| /* |
| Simple DirectMedia Layer |
| Copyright (C) 1997-2026 Sam Lantinga <slouken@libsdl.org> |
| |
| This software is provided 'as-is', without any express or implied |
| warranty. In no event will the authors be held liable for any damages |
| arising from the use of this software. |
| |
| Permission is granted to anyone to use this software for any purpose, |
| including commercial applications, and to alter it and redistribute it |
| freely, subject to the following restrictions: |
| |
| 1. The origin of this software must not be misrepresented; you must not |
| claim that you wrote the original software. If you use this software |
| in a product, an acknowledgment in the product documentation would be |
| appreciated but is not required. |
| 2. Altered source versions must be plainly marked as such, and must not be |
| misrepresented as being the original software. |
| 3. This notice may not be removed or altered from any source distribution. |
| */ |
| #include "SDL_internal.h" |
| |
| #ifndef SDL_blit_h_ |
| #define SDL_blit_h_ |
| |
| // Table to do pixel byte expansion |
| extern const Uint8 *SDL_expand_byte[9]; |
| extern const Uint16 SDL_expand_byte_10[]; |
| |
| // SDL blit copy flags |
| #define SDL_COPY_MODULATE_COLOR 0x00000001 |
| #define SDL_COPY_MODULATE_ALPHA 0x00000002 |
| #define SDL_COPY_MODULATE_MASK (SDL_COPY_MODULATE_COLOR | SDL_COPY_MODULATE_ALPHA) |
| #define SDL_COPY_BLEND 0x00000010 |
| #define SDL_COPY_BLEND_PREMULTIPLIED 0x00000020 |
| #define SDL_COPY_ADD 0x00000040 |
| #define SDL_COPY_ADD_PREMULTIPLIED 0x00000080 |
| #define SDL_COPY_MOD 0x00000100 |
| #define SDL_COPY_MUL 0x00000200 |
| #define SDL_COPY_BLEND_MASK (SDL_COPY_BLEND | SDL_COPY_BLEND_PREMULTIPLIED | SDL_COPY_ADD | SDL_COPY_ADD_PREMULTIPLIED | SDL_COPY_MOD | SDL_COPY_MUL) |
| #define SDL_COPY_COLORKEY 0x00000400 |
| #define SDL_COPY_NEAREST 0x00000800 |
| #define SDL_COPY_RLE_DESIRED 0x00001000 |
| #define SDL_COPY_RLE_COLORKEY 0x00002000 |
| #define SDL_COPY_RLE_ALPHAKEY 0x00004000 |
| #define SDL_COPY_RLE_MASK (SDL_COPY_RLE_DESIRED | SDL_COPY_RLE_COLORKEY | SDL_COPY_RLE_ALPHAKEY) |
| |
| // SDL blit CPU flags |
| #define SDL_CPU_ANY 0x00000000 |
| #define SDL_CPU_MMX 0x00000001 |
| #define SDL_CPU_SSE 0x00000002 |
| #define SDL_CPU_SSE2 0x00000004 |
| #define SDL_CPU_ALTIVEC_PREFETCH 0x00000008 |
| #define SDL_CPU_ALTIVEC_NOPREFETCH 0x00000010 |
| |
| typedef struct |
| { |
| SDL_Surface *src_surface; |
| Uint8 *src; |
| int src_w, src_h; |
| int src_pitch; |
| int src_skip; |
| int leading_skip; |
| SDL_Surface *dst_surface; |
| Uint8 *dst; |
| int dst_w, dst_h; |
| int dst_pitch; |
| int dst_skip; |
| const SDL_PixelFormatDetails *src_fmt; |
| const SDL_Palette *src_pal; |
