Mercurial > sdl-ios-xcode
view src/video/SDL_RLEaccel.c @ 5067:61d53410eb41
Fixed bug #859
CREATE_SUBDIRS helps a lot if browsing HTML documentation in a file browser.
ALWAYS_DETAILED_SEC makes sure everything has at least the automatic
documentation like function prototype and source references.
STRIP_FROM_PATH allows you to include only the relevant portions of the files'
paths, cleaning up both the file list and directory tree, though you need to
change the path listed here to match wherever you put SDL.
ALIASES avoids some warnings generated by
C:\source\svn.libsdl.org\trunk\SDL\src\joystick\darwin\10.3.9-FIX\IOHIDLib.h.
It seems Apple uses a few commands which are not normally supported by Doxygen.
BUILTIN_STL_SUPPORT adds support for parsing code which makes use of the
standard template library. There isn't a lot of C++ in SDL (some in bwindow at
least), but this still seems like a good idea.
TYPEDEF_HIDES_STRUCT means that for code like this:
typedef struct A {int B;} C;
C is documented as a structure containing B instead of a typedef mapped to A.
EXTRACT_ALL, EXTRACT_PRIVATE, EXTRACT_STATIC, EXTRACT_LOCAL_METHODS,
EXTRACT_ANON_NSPACES and INTERNAL_DOCS make sure that _everything_ is
documented.
CASE_SENSE_NAMES = NO avoids potential conflicts when building documentation on
case insensitive file systems like NTFS and FAT32.
WARN_NO_PARAMDOC lets you know when you have documented some, but not all, of
the parameters of a function. This is useful when you're working on adding
such documentation since it makes partially documented functions easier to
spot.
WARN_LOGFILE writes warnings to a seperate file instead of mixing them in with
stdout. When not running in quiet mode, these warnings can be hard to spot
without this flag.
I added *.h.in and *.h.default to FILE_PATTERNS to generate documentation for
config.h.in and config.h.default.
RECURSIVE tells doxygen to look not only in the input directory, but also in
subfolders.
EXCLUDE avoids documenting things like test programs, examples and templates
which need to be documented separately.
I've used EXCLUDE_PATTERNS to exclude non-source subdirectories that often find
their way into source folders (such as obj or .svn).
EXAMPLE_PATH lists directories doxygen will search to find included example
code. So far, SDL doesn't really use this feature, but I've listed some likely
locations.
SOURCE_BROWSER adds syntax highlighted source code to the HTML output.
USE_HTAGS is nice, but not available on Windows.
INLINE_SOURCES adds the body of a function to it's documentation so you can
quickly see exactly what it does.
ALPHABETICAL_INDEX generates an alphabetical list of all structures, functions,
etc., which makes it much easier to find what you're looking for.
IGNORE_PREFIX skips the SDL_ prefix when deciding which index page to place an
item on so you don't have everything show up under "S".
HTML_DYNAMIC_SECTIONS hides the includes/included by diagrams by default and
adds JavaScript to allow the user to show and hide them by clicking a link.
ENUM_VALUES_PER_LINE = 1 makes enums easier to read by placing each value on
it's own line.
GENERATE_TREEVIEW produces a two frame index page with a navigation tree on the
left.
I have LaTeX and man pages turned off to speed up doxygen, you may want to turn
them back on yourself.
I added _WIN32=1 to PREDEFINED to cause SDL to output documentation related to
Win32 builds of SDL. Normally, doxygen gets confused since there are multiple
definitions for various structures and formats that vary by platform. Without
this doxygen can produce broken documentation or, if you're lucky, output
documentation only for the dummy drivers, which isn't very useful. You need to
pick a platform.
GENERATE_TAGFILE produces a file which can be used to link other doxygen
documentation to the SDL documentation.
CLASS_DIAGRAMS turns on class diagrams even when dot is not available.
HAVE_DOT tells doxygen to try to use dot to generate diagrams.
TEMPLATE_RELATIONS and INCLUDE_GRAPH add additional diagrams to the
documentation.
DOT_MULTI_TARGETS speeds up dot.
