mirror of
https://github.com/Relintai/sdl2_frt.git
synced 2024-12-20 22:16:49 +01:00
557 lines
13 KiB
C
557 lines
13 KiB
C
/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2020 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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#if SDL_HAVE_BLIT_1
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#include "SDL_video.h"
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#include "SDL_blit.h"
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#include "SDL_sysvideo.h"
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#include "SDL_endian.h"
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/* Functions to blit from 8-bit surfaces to other surfaces */
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static void
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Blit1to1(SDL_BlitInfo * info)
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{
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#ifndef USE_DUFFS_LOOP
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int c;
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#endif
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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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while (height--) {
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#ifdef USE_DUFFS_LOOP
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/* *INDENT-OFF* */
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DUFFS_LOOP(
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{
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*dst = map[*src];
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}
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dst++;
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src++;
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, width);
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/* *INDENT-ON* */
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#else
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for (c = width; c; --c) {
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*dst = map[*src];
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dst++;
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src++;
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}
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#endif
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src += srcskip;
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dst += dstskip;
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}
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}
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/* This is now endian dependent */
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#ifndef USE_DUFFS_LOOP
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# if ( SDL_BYTEORDER == SDL_LIL_ENDIAN )
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# define HI 1
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# define LO 0
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# else /* ( SDL_BYTEORDER == SDL_BIG_ENDIAN ) */
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# define HI 0
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# define LO 1
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# endif
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#endif
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static void
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Blit1to2(SDL_BlitInfo * info)
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{
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#ifndef USE_DUFFS_LOOP
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int c;
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#endif
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int width, height;
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Uint8 *src, *dst;
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Uint16 *map;
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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 = (Uint16 *) info->table;
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#ifdef USE_DUFFS_LOOP
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while (height--) {
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/* *INDENT-OFF* */
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DUFFS_LOOP(
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{
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*(Uint16 *)dst = map[*src++];
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dst += 2;
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},
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width);
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/* *INDENT-ON* */
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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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/* Memory align at 4-byte boundary, if necessary */
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if ((long) dst & 0x03) {
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/* Don't do anything if width is 0 */
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if (width == 0) {
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return;
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}
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--width;
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while (height--) {
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/* Perform copy alignment */
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*(Uint16 *) dst = map[*src++];
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dst += 2;
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/* Copy in 4 pixel chunks */
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for (c = width / 4; c; --c) {
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*(Uint32 *) dst = (map[src[HI]] << 16) | (map[src[LO]]);
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src += 2;
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dst += 4;
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*(Uint32 *) dst = (map[src[HI]] << 16) | (map[src[LO]]);
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src += 2;
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dst += 4;
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}
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/* Get any leftovers */
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switch (width & 3) {
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case 3:
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*(Uint16 *) dst = map[*src++];
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dst += 2;
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case 2:
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*(Uint32 *) dst = (map[src[HI]] << 16) | (map[src[LO]]);
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src += 2;
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dst += 4;
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break;
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case 1:
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*(Uint16 *) dst = map[*src++];
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dst += 2;
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break;
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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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/* Copy in 4 pixel chunks */
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for (c = width / 4; c; --c) {
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*(Uint32 *) dst = (map[src[HI]] << 16) | (map[src[LO]]);
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src += 2;
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dst += 4;
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*(Uint32 *) dst = (map[src[HI]] << 16) | (map[src[LO]]);
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src += 2;
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dst += 4;
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}
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/* Get any leftovers */
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switch (width & 3) {
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case 3:
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*(Uint16 *) dst = map[*src++];
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dst += 2;
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case 2:
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*(Uint32 *) dst = (map[src[HI]] << 16) | (map[src[LO]]);
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src += 2;
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dst += 4;
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break;
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case 1:
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*(Uint16 *) dst = map[*src++];
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dst += 2;
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break;
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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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#endif /* USE_DUFFS_LOOP */
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}
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static void
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Blit1to3(SDL_BlitInfo * info)
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{
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#ifndef USE_DUFFS_LOOP
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int c;
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#endif
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int 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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while (height--) {
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#ifdef USE_DUFFS_LOOP
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/* *INDENT-OFF* */
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DUFFS_LOOP(
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{
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o = *src * 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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src++;
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dst += 3;
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, width);
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/* *INDENT-ON* */
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#else
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for (c = width; c; --c) {
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o = *src * 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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src++;
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dst += 3;
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}
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#endif /* USE_DUFFS_LOOP */
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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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Blit1to4(SDL_BlitInfo * info)
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{
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#ifndef USE_DUFFS_LOOP
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int c;
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#endif
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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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/* 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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while (height--) {
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#ifdef USE_DUFFS_LOOP
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/* *INDENT-OFF* */
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DUFFS_LOOP(
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*dst++ = map[*src++];
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, width);
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/* *INDENT-ON* */
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#else
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for (c = width / 4; c; --c) {
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*dst++ = map[*src++];
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*dst++ = map[*src++];
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*dst++ = map[*src++];
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*dst++ = map[*src++];
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}
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switch (width & 3) {
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case 3:
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*dst++ = map[*src++];
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case 2:
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*dst++ = map[*src++];
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case 1:
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*dst++ = map[*src++];
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}
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#endif /* USE_DUFFS_LOOP */