| const SDL_PixelFormatDetails *dst_fmt; |
| const SDL_Palette *dst_pal; |
| Uint8 *table; |
| SDL_HashTable *palette_map; |
| int flags; |
| Uint32 colorkey; |
| Uint8 r, g, b, a; |
| } SDL_BlitInfo; |
| |
| typedef void (*SDL_BlitFunc)(SDL_BlitInfo *info); |
| |
| typedef struct |
| { |
| SDL_PixelFormat src_format; |
| SDL_PixelFormat dst_format; |
| int flags; |
| unsigned int cpu; |
| SDL_BlitFunc func; |
| } SDL_BlitFuncEntry; |
| |
| typedef bool (SDLCALL *SDL_Blit) (struct SDL_Surface *src, const SDL_Rect *srcrect, struct SDL_Surface *dst, const SDL_Rect *dstrect); |
| |
| // Blit mapping definition |
| typedef struct SDL_BlitMap |
| { |
| int identity; |
| SDL_Blit blit; |
| void *data; |
| SDL_BlitInfo info; |
| |
| /* the version count matches the destination; mismatch indicates |
| an invalid mapping */ |
| Uint32 dst_palette_version; |
| Uint32 src_palette_version; |
| } SDL_BlitMap; |
| |
| // Functions found in SDL_blit.c |
| extern bool SDL_CalculateBlit(SDL_Surface *surface, SDL_Surface *dst); |
| |
| /* Functions found in SDL_blit_*.c */ |
| extern SDL_BlitFunc SDL_CalculateBlit0(SDL_Surface *surface); |
| extern SDL_BlitFunc SDL_CalculateBlit1(SDL_Surface *surface); |
| extern SDL_BlitFunc SDL_CalculateBlitN(SDL_Surface *surface); |
| extern SDL_BlitFunc SDL_CalculateBlitA(SDL_Surface *surface); |
| |
| /* |
| * Useful macros for blitting routines |
| */ |
| |
| #ifdef __GNUC__ |
| #define DECLARE_ALIGNED(t, v, a) t __attribute__((aligned(a))) v |
| #elif defined(_MSC_VER) |
| #define DECLARE_ALIGNED(t, v, a) __declspec(align(a)) t v |
| #else |
| #define DECLARE_ALIGNED(t, v, a) t v |
| #endif |
| |
| // Load pixel of the specified format from a buffer and get its R-G-B values |
| #define RGB_FROM_PIXEL(Pixel, fmt, r, g, b) \ |
| { \ |
| r = SDL_expand_byte[fmt->Rbits][((Pixel & fmt->Rmask) >> fmt->Rshift)]; \ |
| g = SDL_expand_byte[fmt->Gbits][((Pixel & fmt->Gmask) >> fmt->Gshift)]; \ |
| b = SDL_expand_byte[fmt->Bbits][((Pixel & fmt->Bmask) >> fmt->Bshift)]; \ |
| } |
| #define RGB_FROM_RGB565(Pixel, r, g, b) \ |
| { \ |
| r = SDL_expand_byte[5][((Pixel & 0xF800) >> 11)]; \ |
| g = SDL_expand_byte[6][((Pixel & 0x07E0) >> 5)]; \ |
| b = SDL_expand_byte[5][(Pixel & 0x001F)]; \ |
| } |
| #define RGB_FROM_RGB555(Pixel, r, g, b) \ |
| { \ |
| r = SDL_expand_byte[5][((Pixel & 0x7C00) >> 10)]; \ |
| g = SDL_expand_byte[5][((Pixel & 0x03E0) >> 5)]; \ |
| b = SDL_expand_byte[5][(Pixel & 0x001F)]; \ |
| } |
| #define RGB_FROM_XRGB8888(Pixel, r, g, b) \ |
| { \ |
| r = ((Pixel & 0xFF0000) >> 16); \ |
| g = ((Pixel & 0xFF00) >> 8); \ |
| b = (Pixel & 0xFF); \ |
| } |
| #if SDL_BYTEORDER == SDL_LIL_ENDIAN |
| #define GET_RGB24(B) (B[2] << 16) | (B[1] << 8) | B[0] |
