mirror of https://github.com/encounter/SDL.git
Made the RLE code (semi) readable again
This commit is contained in:
Sam Lantinga
parent
b4deeeba05
commit
a8955f2640
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@ -115,22 +115,22 @@
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* This can be used for any RGB permutation of course.
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* This can be used for any RGB permutation of course.
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*/
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*/
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#define ALPHA_BLIT32_888(to, from, length, bpp, alpha) \
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#define ALPHA_BLIT32_888(to, from, length, bpp, alpha) \
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do { \
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do { \
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int i; \
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int i; \
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Uint32 *src = (Uint32 *)(from); \
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Uint32 *src = (Uint32 *)(from); \
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Uint32 *dst = (Uint32 *)(to); \
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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 s = *src++; \
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Uint32 d = *dst; \
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Uint32 d = *dst; \
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Uint32 s1 = s & 0xff00ff; \
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Uint32 s1 = s & 0xff00ff; \
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Uint32 d1 = d & 0xff00ff; \
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Uint32 d1 = d & 0xff00ff; \
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d1 = (d1 + ((s1 - d1) * alpha >> 8)) & 0xff00ff; \
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d1 = (d1 + ((s1 - d1) * alpha >> 8)) & 0xff00ff; \
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s &= 0xff00; \
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s &= 0xff00; \
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d &= 0xff00; \
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d &= 0xff00; \
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d = (d + ((s - d) * alpha >> 8)) & 0xff00; \
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d = (d + ((s - d) * alpha >> 8)) & 0xff00; \
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*dst++ = d1 | d; \
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*dst++ = d1 | d; \
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} \
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} \
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} while(0)
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} while (0)
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/*
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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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* For 16bpp pixels we can go a step further: put the middle component
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@ -139,97 +139,97 @@
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* 5 bits, we have to scale alpha down to 5 bits as well.
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* 5 bits, we have to scale alpha down to 5 bits as well.
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*/
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*/
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#define ALPHA_BLIT16_565(to, from, length, bpp, alpha) \
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#define ALPHA_BLIT16_565(to, from, length, bpp, alpha) \
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do { \
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do { \
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int i; \
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int i; \
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Uint16 *src = (Uint16 *)(from); \
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Uint16 *src = (Uint16 *)(from); \
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Uint16 *dst = (Uint16 *)(to); \
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Uint16 *dst = (Uint16 *)(to); \
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Uint32 ALPHA = alpha >> 3; \
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Uint32 ALPHA = alpha >> 3; \
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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 s = *src++; \
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Uint32 d = *dst; \
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Uint32 d = *dst; \
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s = (s | s << 16) & 0x07e0f81f; \
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s = (s | s << 16) & 0x07e0f81f; \
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d = (d | d << 16) & 0x07e0f81f; \
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d = (d | d << 16) & 0x07e0f81f; \
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d += (s - d) * ALPHA >> 5; \
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d += (s - d) * ALPHA >> 5; \
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d &= 0x07e0f81f; \
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d &= 0x07e0f81f; \
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*dst++ = (Uint16)(d | d >> 16); \
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*dst++ = (Uint16)(d | d >> 16); \
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} \
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} \
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} while(0)
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} while(0)
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#define ALPHA_BLIT16_555(to, from, length, bpp, alpha) \
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#define ALPHA_BLIT16_555(to, from, length, bpp, alpha) \
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do { \
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do { \
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int i; \
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int i; \
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Uint16 *src = (Uint16 *)(from); \
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Uint16 *src = (Uint16 *)(from); \
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Uint16 *dst = (Uint16 *)(to); \
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Uint16 *dst = (Uint16 *)(to); \
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Uint32 ALPHA = alpha >> 3; \
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Uint32 ALPHA = alpha >> 3; \
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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 s = *src++; \
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Uint32 d = *dst; \
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Uint32 d = *dst; \
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s = (s | s << 16) & 0x03e07c1f; \
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s = (s | s << 16) & 0x03e07c1f; \
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d = (d | d << 16) & 0x03e07c1f; \
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d = (d | d << 16) & 0x03e07c1f; \
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d += (s - d) * ALPHA >> 5; \
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d += (s - d) * ALPHA >> 5; \
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d &= 0x03e07c1f; \
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d &= 0x03e07c1f; \
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*dst++ = (Uint16)(d | d >> 16); \
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*dst++ = (Uint16)(d | d >> 16); \
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} \
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} \
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} while(0)
