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Diffstat (limited to '3rdparty/SDL2/src/video/SDL_RLEaccel.c')
-rw-r--r--3rdparty/SDL2/src/video/SDL_RLEaccel.c1581
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diff --git a/3rdparty/SDL2/src/video/SDL_RLEaccel.c b/3rdparty/SDL2/src/video/SDL_RLEaccel.c
deleted file mode 100644
index 67baaf664ee..00000000000
--- a/3rdparty/SDL2/src/video/SDL_RLEaccel.c
+++ /dev/null
@@ -1,1581 +0,0 @@
-/*
- Simple DirectMedia Layer
- Copyright (C) 1997-2016 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"
-
-/*
- * RLE encoding for software colorkey and alpha-channel acceleration
- *
- * Original version by Sam Lantinga
- *
- * Mattias Engdegård (Yorick): Rewrite. New encoding format, encoder and
- * decoder. Added per-surface alpha blitter. Added per-pixel alpha
- * format, encoder and blitter.
- *
- * Many thanks to Xark and johns for hints, benchmarks and useful comments
- * leading to this code.
- *
- * Welcome to Macro Mayhem.
- */
-
-/*
- * The encoding translates the image data to a stream of segments of the form
- *
- * <skip> <run> <data>
- *
- * where <skip> is the number of transparent pixels to skip,
- * <run> is the number of opaque pixels to blit,
- * and <data> are the pixels themselves.
- *
- * This basic structure is used both for colorkeyed surfaces, used for simple
- * binary transparency and for per-surface alpha blending, and for surfaces
- * with per-pixel alpha. The details differ, however:
- *
- * Encoding of colorkeyed surfaces:
- *
- * Encoded pixels always have the same format as the target surface.
- * <skip> and <run> are unsigned 8 bit integers, except for 32 bit depth
- * where they are 16 bit. This makes the pixel data aligned at all times.
- * Segments never wrap around from one scan line to the next.
- *
- * The end of the sequence is marked by a zero <skip>,<run> pair at the *
- * beginning of a line.
- *
- * Encoding of surfaces with per-pixel alpha:
- *
- * The sequence begins with a struct RLEDestFormat describing the target
- * pixel format, to provide reliable un-encoding.
- *
- * Each scan line is encoded twice: First all completely opaque pixels,
- * encoded in the target format as described above, and then all
- * partially transparent (translucent) pixels (where 1 <= alpha <= 254),
- * in the following 32-bit format:
- *
- * For 32-bit targets, each pixel has the target RGB format but with
- * the alpha value occupying the highest 8 bits. The <skip> and <run>
- * counts are 16 bit.
- *
- * For 16-bit targets, each pixel has the target RGB format, but with
- * the middle component (usually green) shifted 16 steps to the left,
- * and the hole filled with the 5 most significant bits of the alpha value.
- * i.e. if the target has the format rrrrrggggggbbbbb,
- * the encoded pixel will be 00000gggggg00000rrrrr0aaaaabbbbb.
- * The <skip> and <run> counts are 8 bit for the opaque lines, 16 bit
- * for the translucent lines. Two padding bytes may be inserted
- * before each translucent line to keep them 32-bit aligned.
- *
- * The end of the sequence is marked by a zero <skip>,<run> pair at the
- * beginning of an opaque line.
- */
-
-#include "SDL_video.h"
-#include "SDL_sysvideo.h"
-#include "SDL_blit.h"
-#include "SDL_RLEaccel_c.h"
-
-#ifndef MAX
-#define MAX(a, b) ((a) > (b) ? (a) : (b))
-#endif
-#ifndef MIN
-#define MIN(a, b) ((a) < (b) ? (a) : (b))
-#endif
-
-#define PIXEL_COPY(to, from, len, bpp) \
- SDL_memcpy(to, from, (size_t)(len) * (bpp))
-
-/*
- * Various colorkey blit methods, for opaque and per-surface alpha
- */
-
-#define OPAQUE_BLIT(to, from, length, bpp, alpha) \
- PIXEL_COPY(to, from, length, bpp)
-
-/*
- * For 32bpp pixels on the form 0x00rrggbb:
- * If we treat the middle component separately, we can process the two
- * remaining in parallel. This is safe to do because of the gap to the left
- * of each component, so the bits from the multiplication don't collide.
- * This can be used for any RGB permutation of course.
- */
-#define ALPHA_BLIT32_888(to, from, length, bpp, alpha) \
- do { \
- int i; \
- Uint32 *src = (Uint32 *)(from); \
- Uint32 *dst = (Uint32 *)(to); \
- for (i = 0; i < (int)(length); i++) { \
- Uint32 s = *src++; \
- Uint32 d = *dst; \
- Uint32 s1 = s & 0xff00ff; \
- Uint32 d1 = d & 0xff00ff; \
- d1 = (d1 + ((s1 - d1) * alpha >> 8)) & 0xff00ff; \
- s &= 0xff00; \
- d &= 0xff00; \
- d = (d + ((s - d) * alpha >> 8)) & 0xff00; \
- *dst++ = d1 | d; \
- } \
- } while (0)
-
-/*
- * For 16bpp pixels we can go a step further: put the middle component
- * in the high 16 bits of a 32 bit word, and process all three RGB
- * components at the same time. Since the smallest gap is here just
- * 5 bits, we have to scale alpha down to 5 bits as well.