| #else |
| #define GET_RGB24(B) (B[0] << 16) | (B[1] << 8) | B[2] |
| #endif |
| #define RETRIEVE_RGB_PIXEL(buf, bpp, Pixel) \ |
| do { \ |
| switch (bpp) { \ |
| case 1: \ |
| Pixel = *((Uint8 *)(buf)); \ |
| break; \ |
| \ |
| case 2: \ |
| Pixel = *((Uint16 *)(buf)); \ |
| break; \ |
| \ |
| case 3: \ |
| { \ |
| Uint8 *B = (Uint8 *)(buf); \ |
| Pixel = GET_RGB24(B); \ |
| } break; \ |
| \ |
| case 4: \ |
| Pixel = *((Uint32 *)(buf)); \ |
| break; \ |
| \ |
| default: \ |
| Pixel = 0; /* stop gcc complaints */ \ |
| break; \ |
| } \ |
| } while (0) |
| |
| #if SDL_BYTEORDER == SDL_LIL_ENDIAN |
| #define GET_RGB24_COMPONENT(buf, fmt, shift) *((buf) + fmt->shift / 8) |
| #else |
| #define GET_RGB24_COMPONENT(buf, fmt, shift) *((buf) + 2 - fmt->shift / 8) |
| #endif |
| #define DISEMBLE_RGB(buf, bpp, fmt, Pixel, r, g, b) \ |
| do { \ |
| switch (bpp) { \ |
| case 1: \ |
| Pixel = *((Uint8 *)(buf)); \ |
| RGB_FROM_PIXEL(Pixel, fmt, r, g, b); \ |
| break; \ |
| \ |
| case 2: \ |
| Pixel = *((Uint16 *)(buf)); \ |
| RGB_FROM_PIXEL(Pixel, fmt, r, g, b); \ |
| break; \ |
| \ |
| case 3: \ |
| { \ |
| Pixel = 0; \ |
| r = GET_RGB24_COMPONENT(buf, fmt, Rshift); \ |
| g = GET_RGB24_COMPONENT(buf, fmt, Gshift); \ |
| b = GET_RGB24_COMPONENT(buf, fmt, Bshift); \ |
| } break; \ |
| \ |
| case 4: \ |
| Pixel = *((Uint32 *)(buf)); \ |
| RGB_FROM_PIXEL(Pixel, fmt, r, g, b); \ |
| break; \ |
| \ |
| default: \ |
| /* stop gcc complaints */ \ |
| Pixel = 0; \ |
| r = g = b = 0; \ |
| break; \ |
| } \ |
| } while (0) |
| |
| // Assemble R-G-B values into a specified pixel format and store them |
| #define PIXEL_FROM_RGB(Pixel, fmt, r, g, b) \ |
| { \ |
| Pixel = ((r >> (8 - fmt->Rbits)) << fmt->Rshift) | \ |
| ((g >> (8 - fmt->Gbits)) << fmt->Gshift) | \ |
| ((b >> (8 - fmt->Bbits)) << fmt->Bshift) | \ |
| fmt->Amask; \ |
| } |
| #define RGB332_FROM_RGB(Pixel, r, g, b) \ |
| { \ |
| Pixel = (Uint8)(((r >> 5) << 5) | ((g >> 5) << 2) | (b >> 6)); \ |
| } |
| #define RGB565_FROM_RGB(Pixel, r, g, b) \ |
| { \ |
| Pixel = (Uint16)(((r >> 3) << 11) | ((g >> 2) << 5) | (b >> 3)); \ |
| } |
| #define RGB555_FROM_RGB(Pixel, r, g, b) \ |
| { \ |
| Pixel = (Uint16)(((r >> 3) << 10) | ((g >> 3) << 5) | (b >> 3)); \ |
| } |
| #define XRGB8888_FROM_RGB(Pixel, r, g, b) \ |
| { \ |
| Pixel = (r << 16) | (g << 8) | b; \ |
| } |
| #define ARGB8888_FROM_RGBA(Pixel, r, g, b, a) \ |
| { \ |
| Pixel = (a << 24) | (r << 16) | (g << 8) | b; \ |
| } |
| #define RGBA8888_FROM_RGBA(Pixel, r, g, b, a) \ |
| { \ |
| Pixel = (r << 24) | (g << 16) | (b << 8) | a; \ |
| } |
| #define ABGR8888_FROM_RGBA(Pixel, r, g, b, a) \ |
| { \ |
| Pixel = (a << 24) | (b << 16) | (g << 8) | r; \ |
| } |
| #define BGRA8888_FROM_RGBA(Pixel, r, g, b, a) \ |
