mirror of
https://github.com/Relintai/sdl2_frt.git
synced 2024-12-20 22:16:49 +01:00
484 lines
12 KiB
C
484 lines
12 KiB
C
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/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2015 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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#include "../SDL_internal.h"
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#include "SDL_video.h"
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#include "SDL_blit.h"
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/* Functions to blit from bitmaps to other surfaces */
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static void
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BlitBto1(SDL_BlitInfo * info)
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{
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int c;
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int width, height;
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Uint8 *src, *map, *dst;
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int srcskip, dstskip;
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/* Set up some basic variables */
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width = info->dst_w;
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height = info->dst_h;
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src = info->src;
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srcskip = info->src_skip;
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dst = info->dst;
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dstskip = info->dst_skip;
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map = info->table;
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srcskip += width - (width + 7) / 8;
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if (map) {
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while (height--) {
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Uint8 byte = 0, bit;
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for (c = 0; c < width; ++c) {
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if ((c & 7) == 0) {
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byte = *src++;
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}
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bit = (byte & 0x80) >> 7;
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if (1) {
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*dst = map[bit];
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}
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dst++;
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byte <<= 1;
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}
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src += srcskip;
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dst += dstskip;
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}
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} else {
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while (height--) {
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Uint8 byte = 0, bit;
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for (c = 0; c < width; ++c) {
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if ((c & 7) == 0) {
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byte = *src++;
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}
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bit = (byte & 0x80) >> 7;
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if (1) {
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*dst = bit;
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}
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dst++;
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byte <<= 1;
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}
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src += srcskip;
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dst += dstskip;
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}
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}
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}
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static void
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BlitBto2(SDL_BlitInfo * info)
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{
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int c;
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int width, height;
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Uint8 *src;
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Uint16 *map, *dst;
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int srcskip, dstskip;
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/* Set up some basic variables */
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width = info->dst_w;
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height = info->dst_h;
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src = info->src;
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srcskip = info->src_skip;
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dst = (Uint16 *) info->dst;
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dstskip = info->dst_skip / 2;
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map = (Uint16 *) info->table;
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srcskip += width - (width + 7) / 8;
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while (height--) {
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Uint8 byte = 0, bit;
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for (c = 0; c < width; ++c) {
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if ((c & 7) == 0) {
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byte = *src++;
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}
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bit = (byte & 0x80) >> 7;
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if (1) {
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*dst = map[bit];
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}
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byte <<= 1;
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dst++;
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}
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src += srcskip;
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dst += dstskip;
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}
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}
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static void
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BlitBto3(SDL_BlitInfo * info)
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{
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int c, o;
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int width, height;
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Uint8 *src, *map, *dst;
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int srcskip, dstskip;
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/* Set up some basic variables */
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width = info->dst_w;
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height = info->dst_h;
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src = info->src;
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srcskip = info->src_skip;
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dst = info->dst;
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dstskip = info->dst_skip;
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map = info->table;
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srcskip += width - (width + 7) / 8;
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while (height--) {
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Uint8 byte = 0, bit;
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for (c = 0; c < width; ++c) {
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if ((c & 7) == 0) {
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byte = *src++;
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}
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bit = (byte & 0x80) >> 7;
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if (1) {
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o = bit * 4;
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dst[0] = map[o++];
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dst[1] = map[o++];
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dst[2] = map[o++];
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}
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byte <<= 1;
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dst += 3;
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}
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src += srcskip;
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dst += dstskip;
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}
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}
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static void
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BlitBto4(SDL_BlitInfo * info)
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{
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int width, height;
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Uint8 *src;
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Uint32 *map, *dst;
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int srcskip, dstskip;
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int c;
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/* Set up some basic variables */
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width = info->dst_w;
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height = info->dst_h;
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src = info->src;
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srcskip = info->src_skip;
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dst = (Uint32 *) info->dst;
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dstskip = info->dst_skip / 4;
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map = (Uint32 *) info->table;
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srcskip += width - (width + 7) / 8;
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while (height--) {
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Uint8 byte = 0, bit;
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for (c = 0; c < width; ++c) {
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if ((c & 7) == 0) {
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byte = *src++;
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}
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bit = (byte & 0x80) >> 7;
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if (1) {
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*dst = map[bit];
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}
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byte <<= 1;
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dst++;
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}
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src += srcskip;
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dst += dstskip;
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}
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}
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static void
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BlitBto1Key(SDL_BlitInfo * info)
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{
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int width = info->dst_w;
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int height = info->dst_h;
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Uint8 *src = info->src;
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Uint8 *dst = info->dst;
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int srcskip = info->src_skip;
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int dstskip = info->dst_skip;
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Uint32 ckey = info->colorkey;
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Uint8 *palmap = info->table;
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int c;
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/* Set up some basic variables */
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srcskip += width - (width + 7) / 8;
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if (palmap) {
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while (height--) {