- */
-#define ALPHA_BLIT16_565(to, from, length, bpp, alpha) \
- do { \
- int i; \
- Uint16 *src = (Uint16 *)(from); \
- Uint16 *dst = (Uint16 *)(to); \
- Uint32 ALPHA = alpha >> 3; \
- for(i = 0; i < (int)(length); i++) { \
- Uint32 s = *src++; \
- Uint32 d = *dst; \
- s = (s | s << 16) & 0x07e0f81f; \
- d = (d | d << 16) & 0x07e0f81f; \
- d += (s - d) * ALPHA >> 5; \
- d &= 0x07e0f81f; \
- *dst++ = (Uint16)(d | d >> 16); \
- } \
- } while(0)
-
-#define ALPHA_BLIT16_555(to, from, length, bpp, alpha) \
- do { \
- int i; \
- Uint16 *src = (Uint16 *)(from); \
- Uint16 *dst = (Uint16 *)(to); \
- Uint32 ALPHA = alpha >> 3; \
- for(i = 0; i < (int)(length); i++) { \
- Uint32 s = *src++; \
- Uint32 d = *dst; \
- s = (s | s << 16) & 0x03e07c1f; \
- d = (d | d << 16) & 0x03e07c1f; \
- d += (s - d) * ALPHA >> 5; \
- d &= 0x03e07c1f; \
- *dst++ = (Uint16)(d | d >> 16); \
- } \
- } while(0)
-
-/*
- * The general slow catch-all function, for remaining depths and formats
- */
-#define ALPHA_BLIT_ANY(to, from, length, bpp, alpha) \
- do { \
- int i; \
- Uint8 *src = from; \
- Uint8 *dst = to; \
- for (i = 0; i < (int)(length); i++) { \
- Uint32 s, d; \
- unsigned rs, gs, bs, rd, gd, bd; \
- switch (bpp) { \
- case 2: \
- s = *(Uint16 *)src; \
- d = *(Uint16 *)dst; \
- break; \
- case 3: \
- if (SDL_BYTEORDER == SDL_BIG_ENDIAN) { \
- s = (src[0] << 16) | (src[1] << 8) | src[2]; \
- d = (dst[0] << 16) | (dst[1] << 8) | dst[2]; \
- } else { \
- s = (src[2] << 16) | (src[1] << 8) | src[0]; \
- d = (dst[2] << 16) | (dst[1] << 8) | dst[0]; \
- } \
- break; \
- case 4: \
- s = *(Uint32 *)src; \
- d = *(Uint32 *)dst; \
- break; \
- } \
- RGB_FROM_PIXEL(s, fmt, rs, gs, bs); \
- RGB_FROM_PIXEL(d, fmt, rd, gd, bd); \
- rd += (rs - rd) * alpha >> 8; \
- gd += (gs - gd) * alpha >> 8; \
- bd += (bs - bd) * alpha >> 8; \
- PIXEL_FROM_RGB(d, fmt, rd, gd, bd); \
- switch (bpp) { \
- case 2: \
- *(Uint16 *)dst = (Uint16)d; \
- break; \
- case 3: \
- if (SDL_BYTEORDER == SDL_BIG_ENDIAN) { \
- dst[0] = (Uint8)(d >> 16); \
- dst[1] = (Uint8)(d >> 8); \
- dst[2] = (Uint8)(d); \
- } else { \
- dst[0] = (Uint8)d; \
- dst[1] = (Uint8)(d >> 8); \
- dst[2] = (Uint8)(d >> 16); \
- } \
- break; \
- case 4: \
- *(Uint32 *)dst = d; \
- break; \
- } \
- src += bpp; \
- dst += bpp; \
- } \
- } while(0)
-
-/*
- * Special case: 50% alpha (alpha=128)
- * This is treated specially because it can be optimized very well, and
- * since it is good for many cases of semi-translucency.
- * The theory is to do all three components at the same time:
- * First zero the lowest bit of each component, which gives us room to
- * add them. Then shift right and add the sum of the lowest bits.
- */
-#define ALPHA_BLIT32_888_50(to, from, length, bpp, alpha) \
- do { \
- int i; \
- Uint32 *src = (Uint32 *)(from); \
- Uint32 *dst = (Uint32 *)(to); \
- for(i = 0; i < (int)(length); i++) { \
- Uint32 s = *src++; \
- Uint32 d = *dst; \
- *dst++ = (((s & 0x00fefefe) + (d & 0x00fefefe)) >> 1) \
- + (s & d & 0x00010101); \
- } \
- } while(0)
-
-/*
- * For 16bpp, we can actually blend two pixels in parallel, if we take
- * care to shift before we add, not after.
- */
-
-/* helper: blend a single 16 bit pixel at 50% */
-#define BLEND16_50(dst, src, mask) \
- do { \
- Uint32 s = *src++; \
- Uint32 d = *dst; \
- *dst++ = (Uint16)((((s & mask) + (d & mask)) >> 1) + \
- (s & d & (~mask & 0xffff))); \
- } while(0)
-
-/* basic 16bpp blender. mask is the pixels to keep when adding. */
-#define ALPHA_BLIT16_50(to, from, length, bpp, alpha, mask) \
- do { \
- unsigned n = (length); \
- Uint16 *src = (Uint16 *)(from); \
- Uint16 *dst = (Uint16 *)(to); \
- if (((uintptr_t)src ^ (uintptr_t)dst) & 3) { \
- /* source and destination not in phase, blit one by one */ \
- while (n--) \
- BLEND16_50(dst, src, mask); \
- } else { \
- if ((uintptr_t)src & 3) { \
- /* first odd pixel */ \
- BLEND16_50(dst, src, mask); \
- n--; \
- } \
- for (; n > 1; n -= 2) { \
- Uint32 s = *(Uint32 *)src; \
- Uint32 d = *(Uint32 *)dst; \
- *(Uint32 *)dst = ((s & (mask | mask << 16)) >> 1) \
- + ((d & (mask | mask << 16)) >> 1) \
- + (s & d & (~(mask | mask << 16))); \
- src += 2; \
- dst += 2; \
- } \
- if (n) \
- BLEND16_50(dst, src, mask); /* last odd pixel */ \
- } \
- } while(0)
-
-#define ALPHA_BLIT16_565_50(to, from, length, bpp, alpha) \
- ALPHA_BLIT16_50(to, from, length, bpp, alpha, 0xf7de)
-
-#define ALPHA_BLIT16_555_50(to, from, length, bpp, alpha) \
- ALPHA_BLIT16_50(to, from, length, bpp, alpha, 0xfbde)
-
-#define CHOOSE_BLIT(blitter, alpha, fmt) \
- do { \
- if (alpha == 255) { \
- switch (fmt->BytesPerPixel) { \
- case 1: blitter(1, Uint8, OPAQUE_BLIT); break; \
- case 2: blitter(2, Uint8, OPAQUE_BLIT); break; \
- case 3: blitter(3, Uint8, OPAQUE_BLIT); break; \
- case 4: blitter(4, Uint16, OPAQUE_BLIT); break; \
- } \
- } else { \
- switch (fmt->BytesPerPixel) { \
- case 1: \
- /* No 8bpp alpha blitting */ \
- break; \
- \
- case 2: \
- switch (fmt->Rmask | fmt->Gmask | fmt->Bmask) { \
- case 0xffff: \
- if (fmt->Gmask == 0x07e0 \
- || fmt->Rmask == 0x07e0 \
- || fmt->Bmask == 0x07e0) { \
- if (alpha == 128) { \
- blitter(2, Uint8, ALPHA_BLIT16_565_50); \
- } else { \
- blitter(2, Uint8, ALPHA_BLIT16_565); \
- } \
- } else \
- goto general16; \
- break; \
- \
- case 0x7fff: \
- if (fmt->Gmask == 0x03e0 \
- || fmt->Rmask == 0x03e0 \
- || fmt->Bmask == 0x03e0) { \
- if (alpha == 128) { \
- blitter(2, Uint8, ALPHA_BLIT16_555_50); \
- } else { \
- blitter(2, Uint8, ALPHA_BLIT16_555); \
- } \
- break; \
- } else \
- goto general16; \
- break; \
- \
- default: \
- general16: \
- blitter(2, Uint8, ALPHA_BLIT_ANY); \
- } \
- break; \
- \
- case 3: \
- blitter(3, Uint8, ALPHA_BLIT_ANY); \
- break; \
- \
- case 4: \
- if ((fmt->Rmask | fmt->Gmask | fmt->Bmask) == 0x00ffffff \
- && (fmt->Gmask == 0xff00 || fmt->Rmask == 0xff00 \
- || fmt->Bmask == 0xff00)) { \
- if (alpha == 128) { \
- blitter(4, Uint16, ALPHA_BLIT32_888_50); \
- } else { \
- blitter(4, Uint16, ALPHA_BLIT32_888); \
- } \
- } else \
- blitter(4, Uint16, ALPHA_BLIT_ANY); \
- break; \
- } \
- } \
- } while(0)
-
-/*
- * Set a pixel value using the given format, except that the alpha value is
- * placed in the top byte. This is the format used for RLE with alpha.