| { \ |
| Pixel = (b << 24) | (g << 16) | (r << 8) | a; \ |
| } |
| #define ARGB2101010_FROM_RGBA(Pixel, r, g, b, a) \ |
| { \ |
| r = r ? ((r << 2) | 0x3) : 0; \ |
| g = g ? ((g << 2) | 0x3) : 0; \ |
| b = b ? ((b << 2) | 0x3) : 0; \ |
| a = (a * 3) / 255; \ |
| Pixel = (a << 30) | (r << 20) | (g << 10) | b; \ |
| } |
| #define ARGB2101010_FROM_RGBAFLOAT(Pixel, r, g, b, a) \ |
| { \ |
| r = SDL_clamp(r, 0.0f, 1.0f) * 1023.0f; \ |
| g = SDL_clamp(g, 0.0f, 1.0f) * 1023.0f; \ |
| b = SDL_clamp(b, 0.0f, 1.0f) * 1023.0f; \ |
| a = SDL_clamp(a, 0.0f, 1.0f) * 3.0f; \ |
| Pixel = (((Uint32)SDL_roundf(a)) << 30) | \ |
| (((Uint32)SDL_roundf(r)) << 20) | \ |
| (((Uint32)SDL_roundf(g)) << 10) | \ |
| (Uint32)SDL_roundf(b); \ |
| } |
| #define ABGR2101010_FROM_RGBA(Pixel, r, g, b, a) \ |
| { \ |
| r = r ? ((r << 2) | 0x3) : 0; \ |
| g = g ? ((g << 2) | 0x3) : 0; \ |
| b = b ? ((b << 2) | 0x3) : 0; \ |
| a = (a * 3) / 255; \ |
| Pixel = (a << 30) | (b << 20) | (g << 10) | r; \ |
| } |
| #define ABGR2101010_FROM_RGBAFLOAT(Pixel, r, g, b, a) \ |
| { \ |
| r = SDL_clamp(r, 0.0f, 1.0f) * 1023.0f; \ |
| g = SDL_clamp(g, 0.0f, 1.0f) * 1023.0f; \ |
| b = SDL_clamp(b, 0.0f, 1.0f) * 1023.0f; \ |
| a = SDL_clamp(a, 0.0f, 1.0f) * 3.0f; \ |
| Pixel = (((Uint32)SDL_roundf(a)) << 30) | \ |
| (((Uint32)SDL_roundf(b)) << 20) | \ |
| (((Uint32)SDL_roundf(g)) << 10) | \ |
| (Uint32)SDL_roundf(r); \ |
| } |
| #define ASSEMBLE_RGB(buf, bpp, fmt, r, g, b) \ |
| { \ |
| switch (bpp) { \ |
| case 1: \ |
| { \ |
| Uint8 _pixel; \ |
| \ |
| PIXEL_FROM_RGB(_pixel, fmt, r, g, b); \ |
| *((Uint8 *)(buf)) = _pixel; \ |
| } break; \ |
| \ |
| case 2: \ |
| { \ |
| Uint16 _pixel; \ |
| \ |
| PIXEL_FROM_RGB(_pixel, fmt, r, g, b); \ |
| *((Uint16 *)(buf)) = _pixel; \ |
| } break; \ |
| \ |
| case 3: \ |
| { \ |
| GET_RGB24_COMPONENT(buf, fmt, Rshift) = r; \ |
| GET_RGB24_COMPONENT(buf, fmt, Gshift) = g; \ |
| GET_RGB24_COMPONENT(buf, fmt, Bshift) = b; \ |
| } break; \ |
| \ |
| case 4: \ |
| { \ |
| Uint32 _pixel; \ |
| \ |
| PIXEL_FROM_RGB(_pixel, fmt, r, g, b); \ |
| *((Uint32 *)(buf)) = _pixel; \ |
| } break; \ |
| } \ |
| } |
| |
| // FIXME: Should we rescale alpha into 0..255 here? |
| #define RGBA_FROM_PIXEL(Pixel, fmt, r, g, b, a) \ |
| { \ |
| r = SDL_expand_byte[fmt->Rbits][((Pixel & fmt->Rmask) >> fmt->Rshift)]; \ |
| g = SDL_expand_byte[fmt->Gbits][((Pixel & fmt->Gmask) >> fmt->Gshift)]; \ |
| b = SDL_expand_byte[fmt->Bbits][((Pixel & fmt->Bmask) >> fmt->Bshift)]; \ |
| a = SDL_expand_byte[fmt->Abits][((Pixel & fmt->Amask) >> fmt->Ashift)]; \ |
| } |
| #define RGBA_FROM_8888(Pixel, fmt, r, g, b, a) \ |
| { \ |
| r = (Pixel & fmt->Rmask) >> fmt->Rshift; \ |
| g = (Pixel & fmt->Gmask) >> fmt->Gshift; \ |
