Made the RLE code (semi) readable again
Sam Lantinga
parent
b4deeeba05
commit
a8955f2640
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@ -119,7 +119,7 @@
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int i; \
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Uint32 *src = (Uint32 *)(from); \
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Uint32 *dst = (Uint32 *)(to); \
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for(i = 0; i < (int)(length); i++) { \
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for (i = 0; i < (int)(length); i++) { \
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Uint32 s = *src++; \
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Uint32 d = *dst; \
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Uint32 s1 = s & 0xff00ff; \
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@ -130,7 +130,7 @@
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d = (d + ((s - d) * alpha >> 8)) & 0xff00; \
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*dst++ = d1 | d; \
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} \
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} while(0)
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} while (0)
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/*
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* For 16bpp pixels we can go a step further: put the middle component
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@ -180,16 +180,16 @@
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int i; \
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Uint8 *src = from; \
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Uint8 *dst = to; \
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for(i = 0; i < (int)(length); i++) { \
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for (i = 0; i < (int)(length); i++) { \
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Uint32 s, d; \
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unsigned rs, gs, bs, rd, gd, bd; \
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switch(bpp) { \
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switch (bpp) { \
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case 2: \
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s = *(Uint16 *)src; \
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d = *(Uint16 *)dst; \
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break; \
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case 3: \
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if(SDL_BYTEORDER == SDL_BIG_ENDIAN) { \
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if (SDL_BYTEORDER == SDL_BIG_ENDIAN) { \
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s = (src[0] << 16) | (src[1] << 8) | src[2]; \
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d = (dst[0] << 16) | (dst[1] << 8) | dst[2]; \
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} else { \
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@ -208,12 +208,12 @@
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gd += (gs - gd) * alpha >> 8; \
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bd += (bs - bd) * alpha >> 8; \
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PIXEL_FROM_RGB(d, fmt, rd, gd, bd); \
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switch(bpp) { \
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switch (bpp) { \
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case 2: \
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*(Uint16 *)dst = (Uint16)d; \
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break; \
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case 3: \
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if(SDL_BYTEORDER == SDL_BIG_ENDIAN) { \
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if (SDL_BYTEORDER == SDL_BIG_ENDIAN) { \
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dst[0] = (Uint8)(d >> 16); \
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dst[1] = (Uint8)(d >> 8); \
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dst[2] = (Uint8)(d); \
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@ -273,17 +273,17 @@
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unsigned n = (length); \
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Uint16 *src = (Uint16 *)(from); \
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Uint16 *dst = (Uint16 *)(to); \
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if(((uintptr_t)src ^ (uintptr_t)dst) & 3) { \
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if (((uintptr_t)src ^ (uintptr_t)dst) & 3) { \
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/* source and destination not in phase, blit one by one */ \
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while(n--) \
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while (n--) \
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BLEND16_50(dst, src, mask); \
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} else { \
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if((uintptr_t)src & 3) { \
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if ((uintptr_t)src & 3) { \
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/* first odd pixel */ \
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BLEND16_50(dst, src, mask); \
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n--; \
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} \
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for(; n > 1; n -= 2) { \
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for (; n > 1; n -= 2) { \
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Uint32 s = *(Uint32 *)src; \
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Uint32 d = *(Uint32 *)dst; \
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*(Uint32 *)dst = ((s & (mask | mask << 16)) >> 1) \
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@ -292,7 +292,7 @@
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src += 2; \
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dst += 2; \
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} \
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if(n) \
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if (n) \
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BLEND16_50(dst, src, mask); /* last odd pixel */ \
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} \
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} while(0)
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@ -305,28 +305,28 @@
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#define CHOOSE_BLIT(blitter, alpha, fmt) \
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do { \
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if(alpha == 255) { \
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switch(fmt->BytesPerPixel) { \
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if (alpha == 255) { \
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switch (fmt->BytesPerPixel) { \
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case 1: blitter(1, Uint8, OPAQUE_BLIT); break; \
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case 2: blitter(2, Uint8, OPAQUE_BLIT); break; \
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case 3: blitter(3, Uint8, OPAQUE_BLIT); break; \
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case 4: blitter(4, Uint16, OPAQUE_BLIT); break; \
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} \
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} else { \
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switch(fmt->BytesPerPixel) { \
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switch (fmt->BytesPerPixel) { \
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case 1: \
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/* No 8bpp alpha blitting */ \
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break; \
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\