- */
-#define RLEPIXEL_FROM_RGBA(Pixel, fmt, r, g, b, a) \
-{ \
- Pixel = ((r>>fmt->Rloss)<<fmt->Rshift)| \
- ((g>>fmt->Gloss)<<fmt->Gshift)| \
- ((b>>fmt->Bloss)<<fmt->Bshift)| \
- (a<<24); \
-}
-
-/*
- * This takes care of the case when the surface is clipped on the left and/or
- * right. Top clipping has already been taken care of.
- */
-static void
-RLEClipBlit(int w, Uint8 * srcbuf, SDL_Surface * surf_dst,
- Uint8 * dstbuf, SDL_Rect * srcrect, unsigned alpha)
-{
- SDL_PixelFormat *fmt = surf_dst->format;
-
-#define RLECLIPBLIT(bpp, Type, do_blit) \
- do { \
- int linecount = srcrect->h; \
- int ofs = 0; \
- int left = srcrect->x; \
- int right = left + srcrect->w; \
- dstbuf -= left * bpp; \
- for (;;) { \
- int run; \
- ofs += *(Type *)srcbuf; \
- run = ((Type *)srcbuf)[1]; \
- srcbuf += 2 * sizeof(Type); \
- if (run) { \
- /* clip to left and right borders */ \
- if (ofs < right) { \
- int start = 0; \
- int len = run; \
- int startcol; \
- if (left - ofs > 0) { \
- start = left - ofs; \
- len -= start; \
- if (len <= 0) \
- goto nocopy ## bpp ## do_blit; \
- } \
- startcol = ofs + start; \
- if (len > right - startcol) \
- len = right - startcol; \
- do_blit(dstbuf + startcol * bpp, srcbuf + start * bpp, \
- len, bpp, alpha); \
- } \
- nocopy ## bpp ## do_blit: \
- srcbuf += run * bpp; \
- ofs += run; \
- } else if (!ofs) \
- break; \
- \
- if (ofs == w) { \
- ofs = 0; \
- dstbuf += surf_dst->pitch; \
- if (!--linecount) \
- break; \
- } \
- } \
- } while(0)
-
- CHOOSE_BLIT(RLECLIPBLIT, alpha, fmt);
-
-#undef RLECLIPBLIT
-
-}
-
-
-/* blit a colorkeyed RLE surface */
-int
-SDL_RLEBlit(SDL_Surface * surf_src, SDL_Rect * srcrect,
- SDL_Surface * surf_dst, SDL_Rect * dstrect)
-{
- Uint8 *dstbuf;
- Uint8 *srcbuf;
- int x, y;
- int w = surf_src->w;
- unsigned alpha;
-
- /* Lock the destination if necessary */
- if (SDL_MUSTLOCK(surf_dst)) {
- if (SDL_LockSurface(surf_dst) < 0) {
- return (-1);
- }
- }
-
- /* Set up the source and destination pointers */
- x = dstrect->x;
- y = dstrect->y;
- dstbuf = (Uint8 *) surf_dst->pixels
- + y * surf_dst->pitch + x * surf_src->format->BytesPerPixel;
- srcbuf = (Uint8 *) surf_src->map->data;
-
- {
- /* skip lines at the top if necessary */
- int vskip = srcrect->y;
- int ofs = 0;
- if (vskip) {
-
-#define RLESKIP(bpp, Type) \
- for(;;) { \
- int run; \
- ofs += *(Type *)srcbuf; \
- run = ((Type *)srcbuf)[1]; \
- srcbuf += sizeof(Type) * 2; \
- if(run) { \
- srcbuf += run * bpp; \
- ofs += run; \
- } else if(!ofs) \
- goto done; \
- if(ofs == w) { \
- ofs = 0; \
- if(!--vskip) \
- break; \
- } \
- }
-
- switch (surf_src->format->BytesPerPixel) {
- case 1:
- RLESKIP(1, Uint8);
- break;
- case 2:
- RLESKIP(2, Uint8);
- break;
- case 3:
- RLESKIP(3, Uint8);
- break;
- case 4:
- RLESKIP(4, Uint16);
- break;
- }
-
-#undef RLESKIP
-
- }
- }
-
- alpha = surf_src->map->info.a;
- /* if left or right edge clipping needed, call clip blit */
- if (srcrect->x || srcrect->w != surf_src->w) {
- RLEClipBlit(w, srcbuf, surf_dst, dstbuf, srcrect, alpha);
- } else {
- SDL_PixelFormat *fmt = surf_src->format;
-
-#define RLEBLIT(bpp, Type, do_blit) \
- do { \
- int linecount = srcrect->h; \
- int ofs = 0; \
- for(;;) { \
- unsigned run; \
- ofs += *(Type *)srcbuf; \
- run = ((Type *)srcbuf)[1]; \
- srcbuf += 2 * sizeof(Type); \
- if(run) { \
- do_blit(dstbuf + ofs * bpp, srcbuf, run, bpp, alpha); \
- srcbuf += run * bpp; \
- ofs += run; \
- } else if(!ofs) \
- break; \
- if(ofs == w) { \
- ofs = 0; \
- dstbuf += surf_dst->pitch; \
- if(!--linecount) \
- break; \
- } \
- } \
- } while(0)
-
- CHOOSE_BLIT(RLEBLIT, alpha, fmt);
-
-#undef RLEBLIT
- }
-
- done:
- /* Unlock the destination if necessary */
- if (SDL_MUSTLOCK(surf_dst)) {
- SDL_UnlockSurface(surf_dst);
- }
- return (0);
-}
-
-#undef OPAQUE_BLIT
-
-/*
- * Per-pixel blitting macros for translucent pixels:
- * These use the same techniques as the per-surface blitting macros
- */
-
-/*
- * For 32bpp pixels, we have made sure the alpha is stored in the top
- * 8 bits, so proceed as usual
- */
-#define BLIT_TRANSL_888(src, dst) \
- do { \
- Uint32 s = src; \
- Uint32 d = dst; \
- unsigned alpha = s >> 24; \
- Uint32 s1 = s & 0xff00ff; \
- Uint32 d1 = d & 0xff00ff; \
- d1 = (d1 + ((s1 - d1) * alpha >> 8)) & 0xff00ff; \
- s &= 0xff00; \
- d &= 0xff00; \
- d = (d + ((s - d) * alpha >> 8)) & 0xff00; \
- dst = d1 | d | 0xff000000; \
- } while(0)
-
-/*
- * For 16bpp pixels, we have stored the 5 most significant alpha bits in
- * bits 5-10. As before, we can process all 3 RGB components at the same time.