| b = (Pixel & fmt->Bmask) >> fmt->Bshift; \ |
| a = (Pixel & fmt->Amask) >> fmt->Ashift; \ |
| } |
| #define RGBA_FROM_RGBA8888(Pixel, r, g, b, a) \ |
| { \ |
| r = (Pixel >> 24); \ |
| g = ((Pixel >> 16) & 0xFF); \ |
| b = ((Pixel >> 8) & 0xFF); \ |
| a = (Pixel & 0xFF); \ |
| } |
| #define RGBA_FROM_ARGB8888(Pixel, r, g, b, a) \ |
| { \ |
| r = ((Pixel >> 16) & 0xFF); \ |
| g = ((Pixel >> 8) & 0xFF); \ |
| b = (Pixel & 0xFF); \ |
| a = (Pixel >> 24); \ |
| } |
| #define RGBA_FROM_ABGR8888(Pixel, r, g, b, a) \ |
| { \ |
| r = (Pixel & 0xFF); \ |
| g = ((Pixel >> 8) & 0xFF); \ |
| b = ((Pixel >> 16) & 0xFF); \ |
| a = (Pixel >> 24); \ |
| } |
| #define RGBA_FROM_BGRA8888(Pixel, r, g, b, a) \ |
| { \ |
| r = ((Pixel >> 8) & 0xFF); \ |
| g = ((Pixel >> 16) & 0xFF); \ |
| b = (Pixel >> 24); \ |
| a = (Pixel & 0xFF); \ |
| } |
| #define RGBA_FROM_ARGB2101010(Pixel, r, g, b, a) \ |
| { \ |
| r = ((Pixel >> 22) & 0xFF); \ |
| g = ((Pixel >> 12) & 0xFF); \ |
| b = ((Pixel >> 2) & 0xFF); \ |
| a = SDL_expand_byte[2][(Pixel >> 30)]; \ |
| } |
| #define RGBAFLOAT_FROM_ARGB2101010(Pixel, r, g, b, a) \ |
| { \ |
| r = (float)((Pixel >> 20) & 0x3FF) / 1023.0f; \ |
| g = (float)((Pixel >> 10) & 0x3FF) / 1023.0f; \ |
| b = (float)((Pixel >> 0) & 0x3FF) / 1023.0f; \ |
| a = (float)(Pixel >> 30) / 3.0f; \ |
| } |
| #define RGBA_FROM_ABGR2101010(Pixel, r, g, b, a) \ |
| { \ |
| r = ((Pixel >> 2) & 0xFF); \ |
| g = ((Pixel >> 12) & 0xFF); \ |
| b = ((Pixel >> 22) & 0xFF); \ |
| a = SDL_expand_byte[2][(Pixel >> 30)]; \ |
| } |
| #define RGBAFLOAT_FROM_ABGR2101010(Pixel, r, g, b, a) \ |
| { \ |
| r = (float)((Pixel >> 0) & 0x3FF) / 1023.0f; \ |
| g = (float)((Pixel >> 10) & 0x3FF) / 1023.0f; \ |
| b = (float)((Pixel >> 20) & 0x3FF) / 1023.0f; \ |
| a = (float)(Pixel >> 30) / 3.0f; \ |
| } |
| #define DISEMBLE_RGBA(buf, bpp, fmt, Pixel, r, g, b, a) \ |
| do { \ |
| switch (bpp) { \ |
| case 1: \ |
| Pixel = *((Uint8 *)(buf)); \ |
| RGBA_FROM_PIXEL(Pixel, fmt, r, g, b, a); \ |
| break; \ |
| \ |
| case 2: \ |
| Pixel = *((Uint16 *)(buf)); \ |
| RGBA_FROM_PIXEL(Pixel, fmt, r, g, b, a); \ |
| break; \ |
| \ |
| case 3: \ |
| { \ |
| Pixel = 0; \ |
| r = GET_RGB24_COMPONENT(buf, fmt, Rshift); \ |
| g = GET_RGB24_COMPONENT(buf, fmt, Gshift); \ |
| b = GET_RGB24_COMPONENT(buf, fmt, Bshift); \ |
| a = 0xFF; \ |
| } break; \ |
| \ |
| case 4: \ |
| Pixel = *((Uint32 *)(buf)); \ |
| RGBA_FROM_PIXEL(Pixel, fmt, r, g, b, a); \ |
| break; \ |
| \ |
| default: \ |
| /* stop gcc complaints */ \ |
| Pixel = 0; \ |
| r = g = b = a = 0; \ |
| break; \ |
| } \ |
| } while (0) |
| |
| // FIXME: this isn't correct, especially for Alpha (maximum != 255) |
| #define PIXEL_FROM_RGBA(Pixel, fmt, r, g, b, a) \ |
| { \ |