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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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Blit1to1Key(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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int srcskip = info->src_skip;
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Uint8 *dst = info->dst;
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int dstskip = info->dst_skip;
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Uint8 *palmap = info->table;
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Uint32 ckey = info->colorkey;
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if (palmap) {
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while (height--) {
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/* *INDENT-OFF* */
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DUFFS_LOOP(
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{
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if ( *src != ckey ) {
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*dst = palmap[*src];
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}
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dst++;
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src++;
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},
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width);
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/* *INDENT-ON* */
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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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/* *INDENT-OFF* */
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DUFFS_LOOP(
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{
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if ( *src != ckey ) {
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*dst = *src;
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}
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dst++;
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src++;
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},
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width);
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/* *INDENT-ON* */
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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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Blit1to2Key(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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int srcskip = info->src_skip;
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Uint16 *dstp = (Uint16 *) info->dst;
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int dstskip = info->dst_skip;
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Uint16 *palmap = (Uint16 *) info->table;
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Uint32 ckey = info->colorkey;
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/* Set up some basic variables */
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dstskip /= 2;
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while (height--) {
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/* *INDENT-OFF* */
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DUFFS_LOOP(
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{
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if ( *src != ckey ) {
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*dstp=palmap[*src];
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}
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src++;
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dstp++;
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},
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width);
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/* *INDENT-ON* */
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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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Blit1to3Key(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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int srcskip = info->src_skip;
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Uint8 *dst = info->dst;
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int dstskip = info->dst_skip;
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Uint8 *palmap = info->table;
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Uint32 ckey = info->colorkey;
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int o;
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while (height--) {
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/* *INDENT-OFF* */
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DUFFS_LOOP(
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{
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if ( *src != ckey ) {
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o = *src * 4;
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dst[0] = palmap[o++];
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dst[1] = palmap[o++];
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dst[2] = palmap[o++];
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}
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src++;
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dst += 3;
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},
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width);
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/* *INDENT-ON* */
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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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Blit1to4Key(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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int srcskip = info->src_skip;
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Uint32 *dstp = (Uint32 *) info->dst;
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int dstskip = info->dst_skip;
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Uint32 *palmap = (Uint32 *) info->table;
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Uint32 ckey = info->colorkey;
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/* Set up some basic variables */
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dstskip /= 4;
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while (height--) {
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/* *INDENT-OFF* */
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DUFFS_LOOP(
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{
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if ( *src != ckey ) {
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*dstp = palmap[*src];
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}
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src++;
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dstp++;
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},
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width);
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/* *INDENT-ON* */
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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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Blit1toNAlpha(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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int srcskip = info->src_skip;
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Uint8 *dst = info->dst;
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int dstskip = info->dst_skip;
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SDL_PixelFormat *dstfmt = info->dst_fmt;
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const SDL_Color *srcpal = info->src_fmt->palette->colors;
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int dstbpp;
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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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while (height--) {
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/* *INDENT-OFF* */
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DUFFS_LOOP4(
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{
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sR = srcpal[*src].r;
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sG = srcpal[*src].g;
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sB = srcpal[*src].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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src++;
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dst += dstbpp;
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},
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width);
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/* *INDENT-ON* */
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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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Blit1toNAlphaKey(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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int srcskip = info->src_skip;
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Uint8 *dst = info->dst;
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int dstskip = info->dst_skip;
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SDL_PixelFormat *dstfmt = info->dst_fmt;
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const SDL_Color *srcpal = info->src_fmt->palette->colors;
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Uint32 ckey = info->colorkey;
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int dstbpp;
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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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while (height--) {
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/* *INDENT-OFF* */
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DUFFS_LOOP(
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{
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if ( *src != ckey ) {
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sR = srcpal[*src].r;
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sG = srcpal[*src].g;
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sB = srcpal[*src].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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src++;
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dst += dstbpp;
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},
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width);
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/* *INDENT-ON* */
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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 const SDL_BlitFunc one_blit[] = {
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(SDL_BlitFunc) NULL, Blit1to1, Blit1to2, Blit1to3, Blit1to4
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};
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static const SDL_BlitFunc one_blitkey[] = {
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(SDL_BlitFunc) NULL, Blit1to1Key, Blit1to2Key, Blit1to3Key, Blit1to4Key
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};
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SDL_BlitFunc
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SDL_CalculateBlit1(SDL_Surface * surface)
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{
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int which;
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SDL_PixelFormat *dstfmt;
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dstfmt = surface->map->dst->format;
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if (dstfmt->BitsPerPixel < 8) {
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which = 0;
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} else {
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which = dstfmt->BytesPerPixel;
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}
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switch (surface->map->info.flags & ~SDL_COPY_RLE_MASK) {
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case 0:
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return one_blit[which];
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case SDL_COPY_COLORKEY:
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return one_blitkey[which];
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case SDL_COPY_MODULATE_ALPHA | SDL_COPY_BLEND:
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/* Supporting 8bpp->8bpp alpha is doable but requires lots of
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tables which consume space and takes time to precompute,
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so is better left to the user */
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return which >= 2 ? Blit1toNAlpha : (SDL_BlitFunc) NULL;
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case SDL_COPY_COLORKEY | SDL_COPY_MODULATE_ALPHA | SDL_COPY_BLEND:
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return which >= 2 ? Blit1toNAlphaKey : (SDL_BlitFunc) NULL;
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}
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return (SDL_BlitFunc) NULL;
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}
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#endif /* SDL_HAVE_BLIT_1 */
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/* vi: set ts=4 sw=4 expandtab: */
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