- */
-#define BLIT_TRANSL_565(src, dst) \
- do { \
- Uint32 s = src; \
- Uint32 d = dst; \
- unsigned alpha = (s & 0x3e0) >> 5; \
- s &= 0x07e0f81f; \
- d = (d | d << 16) & 0x07e0f81f; \
- d += (s - d) * alpha >> 5; \
- d &= 0x07e0f81f; \
- dst = (Uint16)(d | d >> 16); \
- } while(0)
-
-#define BLIT_TRANSL_555(src, dst) \
- do { \
- Uint32 s = src; \
- Uint32 d = dst; \
- unsigned alpha = (s & 0x3e0) >> 5; \
- s &= 0x03e07c1f; \
- d = (d | d << 16) & 0x03e07c1f; \
- d += (s - d) * alpha >> 5; \
- d &= 0x03e07c1f; \
- dst = (Uint16)(d | d >> 16); \
- } while(0)
-
-/* used to save the destination format in the encoding. Designed to be
- macro-compatible with SDL_PixelFormat but without the unneeded fields */
-typedef struct
-{
- Uint8 BytesPerPixel;
- Uint8 padding[3];
- Uint32 Rmask;
- Uint32 Gmask;
- Uint32 Bmask;
- Uint32 Amask;
- Uint8 Rloss;
- Uint8 Gloss;
- Uint8 Bloss;
- Uint8 Aloss;
- Uint8 Rshift;
- Uint8 Gshift;
- Uint8 Bshift;
- Uint8 Ashift;
-} RLEDestFormat;
-
-/* blit a pixel-alpha RLE surface clipped at the right and/or left edges */
-static void
-RLEAlphaClipBlit(int w, Uint8 * srcbuf, SDL_Surface * surf_dst,
- Uint8 * dstbuf, SDL_Rect * srcrect)
-{
- SDL_PixelFormat *df = surf_dst->format;
- /*
- * clipped blitter: Ptype is the destination pixel type,
- * Ctype the translucent count type, and do_blend the macro
- * to blend one pixel.
- */
-#define RLEALPHACLIPBLIT(Ptype, Ctype, do_blend) \
- do { \
- int linecount = srcrect->h; \
- int left = srcrect->x; \
- int right = left + srcrect->w; \
- dstbuf -= left * sizeof(Ptype); \
- do { \
- int ofs = 0; \
- /* blit opaque pixels on one line */ \
- do { \
- unsigned run; \
- ofs += ((Ctype *)srcbuf)[0]; \
- run = ((Ctype *)srcbuf)[1]; \
- srcbuf += 2 * sizeof(Ctype); \
- if(run) { \
- /* clip to left and right borders */ \
- int cofs = ofs; \
- int crun = run; \
- if(left - cofs > 0) { \
- crun -= left - cofs; \
- cofs = left; \
- } \
- if(crun > right - cofs) \
- crun = right - cofs; \
- if(crun > 0) \
- PIXEL_COPY(dstbuf + cofs * sizeof(Ptype), \
- srcbuf + (cofs - ofs) * sizeof(Ptype), \
- (unsigned)crun, sizeof(Ptype)); \
- srcbuf += run * sizeof(Ptype); \
- ofs += run; \
- } else if(!ofs) \
- return; \
- } while(ofs < w); \
- /* skip padding if necessary */ \
- if(sizeof(Ptype) == 2) \
- srcbuf += (uintptr_t)srcbuf & 2; \
- /* blit translucent pixels on the same line */ \
- ofs = 0; \
- do { \
- unsigned run; \
- ofs += ((Uint16 *)srcbuf)[0]; \
- run = ((Uint16 *)srcbuf)[1]; \
- srcbuf += 4; \
- if(run) { \
- /* clip to left and right borders */ \
- int cofs = ofs; \
- int crun = run; \
- if(left - cofs > 0) { \
- crun -= left - cofs; \
- cofs = left; \
- } \
- if(crun > right - cofs) \
- crun = right - cofs; \
- if(crun > 0) { \
- Ptype *dst = (Ptype *)dstbuf + cofs; \
- Uint32 *src = (Uint32 *)srcbuf + (cofs - ofs); \
- int i; \
- for(i = 0; i < crun; i++) \
- do_blend(src[i], dst[i]); \
- } \
- srcbuf += run * 4; \
- ofs += run; \
- } \
- } while(ofs < w); \
- dstbuf += surf_dst->pitch; \
- } while(--linecount); \
- } while(0)
-
- switch (df->BytesPerPixel) {
- case 2:
- if (df->Gmask == 0x07e0 || df->Rmask == 0x07e0 || df->Bmask == 0x07e0)
- RLEALPHACLIPBLIT(Uint16, Uint8, BLIT_TRANSL_565);
- else
- RLEALPHACLIPBLIT(Uint16, Uint8, BLIT_TRANSL_555);
- break;
- case 4:
- RLEALPHACLIPBLIT(Uint32, Uint16, BLIT_TRANSL_888);
- break;
- }
-}
-
-/* blit a pixel-alpha RLE surface */
-int
-SDL_RLEAlphaBlit(SDL_Surface * surf_src, SDL_Rect * srcrect,
- SDL_Surface * surf_dst, SDL_Rect * dstrect)
-{
- int x, y;
- int w = surf_src->w;
- Uint8 *srcbuf, *dstbuf;
- SDL_PixelFormat *df = surf_dst->format;
-
- /* Lock the destination if necessary */
- if (SDL_MUSTLOCK(surf_dst)) {
- if (SDL_LockSurface(surf_dst) < 0) {
- return -1;
- }
- }
-
- x = dstrect->x;
- y = dstrect->y;
- dstbuf = (Uint8 *) surf_dst->pixels + y * surf_dst->pitch + x * df->BytesPerPixel;
- srcbuf = (Uint8 *) surf_src->map->data + sizeof(RLEDestFormat);
-
- {
- /* skip lines at the top if necessary */
- int vskip = srcrect->y;
- if (vskip) {
- int ofs;
- if (df->BytesPerPixel == 2) {
- /* the 16/32 interleaved format */
- do {
- /* skip opaque line */
- ofs = 0;
- do {
- int run;
- ofs += srcbuf[0];
- run = srcbuf[1];
- srcbuf += 2;
- if (run) {
- srcbuf += 2 * run;
- ofs += run;
- } else if (!ofs)
- goto done;
- } while (ofs < w);
-
- /* skip padding */
- srcbuf += (uintptr_t) srcbuf & 2;
-
- /* skip translucent line */
- ofs = 0;
- do {
- int run;
- ofs += ((Uint16 *) srcbuf)[0];
- run = ((Uint16 *) srcbuf)[1];
- srcbuf += 4 * (run + 1);
- ofs += run;
- } while (ofs < w);
- } while (--vskip);
- } else {
- /* the 32/32 interleaved format */
- vskip <<= 1; /* opaque and translucent have same format */
- do {
- ofs = 0;
- do {
- int run;
- ofs += ((Uint16 *) srcbuf)[0];
- run = ((Uint16 *) srcbuf)[1];
- srcbuf += 4;
- if (run) {
- srcbuf += 4 * run;
- ofs += run;
- } else if (!ofs)
- goto done;
- } while (ofs < w);
- } while (--vskip);
- }
- }
- }
-
- /* if left or right edge clipping needed, call clip blit */
- if (srcrect->x || srcrect->w != surf_src->w) {
- RLEAlphaClipBlit(w, srcbuf, surf_dst, dstbuf, srcrect);
- } else {
-
- /*
- * non-clipped blitter. Ptype is the destination pixel type,
- * Ctype the translucent count type, and do_blend the
- * macro to blend one pixel.