| Pixel = ((r >> (8 - fmt->Rbits)) << fmt->Rshift) | \ |
| ((g >> (8 - fmt->Gbits)) << fmt->Gshift) | \ |
| ((b >> (8 - fmt->Bbits)) << fmt->Bshift) | \ |
| ((a >> (8 - fmt->Abits)) << fmt->Ashift); \ |
| } |
| #define ASSEMBLE_RGBA(buf, bpp, fmt, r, g, b, a) \ |
| { \ |
| switch (bpp) { \ |
| case 1: \ |
| { \ |
| Uint8 _pixel; \ |
| \ |
| PIXEL_FROM_RGBA(_pixel, fmt, r, g, b, a); \ |
| *((Uint8 *)(buf)) = _pixel; \ |
| } break; \ |
| \ |
| case 2: \ |
| { \ |
| Uint16 _pixel; \ |
| \ |
| PIXEL_FROM_RGBA(_pixel, fmt, r, g, b, a); \ |
| *((Uint16 *)(buf)) = _pixel; \ |
| } break; \ |
| \ |
| case 3: \ |
| { \ |
| GET_RGB24_COMPONENT(buf, fmt, Rshift) = r; \ |
| GET_RGB24_COMPONENT(buf, fmt, Gshift) = g; \ |
| GET_RGB24_COMPONENT(buf, fmt, Bshift) = b; \ |
| } break; \ |
| \ |
| case 4: \ |
| { \ |
| Uint32 _pixel; \ |
| \ |
| PIXEL_FROM_RGBA(_pixel, fmt, r, g, b, a); \ |
| *((Uint32 *)(buf)) = _pixel; \ |
| } break; \ |
| } \ |
| } |
| |
| // Convert any 32-bit 4-bpp pixel to ARGB format |
| #define PIXEL_TO_ARGB_PIXEL(src, srcfmt, dst) \ |
| do { \ |
| Uint8 a, r, g, b; \ |
| RGBA_FROM_PIXEL(src, srcfmt, r, g, b, a); \ |
| dst = a << 24 | r << 16 | g << 8 | b; \ |
| } while (0) |
| // Blend a single color channel or alpha value |
| /* dC = ((sC * sA) + (dC * (255 - sA))) / 255 */ |
| #define ALPHA_BLEND_CHANNEL(sC, dC, sA) \ |
| do { \ |
| Uint16 x; \ |
| x = ((sC - dC) * sA) + ((dC << 8) - dC); \ |
| x += 0x1U; \ |
| x += x >> 8; \ |
| dC = x >> 8; \ |
| } while (0) |
| // Perform a division by 255 after a multiplication of two 8-bit color channels |
| /* out = (sC * dC) / 255 */ |
| #define MULT_DIV_255(sC, dC, out) \ |
| do { \ |
| Uint16 x = sC * dC; \ |
| x += 0x1U; \ |
| x += x >> 8; \ |
| out = x >> 8; \ |
| } while (0) |
| // Blend the RGB values of two pixels with an alpha value |
| #define ALPHA_BLEND_RGB(sR, sG, sB, A, dR, dG, dB) \ |
| do { \ |
| ALPHA_BLEND_CHANNEL(sR, dR, A); \ |
| ALPHA_BLEND_CHANNEL(sG, dG, A); \ |
| ALPHA_BLEND_CHANNEL(sB, dB, A); \ |
| } while (0) |
| |
| // Blend two 8888 pixels with the same format |
| /* Calculates dst = ((src * factor) + (dst * (255 - factor))) / 255 */ |
| // FIXME: SDL_SIZE_MAX might not be an integer literal |
| #if defined(SIZE_MAX) && (SIZE_MAX == 0xffffffffffffffff) |
| #define FACTOR_BLEND_8888(src, dst, factor) \ |
| do { \ |
| Uint64 src64 = src; \ |
| src64 = (src64 | (src64 << 24)) & 0x00FF00FF00FF00FF; \ |
| \ |
| Uint64 dst64 = dst; \ |
| dst64 = (dst64 | (dst64 << 24)) & 0x00FF00FF00FF00FF; \ |
| \ |
| dst64 = ((src64 - dst64) * factor) + (dst64 << 8) - dst64; \ |
| dst64 += 0x0001000100010001; \ |
| dst64 += (dst64 >> 8) & 0x00FF00FF00FF00FF; \ |
| dst64 &= 0xFF00FF00FF00FF00; \ |
| \ |
