257 lines
6.7 KiB
C
257 lines
6.7 KiB
C
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/*
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SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2009 Sam Lantinga
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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Sam Lantinga
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slouken@libsdl.org
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*/
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#include "SDL_config.h"
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#include "SDL_draw.h"
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static int
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SDL_BlendPoint_RGB555(SDL_Surface * dst, int x, int y, int blendMode, Uint8 r,
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Uint8 g, Uint8 b, Uint8 a)
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{
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unsigned inva = 0xff - a;
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switch (blendMode) {
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case SDL_BLENDMODE_BLEND:
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DRAW_SETPIXELXY_BLEND_RGB555(x, y);
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break;
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case SDL_BLENDMODE_ADD:
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DRAW_SETPIXELXY_ADD_RGB555(x, y);
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break;
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case SDL_BLENDMODE_MOD:
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DRAW_SETPIXELXY_MOD_RGB555(x, y);
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break;
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default:
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DRAW_SETPIXELXY_RGB555(x, y);
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break;
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}
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return 0;
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}
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static int
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SDL_BlendPoint_RGB565(SDL_Surface * dst, int x, int y, int blendMode, Uint8 r,
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Uint8 g, Uint8 b, Uint8 a)
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{
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unsigned inva = 0xff - a;
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switch (blendMode) {
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case SDL_BLENDMODE_BLEND:
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DRAW_SETPIXELXY_BLEND_RGB565(x, y);
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break;
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case SDL_BLENDMODE_ADD:
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DRAW_SETPIXELXY_ADD_RGB565(x, y);
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break;
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case SDL_BLENDMODE_MOD:
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DRAW_SETPIXELXY_MOD_RGB565(x, y);
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break;
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default:
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DRAW_SETPIXELXY_RGB565(x, y);
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break;
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}
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return 0;
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}
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static int
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SDL_BlendPoint_RGB888(SDL_Surface * dst, int x, int y, int blendMode, Uint8 r,
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Uint8 g, Uint8 b, Uint8 a)
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{
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unsigned inva = 0xff - a;
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switch (blendMode) {
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case SDL_BLENDMODE_BLEND:
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DRAW_SETPIXELXY_BLEND_RGB888(x, y);
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break;
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case SDL_BLENDMODE_ADD:
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DRAW_SETPIXELXY_ADD_RGB888(x, y);
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break;
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case SDL_BLENDMODE_MOD:
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DRAW_SETPIXELXY_MOD_RGB888(x, y);
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break;
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default:
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DRAW_SETPIXELXY_RGB888(x, y);
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break;
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}
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return 0;
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}
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static int
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SDL_BlendPoint_ARGB8888(SDL_Surface * dst, int x, int y, int blendMode,
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Uint8 r, Uint8 g, Uint8 b, Uint8 a)
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{
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unsigned inva = 0xff - a;
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switch (blendMode) {
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case SDL_BLENDMODE_BLEND:
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DRAW_SETPIXELXY_BLEND_ARGB8888(x, y);
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break;
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case SDL_BLENDMODE_ADD:
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DRAW_SETPIXELXY_ADD_ARGB8888(x, y);
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break;
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case SDL_BLENDMODE_MOD:
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DRAW_SETPIXELXY_MOD_ARGB8888(x, y);
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break;
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default:
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DRAW_SETPIXELXY_ARGB8888(x, y);
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break;
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}
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return 0;
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}
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static int
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SDL_BlendPoint_RGB(SDL_Surface * dst, int x, int y, int blendMode, Uint8 r,
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Uint8 g, Uint8 b, Uint8 a)
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{
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SDL_PixelFormat *fmt = dst->format;
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unsigned inva = 0xff - a;
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switch (fmt->BytesPerPixel) {
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case 2:
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switch (blendMode) {
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case SDL_BLENDMODE_BLEND:
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DRAW_SETPIXELXY2_BLEND_RGB(x, y);
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break;
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case SDL_BLENDMODE_ADD:
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DRAW_SETPIXELXY2_ADD_RGB(x, y);
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break;
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case SDL_BLENDMODE_MOD:
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DRAW_SETPIXELXY2_MOD_RGB(x, y);
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break;