- */
-#define RLEALPHABLIT(Ptype, Ctype, do_blend) \
- do { \
- int linecount = srcrect->h; \
- do { \
- int ofs = 0; \
- /* blit opaque pixels on one line */ \
- do { \
- unsigned run; \
- ofs += ((Ctype *)srcbuf)[0]; \
- run = ((Ctype *)srcbuf)[1]; \
- srcbuf += 2 * sizeof(Ctype); \
- if(run) { \
- PIXEL_COPY(dstbuf + ofs * sizeof(Ptype), srcbuf, \
- run, sizeof(Ptype)); \
- srcbuf += run * sizeof(Ptype); \
- ofs += run; \
- } else if(!ofs) \
- goto done; \
- } while(ofs < w); \
- /* skip padding if necessary */ \
- if(sizeof(Ptype) == 2) \
- srcbuf += (uintptr_t)srcbuf & 2; \
- /* blit translucent pixels on the same line */ \
- ofs = 0; \
- do { \
- unsigned run; \
- ofs += ((Uint16 *)srcbuf)[0]; \
- run = ((Uint16 *)srcbuf)[1]; \
- srcbuf += 4; \
- if(run) { \
- Ptype *dst = (Ptype *)dstbuf + ofs; \
- unsigned i; \
- for(i = 0; i < run; i++) { \
- Uint32 src = *(Uint32 *)srcbuf; \
- do_blend(src, *dst); \
- srcbuf += 4; \
- dst++; \
- } \
- ofs += run; \
- } \
- } while(ofs < w); \
- dstbuf += surf_dst->pitch; \
- } while(--linecount); \
- } while(0)
-
- switch (df->BytesPerPixel) {
- case 2:
- if (df->Gmask == 0x07e0 || df->Rmask == 0x07e0
- || df->Bmask == 0x07e0)
- RLEALPHABLIT(Uint16, Uint8, BLIT_TRANSL_565);
- else
- RLEALPHABLIT(Uint16, Uint8, BLIT_TRANSL_555);
- break;
- case 4:
- RLEALPHABLIT(Uint32, Uint16, BLIT_TRANSL_888);
- break;
- }
- }
-
- done:
- /* Unlock the destination if necessary */
- if (SDL_MUSTLOCK(surf_dst)) {
- SDL_UnlockSurface(surf_dst);
- }
- return 0;
-}
-
-/*
- * Auxiliary functions:
- * The encoding functions take 32bpp rgb + a, and
- * return the number of bytes copied to the destination.
- * The decoding functions copy to 32bpp rgb + a, and
- * return the number of bytes copied from the source.
- * These are only used in the encoder and un-RLE code and are therefore not
- * highly optimised.
- */
-
-/* encode 32bpp rgb + a into 16bpp rgb, losing alpha */
-static int
-copy_opaque_16(void *dst, Uint32 * src, int n,
- SDL_PixelFormat * sfmt, SDL_PixelFormat * dfmt)
-{
- int i;
- Uint16 *d = dst;
- for (i = 0; i < n; i++) {
- unsigned r, g, b;
- RGB_FROM_PIXEL(*src, sfmt, r, g, b);
- PIXEL_FROM_RGB(*d, dfmt, r, g, b);
- src++;
- d++;
- }
- return n * 2;
-}
-
-/* decode opaque pixels from 16bpp to 32bpp rgb + a */
-static int
-uncopy_opaque_16(Uint32 * dst, void *src, int n,
- RLEDestFormat * sfmt, SDL_PixelFormat * dfmt)
-{
- int i;
- Uint16 *s = src;
- unsigned alpha = dfmt->Amask ? 255 : 0;
- for (i = 0; i < n; i++) {
- unsigned r, g, b;
- RGB_FROM_PIXEL(*s, sfmt, r, g, b);
- PIXEL_FROM_RGBA(*dst, dfmt, r, g, b, alpha);
- s++;
- dst++;
- }
- return n * 2;
-}
-
-
-
-/* encode 32bpp rgb + a into 32bpp G0RAB format for blitting into 565 */
-static int
-copy_transl_565(void *dst, Uint32 * src, int n,
- SDL_PixelFormat * sfmt, SDL_PixelFormat * dfmt)
-{
- int i;
- Uint32 *d = dst;
- for (i = 0; i < n; i++) {
- unsigned r, g, b, a;
- Uint16 pix;
- RGBA_FROM_8888(*src, sfmt, r, g, b, a);
- PIXEL_FROM_RGB(pix, dfmt, r, g, b);
- *d = ((pix & 0x7e0) << 16) | (pix & 0xf81f) | ((a << 2) & 0x7e0);
- src++;
- d++;
- }
- return n * 4;
-}
-
-/* encode 32bpp rgb + a into 32bpp G0RAB format for blitting into 555 */
-static int
-copy_transl_555(void *dst, Uint32 * src, int n,
- SDL_PixelFormat * sfmt, SDL_PixelFormat * dfmt)
-{
- int i;
- Uint32 *d = dst;
- for (i = 0; i < n; i++) {
- unsigned r, g, b, a;
- Uint16 pix;
- RGBA_FROM_8888(*src, sfmt, r, g, b, a);
- PIXEL_FROM_RGB(pix, dfmt, r, g, b);
- *d = ((pix & 0x3e0) << 16) | (pix & 0xfc1f) | ((a << 2) & 0x3e0);
- src++;
- d++;
- }
- return n * 4;
-}
-
-/* decode translucent pixels from 32bpp GORAB to 32bpp rgb + a */
-static int
-uncopy_transl_16(Uint32 * dst, void *src, int n,
- RLEDestFormat * sfmt, SDL_PixelFormat * dfmt)
-{
- int i;
- Uint32 *s = src;
- for (i = 0; i < n; i++) {
- unsigned r, g, b, a;
- Uint32 pix = *s++;
- a = (pix & 0x3e0) >> 2;
- pix = (pix & ~0x3e0) | pix >> 16;
- RGB_FROM_PIXEL(pix, sfmt, r, g, b);
- PIXEL_FROM_RGBA(*dst, dfmt, r, g, b, a);
- dst++;
- }
- return n * 4;
-}
-
-/* encode 32bpp rgba into 32bpp rgba, keeping alpha (dual purpose) */
-static int
-copy_32(void *dst, Uint32 * src, int n,
- SDL_PixelFormat * sfmt, SDL_PixelFormat * dfmt)
-{
- int i;
- Uint32 *d = dst;
- for (i = 0; i < n; i++) {
- unsigned r, g, b, a;
- RGBA_FROM_8888(*src, sfmt, r, g, b, a);
- RLEPIXEL_FROM_RGBA(*d, dfmt, r, g, b, a);
- d++;
- src++;
- }
- return n * 4;
-}
-
-/* decode 32bpp rgba into 32bpp rgba, keeping alpha (dual purpose) */
-static int
-uncopy_32(Uint32 * dst, void *src, int n,