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case 2: \
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switch(fmt->Rmask | fmt->Gmask | fmt->Bmask) { \
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switch (fmt->Rmask | fmt->Gmask | fmt->Bmask) { \
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case 0xffff: \
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if(fmt->Gmask == 0x07e0 \
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if (fmt->Gmask == 0x07e0 \
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|| fmt->Rmask == 0x07e0 \
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|| fmt->Bmask == 0x07e0) { \
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if(alpha == 128) \
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if (alpha == 128) { \
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blitter(2, Uint8, ALPHA_BLIT16_565_50); \
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else { \
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} else { \
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blitter(2, Uint8, ALPHA_BLIT16_565); \
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} \
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} else \
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@ -334,17 +334,18 @@
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break; \
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\
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case 0x7fff: \
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if(fmt->Gmask == 0x03e0 \
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if (fmt->Gmask == 0x03e0 \
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|| fmt->Rmask == 0x03e0 \
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|| fmt->Bmask == 0x03e0) { \
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if(alpha == 128) \
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if (alpha == 128) { \
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blitter(2, Uint8, ALPHA_BLIT16_555_50); \
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else { \
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} else { \
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blitter(2, Uint8, ALPHA_BLIT16_555); \
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} \
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break; \
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} \
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/* fallthrough */ \
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} else \
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goto general16; \
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break; \
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\
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default: \
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general16: \
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@ -357,13 +358,14 @@
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break; \
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\
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case 4: \
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if((fmt->Rmask | fmt->Gmask | fmt->Bmask) == 0x00ffffff \
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if ((fmt->Rmask | fmt->Gmask | fmt->Bmask) == 0x00ffffff \
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&& (fmt->Gmask == 0xff00 || fmt->Rmask == 0xff00 \
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|| fmt->Bmask == 0xff00)) { \
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if(alpha == 128) \
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if (alpha == 128) { \
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blitter(4, Uint16, ALPHA_BLIT32_888_50); \
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else \
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} else { \
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blitter(4, Uint16, ALPHA_BLIT32_888); \
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} \
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} else \
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blitter(4, Uint16, ALPHA_BLIT_ANY); \
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break; \
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@ -388,25 +390,25 @@ RLEClipBlit(int w, Uint8 * srcbuf, SDL_Surface * surf_dst,
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int left = srcrect->x; \
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int right = left + srcrect->w; \
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dstbuf -= left * bpp; \
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for(;;) { \
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for (;;) { \
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int run; \
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ofs += *(Type *)srcbuf; \
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run = ((Type *)srcbuf)[1]; \
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srcbuf += 2 * sizeof(Type); \
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if(run) { \
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if (run) { \
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/* clip to left and right borders */ \
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if(ofs < right) { \
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if (ofs < right) { \
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int start = 0; \
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int len = run; \
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int startcol; \
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if(left - ofs > 0) { \
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if (left - ofs > 0) { \
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start = left - ofs; \
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len -= start; \
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if(len <= 0) \
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if (len <= 0) \
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goto nocopy ## bpp ## do_blit; \
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} \
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startcol = ofs + start; \
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if(len > right - startcol) \
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if (len > right - startcol) \
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len = right - startcol; \
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do_blit(dstbuf + startcol * bpp, srcbuf + start * bpp, \
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len, bpp, alpha); \
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@ -414,12 +416,13 @@ RLEClipBlit(int w, Uint8 * srcbuf, SDL_Surface * surf_dst,
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nocopy ## bpp ## do_blit: \
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srcbuf += run * bpp; \
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ofs += run; \
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} else if(!ofs) \
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} else if (!ofs) \
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break; \
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if(ofs == w) { \
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\
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if (ofs == w) { \
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ofs = 0; \
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dstbuf += surf_dst->pitch; \
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if(!--linecount) \
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if (!--linecount) \
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break; \
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} \
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} \
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