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Uint8 byte = 0, bit;
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for (c = 0; c < width; ++c) {
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if ((c & 7) == 0) {
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byte = *src++;
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}
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bit = (byte & 0x80) >> 7;
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if (bit != ckey) {
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*dst = palmap[bit];
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}
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dst++;
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byte <<= 1;
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}
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src += srcskip;
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dst += dstskip;
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}
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} else {
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while (height--) {
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Uint8 byte = 0, bit;
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for (c = 0; c < width; ++c) {
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if ((c & 7) == 0) {
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byte = *src++;
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}
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bit = (byte & 0x80) >> 7;
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if (bit != ckey) {
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*dst = bit;
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}
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dst++;
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byte <<= 1;
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}
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src += srcskip;
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dst += dstskip;
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}
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}
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}
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static void
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BlitBto2Key(SDL_BlitInfo * info)
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{
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int width = info->dst_w;
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int height = info->dst_h;
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Uint8 *src = info->src;
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Uint16 *dstp = (Uint16 *) info->dst;
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int srcskip = info->src_skip;
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int dstskip = info->dst_skip;
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Uint32 ckey = info->colorkey;
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Uint8 *palmap = info->table;
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int c;
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/* Set up some basic variables */
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srcskip += width - (width + 7) / 8;
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dstskip /= 2;
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while (height--) {
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Uint8 byte = 0, bit;
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for (c = 0; c < width; ++c) {
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if ((c & 7) == 0) {
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byte = *src++;
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}
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bit = (byte & 0x80) >> 7;
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if (bit != ckey) {
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*dstp = ((Uint16 *) palmap)[bit];
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}
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byte <<= 1;
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dstp++;
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}
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src += srcskip;
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dstp += dstskip;
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}
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}
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static void
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BlitBto3Key(SDL_BlitInfo * info)
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{
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int width = info->dst_w;
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int height = info->dst_h;
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Uint8 *src = info->src;
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Uint8 *dst = info->dst;
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int srcskip = info->src_skip;
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int dstskip = info->dst_skip;
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Uint32 ckey = info->colorkey;
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Uint8 *palmap = info->table;
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int c;
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/* Set up some basic variables */
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srcskip += width - (width + 7) / 8;
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while (height--) {
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Uint8 byte = 0, bit;
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for (c = 0; c < width; ++c) {
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if ((c & 7) == 0) {
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byte = *src++;
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}
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bit = (byte & 0x80) >> 7;
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if (bit != ckey) {
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SDL_memcpy(dst, &palmap[bit * 4], 3);
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}
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byte <<= 1;
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dst += 3;
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}
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src += srcskip;
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dst += dstskip;
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}
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}
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static void
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BlitBto4Key(SDL_BlitInfo * info)
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{
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int width = info->dst_w;
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int height = info->dst_h;
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Uint8 *src = info->src;
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Uint32 *dstp = (Uint32 *) info->dst;
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int srcskip = info->src_skip;
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int dstskip = info->dst_skip;
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Uint32 ckey = info->colorkey;
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Uint8 *palmap = info->table;
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int c;
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/* Set up some basic variables */
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srcskip += width - (width + 7) / 8;
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dstskip /= 4;
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while (height--) {
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Uint8 byte = 0, bit;
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for (c = 0; c < width; ++c) {
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if ((c & 7) == 0) {
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byte = *src++;
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}
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bit = (byte & 0x80) >> 7;
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if (bit != ckey) {
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*dstp = ((Uint32 *) palmap)[bit];
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}
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byte <<= 1;
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dstp++;
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}
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src += srcskip;
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dstp += dstskip;
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}
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}
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static void
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BlitBtoNAlpha(SDL_BlitInfo * info)
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{
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int width = info->dst_w;
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int height = info->dst_h;
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Uint8 *src = info->src;
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Uint8 *dst = info->dst;
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int srcskip = info->src_skip;
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int dstskip = info->dst_skip;
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const SDL_Color *srcpal = info->src_fmt->palette->colors;
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SDL_PixelFormat *dstfmt = info->dst_fmt;
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int dstbpp;
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int c;
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Uint32 pixel;
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unsigned sR, sG, sB;
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unsigned dR, dG, dB, dA;
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const unsigned A = info->a;
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/* Set up some basic variables */
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dstbpp = dstfmt->BytesPerPixel;
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srcskip += width - (width + 7) / 8;
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while (height--) {
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Uint8 byte = 0, bit;
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for (c = 0; c < width; ++c) {
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if ((c & 7) == 0) {
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byte = *src++;
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}
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bit = (byte & 0x80) >> 7;
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if (1) {
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sR = srcpal[bit].r;
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sG = srcpal[bit].g;
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sB = srcpal[bit].b;
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DISEMBLE_RGBA(dst, dstbpp, dstfmt, pixel, dR, dG, dB, dA);
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ALPHA_BLEND_RGBA(sR, sG, sB, A, dR, dG, dB, dA);
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ASSEMBLE_RGBA(dst, dstbpp, dstfmt, dR, dG, dB, dA);
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}
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byte <<= 1;
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dst += dstbpp;
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}
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src += srcskip;
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dst += dstskip;
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}
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}
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static void
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BlitBtoNAlphaKey(SDL_BlitInfo * info)
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{
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|
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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;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* vi: set ts=4 sw=4 expandtab: */
|