- RLEDestFormat * sfmt, SDL_PixelFormat * dfmt)
-{
- int i;
- Uint32 *s = src;
- for (i = 0; i < n; i++) {
- unsigned r, g, b, a;
- Uint32 pixel = *s++;
- RGB_FROM_PIXEL(pixel, sfmt, r, g, b);
- a = pixel >> 24;
- PIXEL_FROM_RGBA(*dst, dfmt, r, g, b, a);
- dst++;
- }
- return n * 4;
-}
-
-#define ISOPAQUE(pixel, fmt) ((((pixel) & fmt->Amask) >> fmt->Ashift) == 255)
-
-#define ISTRANSL(pixel, fmt) \
- ((unsigned)((((pixel) & fmt->Amask) >> fmt->Ashift) - 1U) < 254U)
-
-/* convert surface to be quickly alpha-blittable onto dest, if possible */
-static int
-RLEAlphaSurface(SDL_Surface * surface)
-{
- SDL_Surface *dest;
- SDL_PixelFormat *df;
- int maxsize = 0;
- int max_opaque_run;
- int max_transl_run = 65535;
- unsigned masksum;
- Uint8 *rlebuf, *dst;
- int (*copy_opaque) (void *, Uint32 *, int,
- SDL_PixelFormat *, SDL_PixelFormat *);
- int (*copy_transl) (void *, Uint32 *, int,
- SDL_PixelFormat *, SDL_PixelFormat *);
-
- dest = surface->map->dst;
- if (!dest)
- return -1;
- df = dest->format;
- if (surface->format->BitsPerPixel != 32)
- return -1; /* only 32bpp source supported */
-
- /* find out whether the destination is one we support,
- and determine the max size of the encoded result */
- masksum = df->Rmask | df->Gmask | df->Bmask;
- switch (df->BytesPerPixel) {
- case 2:
- /* 16bpp: only support 565 and 555 formats */
- switch (masksum) {
- case 0xffff:
- if (df->Gmask == 0x07e0
- || df->Rmask == 0x07e0 || df->Bmask == 0x07e0) {
- copy_opaque = copy_opaque_16;
- copy_transl = copy_transl_565;
- } else
- return -1;
- break;
- case 0x7fff:
- if (df->Gmask == 0x03e0
- || df->Rmask == 0x03e0 || df->Bmask == 0x03e0) {
- copy_opaque = copy_opaque_16;
- copy_transl = copy_transl_555;
- } else
- return -1;
- break;
- default:
- return -1;
- }
- max_opaque_run = 255; /* runs stored as bytes */
-
- /* worst case is alternating opaque and translucent pixels,
- with room for alignment padding between lines */
- maxsize = surface->h * (2 + (4 + 2) * (surface->w + 1)) + 2;
- break;
- case 4:
- if (masksum != 0x00ffffff)
- return -1; /* requires unused high byte */
- copy_opaque = copy_32;
- copy_transl = copy_32;
- max_opaque_run = 255; /* runs stored as short ints */
-
- /* worst case is alternating opaque and translucent pixels */
- maxsize = surface->h * 2 * 4 * (surface->w + 1) + 4;
- break;
- default:
- return -1; /* anything else unsupported right now */
- }
-
- maxsize += sizeof(RLEDestFormat);
- rlebuf = (Uint8 *) SDL_malloc(maxsize);
- if (!rlebuf) {
- return SDL_OutOfMemory();
- }
- {
- /* save the destination format so we can undo the encoding later */
- RLEDestFormat *r = (RLEDestFormat *) rlebuf;
- r->BytesPerPixel = df->BytesPerPixel;
- r->Rmask = df->Rmask;
- r->Gmask = df->Gmask;
- r->Bmask = df->Bmask;
- r->Amask = df->Amask;
- r->Rloss = df->Rloss;
- r->Gloss = df->Gloss;
- r->Bloss = df->Bloss;
- r->Aloss = df->Aloss;
- r->Rshift = df->Rshift;
- r->Gshift = df->Gshift;
- r->Bshift = df->Bshift;
- r->Ashift = df->Ashift;
- }
- dst = rlebuf + sizeof(RLEDestFormat);
-
- /* Do the actual encoding */
- {
- int x, y;
- int h = surface->h, w = surface->w;
- SDL_PixelFormat *sf = surface->format;
- Uint32 *src = (Uint32 *) surface->pixels;
- Uint8 *lastline = dst; /* end of last non-blank line */
-
- /* opaque counts are 8 or 16 bits, depending on target depth */
-#define ADD_OPAQUE_COUNTS(n, m) \
- if(df->BytesPerPixel == 4) { \
- ((Uint16 *)dst)[0] = n; \
- ((Uint16 *)dst)[1] = m; \
- dst += 4; \
- } else { \
- dst[0] = n; \
- dst[1] = m; \
- dst += 2; \
- }
-
- /* translucent counts are always 16 bit */
-#define ADD_TRANSL_COUNTS(n, m) \
- (((Uint16 *)dst)[0] = n, ((Uint16 *)dst)[1] = m, dst += 4)
-
- for (y = 0; y < h; y++) {
- int runstart, skipstart;
- int blankline = 0;
- /* First encode all opaque pixels of a scan line */
- x = 0;
- do {
- int run, skip, len;
- skipstart = x;
- while (x < w && !ISOPAQUE(src[x], sf))
- x++;
- runstart = x;
- while (x < w && ISOPAQUE(src[x], sf))
- x++;
- skip = runstart - skipstart;
- if (skip == w)
- blankline = 1;
- run = x - runstart;
- while (skip > max_opaque_run) {
- ADD_OPAQUE_COUNTS(max_opaque_run, 0);
- skip -= max_opaque_run;
- }
- len = MIN(run, max_opaque_run);
- ADD_OPAQUE_COUNTS(skip, len);
- dst += copy_opaque(dst, src + runstart, len, sf, df);
- runstart += len;
- run -= len;
- while (run) {
- len = MIN(run, max_opaque_run);
- ADD_OPAQUE_COUNTS(0, len);
- dst += copy_opaque(dst, src + runstart, len, sf, df);
- runstart += len;
- run -= len;
- }
- } while (x < w);
-
- /* Make sure the next output address is 32-bit aligned */