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default:
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DRAW_SETPIXELXY2_RGB(x, y);
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break;
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}
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return 0;
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case 4:
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switch (blendMode) {
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case SDL_BLENDMODE_BLEND:
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DRAW_SETPIXELXY4_BLEND_RGB(x, y);
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break;
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case SDL_BLENDMODE_ADD:
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DRAW_SETPIXELXY4_ADD_RGB(x, y);
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break;
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case SDL_BLENDMODE_MOD:
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DRAW_SETPIXELXY4_MOD_RGB(x, y);
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break;
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default:
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DRAW_SETPIXELXY4_RGB(x, y);
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break;
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}
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return 0;
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default:
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SDL_Unsupported();
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return -1;
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}
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}
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static int
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SDL_BlendPoint_RGBA(SDL_Surface * dst, int x, int y, int blendMode, Uint8 r,
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Uint8 g, Uint8 b, Uint8 a)
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{
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SDL_PixelFormat *fmt = dst->format;
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unsigned inva = 0xff - a;
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switch (fmt->BytesPerPixel) {
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case 4:
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switch (blendMode) {
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case SDL_BLENDMODE_BLEND:
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DRAW_SETPIXELXY4_BLEND_RGBA(x, y);
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break;
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case SDL_BLENDMODE_ADD:
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DRAW_SETPIXELXY4_ADD_RGBA(x, y);
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break;
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case SDL_BLENDMODE_MOD:
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DRAW_SETPIXELXY4_MOD_RGBA(x, y);
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break;
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default:
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DRAW_SETPIXELXY4_RGBA(x, y);
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break;
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}
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return 0;
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default:
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SDL_Unsupported();
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return -1;
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}
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}
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int
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SDL_BlendPoint(SDL_Surface * dst, int x, int y, int blendMode, Uint8 r,
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Uint8 g, Uint8 b, Uint8 a)
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{
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SDL_PixelFormat *fmt = dst->format;
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/* This function doesn't work on surfaces < 8 bpp */
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if (dst->format->BitsPerPixel < 8) {
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SDL_SetError("SDL_BlendPoint(): Unsupported surface format");
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return (-1);
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}
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/* Perform clipping */
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if (x < dst->clip_rect.x || y < dst->clip_rect.y ||
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x >= (dst->clip_rect.x + dst->clip_rect.w) ||
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y >= (dst->clip_rect.y + dst->clip_rect.h)) {
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return 0;
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}
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if ((blendMode == SDL_BLENDMODE_BLEND)
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|| (blendMode == SDL_BLENDMODE_ADD)) {
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r = DRAW_MUL(r, a);
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g = DRAW_MUL(g, a);
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b = DRAW_MUL(b, a);
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}
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switch (fmt->BitsPerPixel) {
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case 15:
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switch (fmt->Rmask) {
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case 0x7C00:
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return SDL_BlendPoint_RGB555(dst, x, y, blendMode, r, g, b, a);
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}
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break;
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case 16:
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switch (fmt->Rmask) {
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case 0xF800:
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return SDL_BlendPoint_RGB565(dst, x, y, blendMode, r, g, b, a);
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}
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break;
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case 32:
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switch (fmt->Rmask) {
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case 0x00FF0000:
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if (!fmt->Amask) {
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return SDL_BlendPoint_RGB888(dst, x, y, blendMode, r, g, b,
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a);
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} else {
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return SDL_BlendPoint_ARGB8888(dst, x, y, blendMode, r, g, b,
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a);
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}
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break;
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}
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default:
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break;
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}
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if (!fmt->Amask) {
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return SDL_BlendPoint_RGB(dst, x, y, blendMode, r, g, b, a);
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} else {
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return SDL_BlendPoint_RGBA(dst, x, y, blendMode, r, g, b, a);
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}
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}
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/* vi: set ts=4 sw=4 expandtab: */
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