:
+ *(Uint16 *) dst = map[*src++];
+ dst += 2;
+ case 2:
+ *(Uint32 *) dst = (map[src[HI]] << 16) | (map[src[LO]]);
+ src += 2;
+ dst += 4;
+ break;
+ case 1:
+ *(Uint16 *) dst = map[*src++];
+ dst += 2;
+ break;
+ }
+ src += srcskip;
+ dst += dstskip;
+ }
+ }
+#endif /* USE_DUFFS_LOOP */
+}
+
+static void
+Blit1to3(SDL_BlitInfo * info)
+{
+#ifndef USE_DUFFS_LOOP
+ int c;
+#endif
+ int 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;
+
+ while (height--) {
+#ifdef USE_DUFFS_LOOP
+ /* *INDENT-OFF* */
+ DUFFS_LOOP(
+ {
+ o = *src * 4;
+ dst[0] = map[o++];
+ dst[1] = map[o++];
+ dst[2] = map[o++];
+ }
+ src++;
+ dst += 3;
+ , width);
+ /* *INDENT-ON* */
+#else
+ for (c = width; c; --c) {
+ o = *src * 4;
+ dst[0] = map[o++];
+ dst[1] = map[o++];
+ dst[2] = map[o++];
+ src++;
+ dst += 3;
+ }
+#endif /* USE_DUFFS_LOOP */
+ src += srcskip;
+ dst += dstskip;
+ }
+}
+
+static void
+Blit1to4(SDL_BlitInfo * info)
+{
+#ifndef USE_DUFFS_LOOP
+ int c;
+#endif
+ int width, height;
+ Uint8 *src;
+ Uint32 *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 = (Uint32 *) info->dst;
+ dstskip = info->dst_skip / 4;
+ map = (Uint32 *) info->table;
+
+ while (height--) {
+#ifdef USE_DUFFS_LOOP
+ /* *INDENT-OFF* */
+ DUFFS_LOOP(
+ *dst++ = map[*src++];
+ , width);
+ /* *INDENT-ON* */
+#else
+ for (c = width / 4; c; --c) {
+ *dst++ = map[*src++];
+ *dst++ = map[*src++];
+ *dst++ = map[*src++];
+ *dst++ = map[*src++];
+ }
+ switch (width & 3) {
+ case 3:
+ *dst++ = map[*src++];
+ case 2:
+ *dst++ = map[*src++];
+ case 1:
+ *dst++ = map[*src++];
+ }
+#endif /* USE_DUFFS_LOOP */
+ src += srcskip;
+ dst += dstskip;
+ }
+}
+
+static void
+Blit1to1Key(SDL_BlitInfo * info)
+{
+ int width = info->dst_w;
+ int height = info->dst_h;
+ Uint8 *src = info->src;
+ int srcskip = info->src_skip;
+ Uint8 *dst = info->dst;
+ int dstskip = info->dst_skip;
+ Uint8 *palmap = info->table;
+ Uint32 ckey = info->colorkey;
+
+ if (palmap) {
+ while (height--) {
+ /* *INDENT-OFF* */
+ DUFFS_LOOP(
+ {
+ if ( *src != ckey ) {
+ *dst = palmap[*src];
+ }
+ dst++;
+ src++;
+ },
+ width);
+ /* *INDENT-ON* */
+ src += srcskip;
+ dst += dstskip;
+ }
+ } else {
+ while (height--) {
+ /* *INDENT-OFF* */
+ DUFFS_LOOP(
+ {
+ if ( *src != ckey ) {
+ *dst = *src;
+ }
+ dst++;
+ src++;
+ },
+ width);
+ /* *INDENT-ON* */
+ src += srcskip;
+ dst += dstskip;
+ }
+ }
+}
+
+static void
+Blit1to2Key(SDL_BlitInfo * info)
+{
+ int width = info->dst_w;
+ int height = info->dst_h;
+ Uint8 *src = info->src;
+ int srcskip = info->src_skip;
+ Uint16 *dstp = (Uint16 *) info->dst;
+ int dstskip = info->dst_skip;
+ Uint16 *palmap = (Uint16 *) info->table;
+ Uint32 ckey = info->colorkey;
+
+ /* Set up some basic variables */
+ dstskip /= 2;
+
+ while (height--) {
+ /* *INDENT-OFF* */
+ DUFFS_LOOP(
+ {
+ if ( *src != ckey ) {
+ *dstp=palmap[*src];
+ }
+ src++;
+ dstp++;
+ },
+ width);
+ /* *INDENT-ON* */
+ src += srcskip;
+ dstp += dstskip;
+ }
+}
+
+static void
+Blit1to3Key(SDL_BlitInfo * info)
+{
+ int width = info->dst_w;
+ int height = info->dst_h;
+ Uint8 *src = info->src;
+ int srcskip = info->src_skip;
+ Uint8 *dst = info->dst;
+ int dstskip = info->dst_skip;
+ Uint8 *palmap = info->table;
+ Uint32 ckey = info->colorkey;
+ int o;
+
+ while (height--) {
+ /* *INDENT-OFF* */
+ DUFFS_LOOP(
+ {
+ if ( *src != ckey ) {
+ o = *src * 4;
+ dst[0] = palmap[o++];
+ dst[1] = palmap[o++];
+ dst[2] = palmap[o++];
+ }
+ src++;
+ dst += 3;
+ },
+ width);
