| /* |
| Simple DirectMedia Layer |
| Copyright (C) 1997-2021 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" |
| |
| #if SDL_HAVE_BLIT_0 |
| |
| #include "SDL_video.h" |
| #include "SDL_blit.h" |
| |
| /* Functions to blit from bitmaps to other surfaces */ |
| |
| static void |
| BlitBto1(SDL_BlitInfo * info) |
| { |
| int c; |
| int width, height; |
| Uint8 *src, *map, *dst; |
| int srcskip, dstskip; |
| |
| /* Set up some basic variables */ |
| width = info->dst_w; |
| height = info->dst_h; |
| src = info->src; |
| srcskip = info->src_skip; |
| dst = info->dst; |
| dstskip = info->dst_skip; |
| map = info->table; |
| srcskip += width - (width + 7) / 8; |
| |
| if (map) { |
| while (height--) { |
| Uint8 byte = 0, bit; |
| for (c = 0; c < width; ++c) { |
| if ((c & 7) == 0) { |
| byte = *src++; |
| } |
| bit = (byte & 0x80) >> 7; |
| if (1) { |
| *dst = map[bit]; |
| } |
| dst++; |
| byte <<= 1; |
| } |
| src += srcskip; |
| dst += dstskip; |
| } |
| } else { |
| while (height--) { |
| Uint8 byte = 0, bit; |
| for (c = 0; c < width; ++c) { |
| if ((c & 7) == 0) { |
| byte = *src++; |
| } |
| bit = (byte & 0x80) >> 7; |
| if (1) { |
| *dst = bit; |
| } |
| dst++; |
| byte <<= 1; |
| } |
| src += srcskip; |
| dst += dstskip; |
| } |
| } |
| } |
| |
| static void |
| BlitBto2(SDL_BlitInfo * info) |
| { |
| int c; |
| int width, height; |
| Uint8 *src; |
| Uint16 *map, *dst; |
| int srcskip, dstskip; |
| |
| /* Set up some basic variables */ |
| width = info->dst_w; |
| height = info->dst_h; |
| src = info->src; |
| srcskip = info->src_skip; |
| dst = (Uint16 *) info->dst; |
| dstskip = info->dst_skip / 2; |
| map = (Uint16 *) info->table; |
| srcskip += width - (width + 7) / 8; |
| |
| while (height--) { |
| Uint8 byte = 0, bit; |
| for (c = 0; c < width; ++c) { |
| if ((c & 7) == 0) { |
| byte = *src++; |
| } |
| bit = (byte & 0x80) >> 7; |
| if (1) { |
| *dst = map[bit]; |
| } |
| byte <<= 1; |
| dst++; |
| } |
| src += srcskip; |
| dst += dstskip; |
| } |
| } |
| |
| static void |
| BlitBto3(SDL_BlitInfo * info) |
| { |
| int c, o; |
| int width, height; |
| Uint8 *src, *map, *dst; |
| int srcskip, dstskip; |
| |
| /* Set up some basic variables */ |
| width = info->dst_w; |
| height = info->dst_h; |
| src = info->src; |
| srcskip = info->src_skip; |
| dst = info->dst; |
| dstskip = info->dst_skip; |
| map = info->table; |
| srcskip += width - (width + 7) / 8; |
| |
| while (height--) { |
| Uint8 byte = 0, bit; |
| for (c = 0; c < width; ++c) { |
| if ((c & 7) == 0) { |
| byte = *src++; |
| } |
| bit = (byte & 0x80) >> 7; |
| if (1) { |
| o = bit * 4; |
| dst[0] = map[o++]; |
| dst[1] = map[o++]; |
| dst[2] = map[o++]; |
| } |
| byte <<= 1; |
| dst += 3; |
| } |
| src += srcskip; |
| dst += dstskip; |
| } |
| } |
| |
| static void |
| BlitBto4(SDL_BlitInfo * info) |
| { |
| int width, height; |
| Uint8 *src; |
| Uint32 *map, *dst; |
| int srcskip, dstskip; |
| int c; |
| |
| /* Set up some basic variables */ |
| width = info->dst_w; |
| height = info->dst_h; |
| src = info->src; |
| srcskip = info->src_skip; |
| dst = (Uint32 *) info->dst; |
| dstskip = info->dst_skip / 4; |
| map = (Uint32 *) info->table; |
| srcskip += width - (width + 7) / 8; |
| |
| while (height--) { |
| Uint8 byte = 0, bit; |
| for (c = 0; c < width; ++c) { |
| if ((c & 7) == 0) { |
| byte = *src++; |
| } |
| bit = (byte & 0x80) >> 7; |
| if (1) { |
| *dst = map[bit]; |
| } |
| byte <<= 1; |