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} while(0)
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/*
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/*
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* The general slow catch-all function, for remaining depths and formats
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* The general slow catch-all function, for remaining depths and formats
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*/
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*/
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#define ALPHA_BLIT_ANY(to, from, length, bpp, alpha) \
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#define ALPHA_BLIT_ANY(to, from, length, bpp, alpha) \
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do { \
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do { \
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int i; \
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int i; \
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Uint8 *src = from; \
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Uint8 *src = from; \
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Uint8 *dst = to; \
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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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Uint32 s, d; \
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unsigned rs, gs, bs, rd, gd, bd; \
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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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case 2: \
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s = *(Uint16 *)src; \
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s = *(Uint16 *)src; \
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d = *(Uint16 *)dst; \
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d = *(Uint16 *)dst; \
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break; \
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break; \
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case 3: \
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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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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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d = (dst[0] << 16) | (dst[1] << 8) | dst[2]; \
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} else { \
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} else { \
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s = (src[2] << 16) | (src[1] << 8) | src[0]; \
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s = (src[2] << 16) | (src[1] << 8) | src[0]; \
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d = (dst[2] << 16) | (dst[1] << 8) | dst[0]; \
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d = (dst[2] << 16) | (dst[1] << 8) | dst[0]; \
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} \
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} \
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break; \
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break; \
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case 4: \
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case 4: \
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s = *(Uint32 *)src; \
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s = *(Uint32 *)src; \
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d = *(Uint32 *)dst; \
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d = *(Uint32 *)dst; \
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break; \
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break; \
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} \
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} \
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RGB_FROM_PIXEL(s, fmt, rs, gs, bs); \
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RGB_FROM_PIXEL(s, fmt, rs, gs, bs); \
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RGB_FROM_PIXEL(d, fmt, rd, gd, bd); \
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RGB_FROM_PIXEL(d, fmt, rd, gd, bd); \
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rd += (rs - rd) * alpha >> 8; \
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rd += (rs - rd) * alpha >> 8; \
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gd += (gs - gd) * alpha >> 8; \
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gd += (gs - gd) * alpha >> 8; \
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bd += (bs - bd) * 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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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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case 2: \
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*(Uint16 *)dst = (Uint16)d; \
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*(Uint16 *)dst = (Uint16)d; \
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break; \
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break; \
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case 3: \
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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[0] = (Uint8)(d >> 16); \
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dst[1] = (Uint8)(d >> 8); \
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dst[1] = (Uint8)(d >> 8); \
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dst[2] = (Uint8)(d); \
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dst[2] = (Uint8)(d); \
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} else { \
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} else { \
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dst[0] = (Uint8)d; \
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dst[0] = (Uint8)d; \
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dst[1] = (Uint8)(d >> 8); \
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dst[1] = (Uint8)(d >> 8); \
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dst[2] = (Uint8)(d >> 16); \
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dst[2] = (Uint8)(d >> 16); \
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} \
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} \
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break; \
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break; \
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case 4: \
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case 4: \
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*(Uint32 *)dst = d; \
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*(Uint32 *)dst = d; \
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break; \
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break; \
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} \
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} \
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src += bpp; \
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src += bpp; \
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dst += bpp; \
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dst += bpp; \
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} \
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} \
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} while(0)
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} while(0)
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/*
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/*
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@ -241,16 +241,16 @@
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* add them. Then shift right and add the sum of the lowest bits.
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* add them. Then shift right and add the sum of the lowest bits.
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*/
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*/
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#define ALPHA_BLIT32_888_50(to, from, length, bpp, alpha) \