OUTPUT_DIRECTORY, INPUT and other paths reflect the fact that this Doxyfile is
intended to process src as well as include and is being run from a separate
subdirectory. Doxygen produces several temporary files while it's running and
if interrupted, can leave those files behind. It's easier to clean up if there
aren't a hundred or so files in the same folder. I typically run doxygen in
SDL/doxy and set the output directory to '.'. Since doxygen puts it's output
in subfolders by type, this keeps things pretty well organised. You could use
'../doc' instead and get the same results.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Fri, 21 Jan 2011 12:57:01 -0800 |
| parents | f7b03b6838cb |
| children | e743b9c3f6d6 |
line wrap: on
line source
/* SDL - Simple DirectMedia Layer Copyright (C) 1997-2010 Sam Lantinga This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA Sam Lantinga slouken@libsdl.org */ #include "SDL_config.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) \ do { \ if(bpp == 4) { \ SDL_memcpy4(to, from, (size_t)(len)); \ } else { \ SDL_memcpy(to, from, (size_t)(len) * (bpp)); \ } \ } while(0) /* * 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; \ } \ /* fallthrough */ \ \ 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) /* * 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 * dst, Uint8 * dstbuf, SDL_Rect * srcrect, unsigned alpha) { SDL_PixelFormat *fmt = 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 += dst->pitch; \ if(!--linecount) \ break; \ } \ } \ } while(0) CHOOSE_BLIT(RLECLIPBLIT, alpha, fmt); #undef RLECLIPBLIT } /* blit a colorkeyed RLE surface */ int SDL_RLEBlit(SDL_Surface * src, SDL_Rect * srcrect, SDL_Surface * dst, SDL_Rect * dstrect) { Uint8 *dstbuf; Uint8 *srcbuf; int x, y; int w = src->w; unsigned alpha; /* Lock the destination if necessary */ if (SDL_MUSTLOCK(dst)) { if (SDL_LockSurface(dst) < 0) { return (-1); } } /* Set up the source and destination pointers */ x = dstrect->x; y = dstrect->y; dstbuf = (Uint8 *) dst->pixels + y * dst->pitch + x * src->format->BytesPerPixel; srcbuf = (Uint8 *) src->map->data; { /* skip lines at the top if neccessary */ 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 (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 = src->map->info.a; /* if left or right edge clipping needed, call clip blit */ if (srcrect->x || srcrect->w != src->w) { RLEClipBlit(w, srcbuf, dst, dstbuf, srcrect, alpha); } else { SDL_PixelFormat *fmt = 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 += dst->pitch; \ if(!--linecount) \ break; \ } \ } \ } while(0) CHOOSE_BLIT(RLEBLIT, alpha, fmt); #undef RLEBLIT } done: /* Unlock the destination if necessary */ if (SDL_MUSTLOCK(dst)) { SDL_UnlockSurface(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 Rloss; Uint8 Gloss; Uint8 Bloss; Uint8 Rshift; Uint8 Gshift; Uint8 Bshift; Uint8 Ashift; Uint32 Rmask; Uint32 Gmask; Uint32 Bmask; Uint32 Amask; } RLEDestFormat; /* blit a pixel-alpha RLE surface clipped at the right and/or left edges */ static void RLEAlphaClipBlit(int w, Uint8 * srcbuf, SDL_Surface * dst, Uint8 * dstbuf, SDL_Rect * srcrect) { SDL_PixelFormat *df = 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 += 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 * src, SDL_Rect * srcrect, SDL_Surface * dst, SDL_Rect * dstrect) { int x, y; int w = src->w; Uint8 *srcbuf, *dstbuf; SDL_PixelFormat *df = dst->format; /* Lock the destination if necessary */ if (SDL_MUSTLOCK(dst)) { if (SDL_LockSurface(dst) < 0) { return -1; } } x = dstrect->x; y = dstrect->y; dstbuf = (Uint8 *) dst->pixels + y * dst->pitch + x * df->BytesPerPixel; srcbuf = (Uint8 *) 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 != src->w) { RLEAlphaClipBlit(w, srcbuf, 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 += 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(dst)) { SDL_UnlockSurface(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; Uint32 pixel; RGBA_FROM_8888(*src, sfmt, r, g, b, a); PIXEL_FROM_RGB(pixel, dfmt, r, g, b); *d++ = pixel | a << 24; 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) { SDL_OutOfMemory(); return -1; } { /* save the destination format so we can undo the encoding later */ RLEDestFormat *r = (RLEDestFormat *) rlebuf; r->BytesPerPixel = df->BytesPerPixel; r->Rloss = df->Rloss; r->Gloss = df->Gloss; r->Bloss = df->Bloss; r->Rshift = df->Rshift; r->Gshift = df->Gshift; r->Bshift = df->Bshift; r->Ashift = df->Ashift; r->Rmask = df->Rmask; r->Gmask = df->Gmask; r->Bmask = df->Bmask; r->Amask = df->Amask; } 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, *curbuf, *lastline; int maxsize = 0; int skip, run; 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) { SDL_OutOfMemory(); return (-1); } /* Set up the conversion */ srcbuf = (Uint8 *) surface->pixels; curbuf = srcbuf; maxn = bpp == 4 ? 65535 : 255; skip = run = 0; 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 colour 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 colour */ 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); if (surface->map->data) { SDL_free(surface->map->data); surface->map->data = NULL; } } } /* vi: set ts=4 sw=4 expandtab: */