- dst += (uintptr_t) dst & 2;
-
- /* Next, encode all translucent pixels of the same scan line */
- x = 0;
- do {
- int run, skip, len;
- skipstart = x;
- while (x < w && !ISTRANSL(src[x], sf))
- x++;
- runstart = x;
- while (x < w && ISTRANSL(src[x], sf))
- x++;
- skip = runstart - skipstart;
- blankline &= (skip == w);
- run = x - runstart;
- while (skip > max_transl_run) {
- ADD_TRANSL_COUNTS(max_transl_run, 0);
- skip -= max_transl_run;
- }
- len = MIN(run, max_transl_run);
- ADD_TRANSL_COUNTS(skip, len);
- dst += copy_transl(dst, src + runstart, len, sf, df);
- runstart += len;
- run -= len;
- while (run) {
- len = MIN(run, max_transl_run);
- ADD_TRANSL_COUNTS(0, len);
- dst += copy_transl(dst, src + runstart, len, sf, df);
- runstart += len;
- run -= len;
- }
- if (!blankline)
- lastline = dst;
- } while (x < w);
-
- src += surface->pitch >> 2;
- }
- dst = lastline; /* back up past trailing blank lines */
- ADD_OPAQUE_COUNTS(0, 0);
- }
-
-#undef ADD_OPAQUE_COUNTS
-#undef ADD_TRANSL_COUNTS
-
- /* Now that we have it encoded, release the original pixels */
- if (!(surface->flags & SDL_PREALLOC)) {
- SDL_free(surface->pixels);
- surface->pixels = NULL;
- }
-
- /* realloc the buffer to release unused memory */
- {
- Uint8 *p = SDL_realloc(rlebuf, dst - rlebuf);
- if (!p)
- p = rlebuf;
- surface->map->data = p;
- }
-
- return 0;
-}
-
-static Uint32
-getpix_8(Uint8 * srcbuf)
-{
- return *srcbuf;
-}
-
-static Uint32
-getpix_16(Uint8 * srcbuf)
-{
- return *(Uint16 *) srcbuf;
-}
-
-static Uint32
-getpix_24(Uint8 * srcbuf)
-{
-#if SDL_BYTEORDER == SDL_LIL_ENDIAN
- return srcbuf[0] + (srcbuf[1] << 8) + (srcbuf[2] << 16);
-#else
- return (srcbuf[0] << 16) + (srcbuf[1] << 8) + srcbuf[2];
-#endif
-}
-
-static Uint32
-getpix_32(Uint8 * srcbuf)
-{
- return *(Uint32 *) srcbuf;
-}
-
-typedef Uint32(*getpix_func) (Uint8 *);
-
-static const getpix_func getpixes[4] = {
- getpix_8, getpix_16, getpix_24, getpix_32
-};
-
-static int
-RLEColorkeySurface(SDL_Surface * surface)
-{
- Uint8 *rlebuf, *dst;
- int maxn;
- int y;
- Uint8 *srcbuf, *lastline;
- int maxsize = 0;
- int bpp = surface->format->BytesPerPixel;
- getpix_func getpix;
- Uint32 ckey, rgbmask;
- int w, h;
-
- /* calculate the worst case size for the compressed surface */
- switch (bpp) {
- case 1:
- /* worst case is alternating opaque and transparent pixels,
- starting with an opaque pixel */
- maxsize = surface->h * 3 * (surface->w / 2 + 1) + 2;
- break;
- case 2:
- case 3:
- /* worst case is solid runs, at most 255 pixels wide */
- maxsize = surface->h * (2 * (surface->w / 255 + 1)
- + surface->w * bpp) + 2;
- break;
- case 4:
- /* worst case is solid runs, at most 65535 pixels wide */
- maxsize = surface->h * (4 * (surface->w / 65535 + 1)
- + surface->w * 4) + 4;
- break;
- }
-
- rlebuf = (Uint8 *) SDL_malloc(maxsize);
- if (rlebuf == NULL) {
- return SDL_OutOfMemory();
- }
-
- /* Set up the conversion */
- srcbuf = (Uint8 *) surface->pixels;
- maxn = bpp == 4 ? 65535 : 255;
- dst = rlebuf;
- rgbmask = ~surface->format->Amask;
- ckey = surface->map->info.colorkey & rgbmask;
- lastline = dst;
- getpix = getpixes[bpp - 1];
- w = surface->w;
- h = surface->h;
-
-#define ADD_COUNTS(n, m) \
- if(bpp == 4) { \
- ((Uint16 *)dst)[0] = n; \
- ((Uint16 *)dst)[1] = m; \
- dst += 4; \
- } else { \
- dst[0] = n; \
- dst[1] = m; \
- dst += 2; \
- }
-
- for (y = 0; y < h; y++) {
- int x = 0;
- int blankline = 0;
- do {
- int run, skip, len;
- int runstart;
- int skipstart = x;
-
- /* find run of transparent, then opaque pixels */
- while (x < w && (getpix(srcbuf + x * bpp) & rgbmask) == ckey)
- x++;
- runstart = x;
- while (x < w && (getpix(srcbuf + x * bpp) & rgbmask) != ckey)
- x++;
- skip = runstart - skipstart;
- if (skip == w)
- blankline = 1;
- run = x - runstart;
-
- /* encode segment */
- while (skip > maxn) {
- ADD_COUNTS(maxn, 0);
- skip -= maxn;
- }
- len = MIN(run, maxn);
- ADD_COUNTS(skip, len);
- SDL_memcpy(dst, srcbuf + runstart * bpp, len * bpp);
- dst += len * bpp;
- run -= len;
- runstart += len;
- while (run) {
- len = MIN(run, maxn);
- ADD_COUNTS(0, len);
- SDL_memcpy(dst, srcbuf + runstart * bpp, len * bpp);
- dst += len * bpp;
- runstart += len;
- run -= len;
- }
- if (!blankline)
- lastline = dst;
- } while (x < w);
-
- srcbuf += surface->pitch;
- }
- dst = lastline; /* back up bast trailing blank lines */
- ADD_COUNTS(0, 0);
-
-#undef ADD_COUNTS
-
- /* Now that we have it encoded, release the original pixels */
- if (!(surface->flags & SDL_PREALLOC)) {
- SDL_free(surface->pixels);
- surface->pixels = NULL;
- }
-