| dst = (Uint32)((dst64 >> 8) | (dst64 >> 32)); \ |
| } while (0) |
| #else |
| #define FACTOR_BLEND_8888(src, dst, factor) \ |
| do { \ |
| Uint32 src02 = src & 0x00FF00FF; \ |
| Uint32 dst02 = dst & 0x00FF00FF; \ |
| \ |
| Uint32 src13 = (src >> 8) & 0x00FF00FF; \ |
| Uint32 dst13 = (dst >> 8) & 0x00FF00FF; \ |
| \ |
| Uint32 res02 = ((src02 - dst02) * factor) + (dst02 << 8) - dst02; \ |
| res02 += 0x00010001; \ |
| res02 += (res02 >> 8) & 0x00FF00FF; \ |
| res02 = (res02 >> 8) & 0x00FF00FF; \ |
| \ |
| Uint32 res13 = ((src13 - dst13) * factor) + (dst13 << 8) - dst13; \ |
| res13 += 0x00010001; \ |
| res13 += (res13 >> 8) & 0x00FF00FF; \ |
| res13 &= 0xFF00FF00; \ |
| dst = res02 | res13; \ |
| } while (0) |
| #endif |
| |
| // Alpha blend two 8888 pixels with the same formats. |
| #define ALPHA_BLEND_8888(src, dst, fmt) \ |
| do { \ |
| Uint32 srcA = (src >> fmt->Ashift) & 0xFF; \ |
| Uint32 tmp = src | fmt->Amask; \ |
| FACTOR_BLEND_8888(tmp, dst, srcA); \ |
| } while (0) |
| |
| // Alpha blend two 8888 pixels with differing formats. |
| #define ALPHA_BLEND_SWIZZLE_8888(src, dst, srcfmt, dstfmt) \ |
| do { \ |
| Uint32 srcA = (src >> srcfmt->Ashift) & 0xFF; \ |
| Uint32 tmp = (((src >> srcfmt->Rshift) & 0xFF) << dstfmt->Rshift) | \ |
| (((src >> srcfmt->Gshift) & 0xFF) << dstfmt->Gshift) | \ |
| (((src >> srcfmt->Bshift) & 0xFF) << dstfmt->Bshift) | \ |
| dstfmt->Amask; \ |
| FACTOR_BLEND_8888(tmp, dst, srcA); \ |
| } while (0) |
| // Blend the RGBA values of two pixels |
| #define ALPHA_BLEND_RGBA(sR, sG, sB, sA, dR, dG, dB, dA) \ |
| do { \ |
| ALPHA_BLEND_CHANNEL(sR, dR, sA); \ |
| ALPHA_BLEND_CHANNEL(sG, dG, sA); \ |
| ALPHA_BLEND_CHANNEL(sB, dB, sA); \ |
| ALPHA_BLEND_CHANNEL(255, dA, sA); \ |
| } while (0) |
| |
| // This is a very useful loop for optimizing blitters |
| #if defined(_MSC_VER) && (_MSC_VER == 1300) |
| // There's a bug in the Visual C++ 7 optimizer when compiling this code |
| #else |
| #define USE_DUFFS_LOOP |
| #endif |
| |
| #define DUFFS_LOOP1(pixel_copy_increment, width) \ |
| { \ |
| int n; \ |
| for (n = width; n > 0; --n) { \ |
| pixel_copy_increment; \ |
| } \ |
| } |
| |
| #ifdef USE_DUFFS_LOOP |
| |
| // 8-times unrolled loop |
| #define DUFFS_LOOP8(pixel_copy_increment, width) \ |
| { \ |
| int n = (width + 7) / 8; \ |
| switch (width & 7) { \ |
| case 0: \ |
| do { \ |
| pixel_copy_increment; \ |
| SDL_FALLTHROUGH; \ |
| case 7: \ |
| pixel_copy_increment; \ |
| SDL_FALLTHROUGH; \ |
| case 6: \ |
| pixel_copy_increment; \ |
| SDL_FALLTHROUGH; \ |
| case 5: \ |
| pixel_copy_increment; \ |
| SDL_FALLTHROUGH; \ |
| case 4: \ |
| pixel_copy_increment; \ |
| SDL_FALLTHROUGH; \ |
| case 3: \ |
| pixel_copy_increment; \ |
| SDL_FALLTHROUGH; \ |
| case 2: \ |