| dst++; |
| } |
| src += srcskip; |
| dst += dstskip; |
| } |
| } |
| |
| static void |
| BlitBto1Key(SDL_BlitInfo * info) |
| { |
| int width = info->dst_w; |
| int height = info->dst_h; |
| Uint8 *src = info->src; |
| Uint8 *dst = info->dst; |
| int srcskip = info->src_skip; |
| int dstskip = info->dst_skip; |
| Uint32 ckey = info->colorkey; |
| Uint8 *palmap = info->table; |
| int c; |
| |
| /* Set up some basic variables */ |
| srcskip += width - (width + 7) / 8; |
| |
| if (palmap) { |
| while (height--) { |
| Uint8 byte = 0, bit; |
| for (c = 0; c < width; ++c) { |
| if ((c & 7) == 0) { |
| byte = *src++; |
| } |
| bit = (byte & 0x80) >> 7; |
| if (bit != ckey) { |
| *dst = palmap[bit]; |
| } |
| dst++; |
| byte <<= 1; |
| } |
| src += srcskip; |
| dst += dstskip; |
| } |
| } else { |
| while (height--) { |
| Uint8 byte = 0, bit; |
| for (c = 0; c < width; ++c) { |
| if ((c & 7) == 0) { |
| byte = *src++; |
| } |
| bit = (byte & 0x80) >> 7; |
| if (bit != ckey) { |
| *dst = bit; |
| } |
| dst++; |
| byte <<= 1; |
| } |
| src += srcskip; |
| dst += dstskip; |
| } |
| } |
| } |
| |
| static void |
| BlitBto2Key(SDL_BlitInfo * info) |
| { |
| int width = info->dst_w; |
| int height = info->dst_h; |
| Uint8 *src = info->src; |
| Uint16 *dstp = (Uint16 *) info->dst; |
| int srcskip = info->src_skip; |
| int dstskip = info->dst_skip; |
| Uint32 ckey = info->colorkey; |
| Uint8 *palmap = info->table; |
| int c; |
| |
| /* Set up some basic variables */ |
| srcskip += width - (width + 7) / 8; |
| dstskip /= 2; |
| |
| while (height--) { |
| Uint8 byte = 0, bit; |
| for (c = 0; c < width; ++c) { |
| if ((c & 7) == 0) { |
| byte = *src++; |
| } |
| bit = (byte & 0x80) >> 7; |
| if (bit != ckey) { |
| *dstp = ((Uint16 *) palmap)[bit]; |
| } |
| byte <<= 1; |
| dstp++; |
| } |
| src += srcskip; |
| dstp += dstskip; |
| } |
| } |
| |
| static void |
| BlitBto3Key(SDL_BlitInfo * info) |
| { |
| int width = info->dst_w; |
| int height = info->dst_h; |
| Uint8 *src = info->src; |
| Uint8 *dst = info->dst; |
| int srcskip = info->src_skip; |
| int dstskip = info->dst_skip; |
| Uint32 ckey = info->colorkey; |
| Uint8 *palmap = info->table; |
| int c; |
| |
| /* Set up some basic variables */ |
| srcskip += width - (width + 7) / 8; |
| |
| while (height--) { |
| Uint8 byte = 0, bit; |
| for (c = 0; c < width; ++c) { |
| if ((c & 7) == 0) { |
| byte = *src++; |
| } |
| bit = (byte & 0x80) >> 7; |
| if (bit != ckey) { |
| SDL_memcpy(dst, &palmap[bit * 4], 3); |
| } |
| byte <<= 1; |
| dst += 3; |
| } |
| src += srcskip; |
| dst += dstskip; |
| } |
| } |
| |
| static void |
| BlitBto4Key(SDL_BlitInfo * info) |
| { |
| int width = info->dst_w; |
| int height = info->dst_h; |
| Uint8 *src = info->src; |
| Uint32 *dstp = (Uint32 *) info->dst; |
| int srcskip = info->src_skip; |
| int dstskip = info->dst_skip; |
| Uint32 ckey = info->colorkey; |
| Uint8 *palmap = info->table; |
| int c; |
| |
| /* Set up some basic variables */ |
| srcskip += width - (width + 7) / 8; |
| dstskip /= 4; |
| |
| while (height--) { |
| Uint8 byte = 0, bit; |
| for (c = 0; c < width; ++c) { |
| if ((c & 7) == 0) { |
| byte = *src++; |
| } |
| bit = (byte & 0x80) >> 7; |
| if (bit != ckey) { |
| *dstp = ((Uint32 *) palmap)[bit]; |
| } |
| byte <<= 1; |
| dstp++; |
| } |
| src += srcskip; |
| dstp += dstskip; |
| } |
| } |
| |
| static void |
| BlitBtoNAlpha(SDL_BlitInfo * info) |
| { |
| int width = info->dst_w; |