- /* realloc the buffer to release unused memory */
- {
- /* If realloc returns NULL, the original block is left intact */
- Uint8 *p = SDL_realloc(rlebuf, dst - rlebuf);
- if (!p)
- p = rlebuf;
- surface->map->data = p;
- }
-
- return (0);
-}
-
-int
-SDL_RLESurface(SDL_Surface * surface)
-{
- int flags;
-
- /* Clear any previous RLE conversion */
- if ((surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL) {
- SDL_UnRLESurface(surface, 1);
- }
-
- /* We don't support RLE encoding of bitmaps */
- if (surface->format->BitsPerPixel < 8) {
- return -1;
- }
-
- /* Make sure the pixels are available */
- if (!surface->pixels) {
- return -1;
- }
-
- /* If we don't have colorkey or blending, nothing to do... */
- flags = surface->map->info.flags;
- if (!(flags & (SDL_COPY_COLORKEY | SDL_COPY_BLEND))) {
- return -1;
- }
-
- /* Pass on combinations not supported */
- if ((flags & SDL_COPY_MODULATE_COLOR) ||
- ((flags & SDL_COPY_MODULATE_ALPHA) && surface->format->Amask) ||
- (flags & (SDL_COPY_ADD | SDL_COPY_MOD)) ||
- (flags & SDL_COPY_NEAREST)) {
- return -1;
- }
-
- /* Encode and set up the blit */
- if (!surface->format->Amask || !(flags & SDL_COPY_BLEND)) {
- if (!surface->map->identity) {
- return -1;
- }
- if (RLEColorkeySurface(surface) < 0) {
- return -1;
- }
- surface->map->blit = SDL_RLEBlit;
- surface->map->info.flags |= SDL_COPY_RLE_COLORKEY;
- } else {
- if (RLEAlphaSurface(surface) < 0) {
- return -1;
- }
- surface->map->blit = SDL_RLEAlphaBlit;
- surface->map->info.flags |= SDL_COPY_RLE_ALPHAKEY;
- }
-
- /* The surface is now accelerated */
- surface->flags |= SDL_RLEACCEL;
-
- return (0);
-}
-
-/*
- * Un-RLE a surface with pixel alpha
- * This may not give back exactly the image before RLE-encoding; all
- * completely transparent pixels will be lost, and color and alpha depth
- * may have been reduced (when encoding for 16bpp targets).
- */
-static SDL_bool
-UnRLEAlpha(SDL_Surface * surface)
-{
- Uint8 *srcbuf;
- Uint32 *dst;
- SDL_PixelFormat *sf = surface->format;
- RLEDestFormat *df = surface->map->data;
- int (*uncopy_opaque) (Uint32 *, void *, int,
- RLEDestFormat *, SDL_PixelFormat *);
- int (*uncopy_transl) (Uint32 *, void *, int,
- RLEDestFormat *, SDL_PixelFormat *);
- int w = surface->w;
- int bpp = df->BytesPerPixel;
-
- if (bpp == 2) {
- uncopy_opaque = uncopy_opaque_16;
- uncopy_transl = uncopy_transl_16;
- } else {
- uncopy_opaque = uncopy_transl = uncopy_32;
- }
-
- surface->pixels = SDL_malloc(surface->h * surface->pitch);
- if (!surface->pixels) {
- return (SDL_FALSE);
- }
- /* fill background with transparent pixels */
- SDL_memset(surface->pixels, 0, surface->h * surface->pitch);
-
- dst = surface->pixels;
- srcbuf = (Uint8 *) (df + 1);
- for (;;) {
- /* copy opaque pixels */
- int ofs = 0;
- do {
- unsigned run;
- if (bpp == 2) {
- ofs += srcbuf[0];
- run = srcbuf[1];
- srcbuf += 2;
- } else {
- ofs += ((Uint16 *) srcbuf)[0];
- run = ((Uint16 *) srcbuf)[1];
- srcbuf += 4;
- }
- if (run) {
- srcbuf += uncopy_opaque(dst + ofs, srcbuf, run, df, sf);
- ofs += run;
- } else if (!ofs)
- return (SDL_TRUE);
- } while (ofs < w);
-
- /* skip padding if needed */
- if (bpp == 2)
- srcbuf += (uintptr_t) srcbuf & 2;
-
- /* copy translucent pixels */
- ofs = 0;
- do {
- unsigned run;
- ofs += ((Uint16 *) srcbuf)[0];
- run = ((Uint16 *) srcbuf)[1];
- srcbuf += 4;
- if (run) {
- srcbuf += uncopy_transl(dst + ofs, srcbuf, run, df, sf);
- ofs += run;
- }
- } while (ofs < w);
- dst += surface->pitch >> 2;
- }
- /* Make the compiler happy */
- return (SDL_TRUE);
-}
-
-void
-SDL_UnRLESurface(SDL_Surface * surface, int recode)
-{
- if (surface->flags & SDL_RLEACCEL) {
- surface->flags &= ~SDL_RLEACCEL;
-
- if (recode && !(surface->flags & SDL_PREALLOC)) {
- if (surface->map->info.flags & SDL_COPY_RLE_COLORKEY) {
- SDL_Rect full;
-
- /* re-create the original surface */
- surface->pixels = SDL_malloc(surface->h * surface->pitch);
- if (!surface->pixels) {
- /* Oh crap... */
- surface->flags |= SDL_RLEACCEL;
- return;
- }
-
- /* fill it with the background color */
- SDL_FillRect(surface, NULL, surface->map->info.colorkey);
-
- /* now render the encoded surface */
- full.x = full.y = 0;
- full.w = surface->w;
- full.h = surface->h;
- SDL_RLEBlit(surface, &full, surface, &full);
- } else {
- if (!UnRLEAlpha(surface)) {
- /* Oh crap... */
- surface->flags |= SDL_RLEACCEL;
- return;
- }
- }
- }
- surface->map->info.flags &=
- ~(SDL_COPY_RLE_COLORKEY | SDL_COPY_RLE_ALPHAKEY);
-
- SDL_free(surface->map->data);
- surface->map->data = NULL;
- }
-}
-
-/* vi: set ts=4 sw=4 expandtab: */