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#define ALPHA_BLIT32_888_50(to, from, length, bpp, alpha) \
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do { \
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do { \
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int i; \
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int i; \
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Uint32 *src = (Uint32 *)(from); \
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Uint32 *src = (Uint32 *)(from); \
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Uint32 *dst = (Uint32 *)(to); \
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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 s = *src++; \
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Uint32 d = *dst; \
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Uint32 d = *dst; \
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*dst++ = (((s & 0x00fefefe) + (d & 0x00fefefe)) >> 1) \
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*dst++ = (((s & 0x00fefefe) + (d & 0x00fefefe)) >> 1) \
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+ (s & d & 0x00010101); \
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+ (s & d & 0x00010101); \
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} \
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} \
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} while(0)
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} while(0)
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/*
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/*
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@ -259,116 +259,118 @@
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*/
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*/
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/* helper: blend a single 16 bit pixel at 50% */
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/* helper: blend a single 16 bit pixel at 50% */
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#define BLEND16_50(dst, src, mask) \
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#define BLEND16_50(dst, src, mask) \
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do { \
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do { \
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Uint32 s = *src++; \
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Uint32 s = *src++; \
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Uint32 d = *dst; \
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Uint32 d = *dst; \
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*dst++ = (Uint16)((((s & mask) + (d & mask)) >> 1) + \
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*dst++ = (Uint16)((((s & mask) + (d & mask)) >> 1) + \
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(s & d & (~mask & 0xffff))); \
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(s & d & (~mask & 0xffff))); \
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} while(0)
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} while(0)
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/* basic 16bpp blender. mask is the pixels to keep when adding. */
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/* basic 16bpp blender. mask is the pixels to keep when adding. */
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#define ALPHA_BLIT16_50(to, from, length, bpp, alpha, mask) \
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#define ALPHA_BLIT16_50(to, from, length, bpp, alpha, mask) \
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do { \
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do { \
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unsigned n = (length); \
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unsigned n = (length); \
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Uint16 *src = (Uint16 *)(from); \
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Uint16 *src = (Uint16 *)(from); \
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Uint16 *dst = (Uint16 *)(to); \
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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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/* 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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BLEND16_50(dst, src, mask); \
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} else { \
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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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/* first odd pixel */ \
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BLEND16_50(dst, src, mask); \
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BLEND16_50(dst, src, mask); \
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n--; \
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n--; \
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} \
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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 s = *(Uint32 *)src; \
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Uint32 d = *(Uint32 *)dst; \
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Uint32 d = *(Uint32 *)dst; \
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*(Uint32 *)dst = ((s & (mask | mask << 16)) >> 1) \
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*(Uint32 *)dst = ((s & (mask | mask << 16)) >> 1) \
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+ ((d & (mask | mask << 16)) >> 1) \
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+ ((d & (mask | mask << 16)) >> 1) \
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+ (s & d & (~(mask | mask << 16))); \
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+ (s & d & (~(mask | mask << 16))); \
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src += 2; \
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src += 2; \
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dst += 2; \
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dst += 2; \
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} \
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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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BLEND16_50(dst, src, mask); /* last odd pixel */ \
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} \
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} \
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} while(0)
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} while(0)
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#define ALPHA_BLIT16_565_50(to, from, length, bpp, alpha) \
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#define ALPHA_BLIT16_565_50(to, from, length, bpp, alpha) \
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ALPHA_BLIT16_50(to, from, length, bpp, alpha, 0xf7de)
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ALPHA_BLIT16_50(to, from, length, bpp, alpha, 0xf7de)
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#define ALPHA_BLIT16_555_50(to, from, length, bpp, alpha) \
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#define ALPHA_BLIT16_555_50(to, from, length, bpp, alpha) \
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ALPHA_BLIT16_50(to, from, length, bpp, alpha, 0xfbde)
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ALPHA_BLIT16_50(to, from, length, bpp, alpha, 0xfbde)
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#define CHOOSE_BLIT(blitter, alpha, fmt) \
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#define CHOOSE_BLIT(blitter, alpha, fmt) \
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do { \
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do { \
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if(alpha == 255) { \
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if (alpha == 255) { \
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switch(fmt->BytesPerPixel) { \
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switch (fmt->BytesPerPixel) { \
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case 1: blitter(1, Uint8, OPAQUE_BLIT); break; \