| int height = info->dst_h; |
| Uint8 *src = info->src; |
| Uint8 *dst = info->dst; |
| int srcskip = info->src_skip; |
| int dstskip = info->dst_skip; |
| const SDL_Color *srcpal = info->src_fmt->palette->colors; |
| SDL_PixelFormat *dstfmt = info->dst_fmt; |
| int dstbpp; |
| int c; |
| Uint32 pixel; |
| unsigned sR, sG, sB; |
| unsigned dR, dG, dB, dA; |
| const unsigned A = info->a; |
| |
| /* Set up some basic variables */ |
| dstbpp = dstfmt->BytesPerPixel; |
| srcskip += width - (width + 7) / 8; |
| |
| while (height--) { |
| Uint8 byte = 0, bit; |
| for (c = 0; c < width; ++c) { |
| if ((c & 7) == 0) { |
| byte = *src++; |
| } |
| bit = (byte & 0x80) >> 7; |
| if (1) { |
| sR = srcpal[bit].r; |
| sG = srcpal[bit].g; |
| sB = srcpal[bit].b; |
| DISEMBLE_RGBA(dst, dstbpp, dstfmt, pixel, dR, dG, dB, dA); |
| ALPHA_BLEND_RGBA(sR, sG, sB, A, dR, dG, dB, dA); |
| ASSEMBLE_RGBA(dst, dstbpp, dstfmt, dR, dG, dB, dA); |
| } |
| byte <<= 1; |
| dst += dstbpp; |
| } |
| src += srcskip; |
| dst += dstskip; |
| } |
| } |
| |
| static void |
| BlitBtoNAlphaKey(SDL_BlitInfo * info) |
| { |
| int width = info->dst_w; |
| int height = info->dst_h; |
| Uint8 *src = info->src; |
| Uint8 *dst = info->dst; |
| int srcskip = info->src_skip; |
| int dstskip = info->dst_skip; |
| SDL_PixelFormat *srcfmt = info->src_fmt; |
| SDL_PixelFormat *dstfmt = info->dst_fmt; |
| const SDL_Color *srcpal = srcfmt->palette->colors; |
| int dstbpp; |
| int c; |
| Uint32 pixel; |
| unsigned sR, sG, sB; |
| unsigned dR, dG, dB, dA; |
| const unsigned A = info->a; |
| Uint32 ckey = info->colorkey; |
| |
| /* Set up some basic variables */ |
| dstbpp = dstfmt->BytesPerPixel; |
| srcskip += width - (width + 7) / 8; |
| |
| while (height--) { |
| Uint8 byte = 0, bit; |
| for (c = 0; c < width; ++c) { |
| if ((c & 7) == 0) { |
| byte = *src++; |
| } |
| bit = (byte & 0x80) >> 7; |
| if (bit != ckey) { |
| sR = srcpal[bit].r; |
| sG = srcpal[bit].g; |
| sB = srcpal[bit].b; |
| DISEMBLE_RGBA(dst, dstbpp, dstfmt, pixel, dR, dG, dB, dA); |
| ALPHA_BLEND_RGBA(sR, sG, sB, A, dR, dG, dB, dA); |
| ASSEMBLE_RGBA(dst, dstbpp, dstfmt, dR, dG, dB, dA); |
| } |
| byte <<= 1; |
| dst += dstbpp; |
| } |
| src += srcskip; |
| dst += dstskip; |
| } |
| } |
| |
| static const SDL_BlitFunc bitmap_blit[] = { |
| (SDL_BlitFunc) NULL, BlitBto1, BlitBto2, BlitBto3, BlitBto4 |
| }; |
| |
| static const SDL_BlitFunc colorkey_blit[] = { |
| (SDL_BlitFunc) NULL, BlitBto1Key, BlitBto2Key, BlitBto3Key, BlitBto4Key |
| }; |
| |
| SDL_BlitFunc |
| SDL_CalculateBlit0(SDL_Surface * surface) |
| { |
| int which; |
| |
| if (surface->format->BitsPerPixel != 1) { |
| /* We don't support sub 8-bit packed pixel modes */ |
| return (SDL_BlitFunc) NULL; |
| } |
| if (surface->map->dst->format->BitsPerPixel < 8) { |
| which = 0; |
| } else { |
| which = surface->map->dst->format->BytesPerPixel; |
| } |
| switch (surface->map->info.flags & ~SDL_COPY_RLE_MASK) { |
| case 0: |
| return bitmap_blit[which]; |
| |
| case SDL_COPY_COLORKEY: |
| return colorkey_blit[which]; |
| |
| case SDL_COPY_MODULATE_ALPHA | SDL_COPY_BLEND: |
| return which >= 2 ? BlitBtoNAlpha : (SDL_BlitFunc) NULL; |
| |
| case SDL_COPY_COLORKEY | SDL_COPY_MODULATE_ALPHA | SDL_COPY_BLEND: |
| return which >= 2 ? BlitBtoNAlphaKey : (SDL_BlitFunc) NULL; |
| } |
| return (SDL_BlitFunc) NULL; |
| } |
| |
| #endif /* SDL_HAVE_BLIT_0 */ |
| |
| /* vi: set ts=4 sw=4 expandtab: */ |