+ /* *INDENT-ON* */
+ src += srcskip;
+ dst += dstskip;
+ }
+}
+
+static void
+Blit1to4Key(SDL_BlitInfo * info)
+{
+ int width = info->dst_w;
+ int height = info->dst_h;
+ Uint8 *src = info->src;
+ int srcskip = info->src_skip;
+ Uint32 *dstp = (Uint32 *) info->dst;
+ int dstskip = info->dst_skip;
+ Uint32 *palmap = (Uint32 *) info->table;
+ Uint32 ckey = info->colorkey;
+
+ /* Set up some basic variables */
+ dstskip /= 4;
+
+ while (height--) {
+ /* *INDENT-OFF* */
+ DUFFS_LOOP(
+ {
+ if ( *src != ckey ) {
+ *dstp = palmap[*src];
+ }
+ src++;
+ dstp++;
+ },
+ width);
+ /* *INDENT-ON* */
+ src += srcskip;
+ dstp += dstskip;
+ }
+}
+
+static void
+Blit1toNAlpha(SDL_BlitInfo * info)
+{
+ int width = info->dst_w;
+ int height = info->dst_h;
+ Uint8 *src = info->src;
+ int srcskip = info->src_skip;
+ Uint8 *dst = info->dst;
+ int dstskip = info->dst_skip;
+ SDL_PixelFormat *dstfmt = info->dst_fmt;
+ const SDL_Color *srcpal = info->src_fmt->palette->colors;
+ int dstbpp;
+ Uint32 pixel;
+ unsigned sR, sG, sB;
+ unsigned dR, dG, dB, dA;
+ const unsigned A = info->a;
+
+ /* Set up some basic variables */
+ dstbpp = dstfmt->BytesPerPixel;
+
+ while (height--) {
+ /* *INDENT-OFF* */
+ DUFFS_LOOP4(
+ {
+ sR = srcpal[*src].r;
+ sG = srcpal[*src].g;
+ sB = srcpal[*src].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);
+ src++;
+ dst += dstbpp;
+ },
+ width);
+ /* *INDENT-ON* */
+ src += srcskip;
+ dst += dstskip;
+ }
+}
+
+static void
+Blit1toNAlphaKey(SDL_BlitInfo * info)
+{
+ int width = info->dst_w;
+ int height = info->dst_h;
+ Uint8 *src = info->src;
+ int srcskip = info->src_skip;
+ Uint8 *dst = info->dst;
+ int dstskip = info->dst_skip;
+ SDL_PixelFormat *dstfmt = info->dst_fmt;
+ const SDL_Color *srcpal = info->src_fmt->palette->colors;
+ Uint32 ckey = info->colorkey;
+ int dstbpp;
+ Uint32 pixel;
+ unsigned sR, sG, sB;
+ unsigned dR, dG, dB, dA;
+ const unsigned A = info->a;
+
+ /* Set up some basic variables */
+ dstbpp = dstfmt->BytesPerPixel;
+
+ while (height--) {
+ /* *INDENT-OFF* */
+ DUFFS_LOOP(
+ {
+ if ( *src != ckey ) {
+ sR = srcpal[*src].r;
+ sG = srcpal[*src].g;
+ sB = srcpal[*src].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);
+ }
+ src++;
+ dst += dstbpp;
+ },
+ width);
+ /* *INDENT-ON* */
+ src += srcskip;
+ dst += dstskip;
+ }
+}
+
+static const SDL_BlitFunc one_blit[] = {
+ (SDL_BlitFunc) NULL, Blit1to1, Blit1to2, Blit1to3, Blit1to4
+};
+
+static const SDL_BlitFunc one_blitkey[] = {
+ (SDL_BlitFunc) NULL, Blit1to1Key, Blit1to2Key, Blit1to3Key, Blit1to4Key
+};
+
+SDL_BlitFunc
+SDL_CalculateBlit1(SDL_Surface * surface)
+{
+ int which;
+ SDL_PixelFormat *dstfmt;
+
+ dstfmt = surface->map->dst->format;
+ if (dstfmt->BitsPerPixel < 8) {
+ which = 0;
+ } else {
+ which = dstfmt->BytesPerPixel;
+ }
+ switch (surface->map->info.flags & ~SDL_COPY_RLE_MASK) {
+ case 0:
+ return one_blit[which];
+
+ case SDL_COPY_COLORKEY:
+ return one_blitkey[which];
+
+ case SDL_COPY_MODULATE_ALPHA | SDL_COPY_BLEND:
+ /* Supporting 8bpp->8bpp alpha is doable but requires lots of
+ tables which consume space and takes time to precompute,
+ so is better left to the user */
+ return which >= 2 ? Blit1toNAlpha : (SDL_BlitFunc) NULL;
+
+ case SDL_COPY_COLORKEY | SDL_COPY_MODULATE_ALPHA | SDL_COPY_BLEND:
+ return which >= 2 ? Blit1toNAlphaKey : (SDL_BlitFunc) NULL;
+ }
+ return (SDL_BlitFunc) NULL;
+}
+
+/* vi: set ts=4 sw=4 expandtab: */
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