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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 2: blitter(2, Uint8, OPAQUE_BLIT); break; \
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case 3: blitter(3, 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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case 4: blitter(4, Uint16, OPAQUE_BLIT); break; \
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} \
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} \
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} else { \
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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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case 1: \
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/* No 8bpp alpha blitting */ \
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/* No 8bpp alpha blitting */ \
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break; \
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break; \
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\
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\
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case 2: \
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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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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->Rmask == 0x07e0 \
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|| fmt->Bmask == 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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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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blitter(2, Uint8, ALPHA_BLIT16_565); \
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} \
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} \
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} else \
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} else \
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goto general16; \
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goto general16; \
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break; \
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break; \
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\
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\
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case 0x7fff: \
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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->Rmask == 0x03e0 \
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|| fmt->Bmask == 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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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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blitter(2, Uint8, ALPHA_BLIT16_555); \
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} \
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} \
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break; \
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break; \
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} \
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} else \
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/* fallthrough */ \
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goto general16; \
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\
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break; \
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default: \
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\
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general16: \
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default: \
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blitter(2, Uint8, ALPHA_BLIT_ANY); \
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general16: \
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} \
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blitter(2, Uint8, ALPHA_BLIT_ANY); \
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break; \
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} \
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\
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break; \
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case 3: \
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\
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blitter(3, Uint8, ALPHA_BLIT_ANY); \
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case 3: \
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break; \
|
blitter(3, Uint8, ALPHA_BLIT_ANY); \
|
||||||
\
|
break; \
|
||||||
case 4: \
|
\
|
||||||
if((fmt->Rmask | fmt->Gmask | fmt->Bmask) == 0x00ffffff \
|
case 4: \
|
||||||
&& (fmt->Gmask == 0xff00 || fmt->Rmask == 0xff00 \
|
if ((fmt->Rmask | fmt->Gmask | fmt->Bmask) == 0x00ffffff \
|
||||||
|| fmt->Bmask == 0xff00)) { \
|
&& (fmt->Gmask == 0xff00 || fmt->Rmask == 0xff00 \
|
||||||
if(alpha == 128) \
|
|| fmt->Bmask == 0xff00)) { \
|
||||||
blitter(4, Uint16, ALPHA_BLIT32_888_50); \
|
if (alpha == 128) { \
|
||||||
else \
|
blitter(4, Uint16, ALPHA_BLIT32_888_50); \
|
||||||
blitter(4, Uint16, ALPHA_BLIT32_888); \
|
} else { \
|
||||||
} else \
|
blitter(4, Uint16, ALPHA_BLIT32_888); \
|
||||||
blitter(4, Uint16, ALPHA_BLIT_ANY); \
|
} \
|
||||||
break; \
|
} else \
|
||||||
} \
|
blitter(4, Uint16, ALPHA_BLIT_ANY); \
|
||||||
} \
|
break; \
|
||||||
|
} \
|
||||||
|
} \
|
||||||
} while(0)
|
} while(0)
|
||||||
|
|
||||||
/*
|
/*
|
||||||
|
|
@ -381,48 +383,49 @@ RLEClipBlit(int w, Uint8 * srcbuf, SDL_Surface * surf_dst,
|
||||||
{
|
{
|
||||||
SDL_PixelFormat *fmt = surf_dst->format;
|
SDL_PixelFormat *fmt = surf_dst->format;
|
||||||
|
|
||||||
#define RLECLIPBLIT(bpp, Type, do_blit) \
|
#define RLECLIPBLIT(bpp, Type, do_blit) \
|
||||||
do { \
|
do { \
|
||||||
int linecount = srcrect->h; \
|
int linecount = srcrect->h; \
|
||||||
int ofs = 0; \
|
int ofs = 0; \
|
||||||
int left = srcrect->x; \
|
int left = srcrect->x; \
|
||||||
int right = left + srcrect->w; \
|
int right = left + srcrect->w; \
|
||||||
dstbuf -= left * bpp; \
|
dstbuf -= left * bpp; \
|
||||||
for(;;) { \
|
for (;;) { \
|
||||||
int run; \
|
int run; \
|
||||||
ofs += *(Type *)srcbuf; \
|
ofs += *(Type *)srcbuf; \
|
||||||
run = ((Type *)srcbuf)[1]; \
|
run = ((Type *)srcbuf)[1]; \
|
||||||
srcbuf += 2 * sizeof(Type); \
|
srcbuf += 2 * sizeof(Type); \
|
||||||
if(run) { \
|
if (run) { \
|
||||||
/* clip to left and right borders */ \
|
/* clip to left and right borders */ \
|
||||||
if(ofs < right) { \
|
if (ofs < right) { \
|
||||||
int start = 0; \
|
int start = 0; \
|
||||||
int len = run; \
|
int len = run; \
|
||||||
int startcol; \
|
int startcol; \
|
||||||
if(left - ofs > 0) { \
|
if (left - ofs > 0) { \
|
||||||
start = left - ofs; \
|
start = left - ofs; \
|
||||||
len -= start; \
|
len -= start; \
|
||||||
if(len <= 0) \
|
if (len <= 0) \
|
||||||
goto nocopy ## bpp ## do_blit; \
|
goto nocopy ## bpp ## do_blit; \
|
||||||
} \
|
} \
|
||||||
startcol = ofs + start; \
|
startcol = ofs + start; \
|
||||||
if(len > right - startcol) \
|
if (len > right - startcol) \
|
||||||
len = right - startcol; \
|
len = right - startcol; \
|
||||||
do_blit(dstbuf + startcol * bpp, srcbuf + start * bpp, \
|
do_blit(dstbuf + startcol * bpp, srcbuf + start * bpp, \
|
||||||
len, bpp, alpha); \
|
len, bpp, alpha); \
|
||||||
} \
|
} \
|
||||||
nocopy ## bpp ## do_blit: \
|
nocopy ## bpp ## do_blit: \
|
||||||
srcbuf += run * bpp; \
|
srcbuf += run * bpp; \
|
||||||
ofs += run; \
|
ofs += run; \
|
||||||
} else if(!ofs) \
|
} else if (!ofs) \
|
||||||
break; \
|
break; \
|
||||||
if(ofs == w) { \
|
\
|
||||||
ofs = 0; \
|
if (ofs == w) { \
|
||||||
dstbuf += surf_dst->pitch; \
|
ofs = 0; \
|
||||||
if(!--linecount) \
|
dstbuf += surf_dst->pitch; \
|
||||||
break; \
|
if (!--linecount) \
|
||||||
} \
|
break; \
|
||||||
} \
|
} \
|
||||||
|
} \
|
||||||
} while(0)
|
} while(0)
|
||||||
|
|
||||||
CHOOSE_BLIT(RLECLIPBLIT, alpha, fmt);
|
CHOOSE_BLIT(RLECLIPBLIT, alpha, fmt);
|
||||||
|
|
|
||||||
Loading…
Reference in New Issue