| pixel_copy_increment; \ |
| SDL_FALLTHROUGH; \ |
| case 1: \ |
| pixel_copy_increment; \ |
| } while (--n > 0); \ |
| } \ |
| } |
| |
| // 4-times unrolled loop |
| #define DUFFS_LOOP4(pixel_copy_increment, width) \ |
| { \ |
| int n = (width + 3) / 4; \ |
| switch (width & 3) { \ |
| case 0: \ |
| do { \ |
| pixel_copy_increment; \ |
| SDL_FALLTHROUGH; \ |
| case 3: \ |
| pixel_copy_increment; \ |
| SDL_FALLTHROUGH; \ |
| case 2: \ |
| pixel_copy_increment; \ |
| SDL_FALLTHROUGH; \ |
| case 1: \ |
| pixel_copy_increment; \ |
| } while (--n > 0); \ |
| } \ |
| } |
| |
| // 2-times unrolled loop |
| #define DUFFS_LOOP2(pixel_copy_increment, width) \ |
| { \ |
| int n = (width + 1) / 2; \ |
| switch (width & 1) { \ |
| case 0: \ |
| do { \ |
| pixel_copy_increment; \ |
| SDL_FALLTHROUGH; \ |
| case 1: \ |
| pixel_copy_increment; \ |
| } while (--n > 0); \ |
| } \ |
| } |
| |
| // Use the 4-times version of the loop by default |
| #define DUFFS_LOOP(pixel_copy_increment, width) \ |
| DUFFS_LOOP4(pixel_copy_increment, width) |
| // Use the 8-times version of the loop for simple routines |
| #define DUFFS_LOOP_TRIVIAL(pixel_copy_increment, width) \ |
| DUFFS_LOOP8(pixel_copy_increment, width) |
| |
| // Special version of Duff's device for even more optimization |
| #define DUFFS_LOOP_124(pixel_copy_increment1, \ |
| pixel_copy_increment2, \ |
| pixel_copy_increment4, width) \ |
| { \ |
| int n = width; \ |
| if (n & 1) { \ |
| pixel_copy_increment1; \ |
| n -= 1; \ |
| } \ |
| if (n & 2) { \ |
| pixel_copy_increment2; \ |
| n -= 2; \ |
| } \ |
| if (n & 4) { \ |
| pixel_copy_increment4; \ |
| n -= 4; \ |
| } \ |
| if (n) { \ |
| n /= 8; \ |
| do { \ |
| pixel_copy_increment4; \ |
| pixel_copy_increment4; \ |
| } while (--n > 0); \ |
| } \ |
| } |
| |
| #else |
| |
| // Don't use Duff's device to unroll loops |
| #define DUFFS_LOOP(pixel_copy_increment, width) \ |
| DUFFS_LOOP1(pixel_copy_increment, width) |
| #define DUFFS_LOOP_TRIVIAL(pixel_copy_increment, width) \ |
| DUFFS_LOOP1(pixel_copy_increment, width) |
| #define DUFFS_LOOP8(pixel_copy_increment, width) \ |
| DUFFS_LOOP1(pixel_copy_increment, width) |
| #define DUFFS_LOOP4(pixel_copy_increment, width) \ |
| DUFFS_LOOP1(pixel_copy_increment, width) |
| #define DUFFS_LOOP2(pixel_copy_increment, width) \ |
| DUFFS_LOOP1(pixel_copy_increment, width) |
| #define DUFFS_LOOP_124(pixel_copy_increment1, \ |
| pixel_copy_increment2, \ |
| pixel_copy_increment4, width) \ |
| DUFFS_LOOP1(pixel_copy_increment1, width) |
| |
| #endif // USE_DUFFS_LOOP |
| |
| #if defined(_MSC_VER) && (_MSC_VER >= 600) |
| #pragma warning(disable : 4244) // '=': conversion from 'X' to 'Y', possible loss of data |
| #endif |
| |
| #endif // SDL_blit_h_ |
