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SDL_blendrect.c
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SDL_blendrect.c
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/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997-2009 Sam Lantinga
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Sam Lantinga
slouken@libsdl.org
*/
#include "SDL_config.h"
#include "SDL_video.h"
#include "SDL_draw.h"
static int
SDL_BlendRect_RGB555(SDL_Surface * dst, SDL_Rect * dstrect, int blendMode,
Uint8 r, Uint8 g, Uint8 b, Uint8 a)
{
unsigned inva = 0xff - a;
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
FILLRECT(Uint16, DRAW_SETPIXEL_BLEND_RGB555);
break;
case SDL_BLENDMODE_ADD:
FILLRECT(Uint16, DRAW_SETPIXEL_ADD_RGB555);
break;
case SDL_BLENDMODE_MOD:
FILLRECT(Uint16, DRAW_SETPIXEL_MOD_RGB555);
break;
default:
FILLRECT(Uint16, DRAW_SETPIXEL_RGB555);
break;
}
return 0;
}
static int
SDL_BlendRect_RGB565(SDL_Surface * dst, SDL_Rect * dstrect, int blendMode,
Uint8 r, Uint8 g, Uint8 b, Uint8 a)
{
unsigned inva = 0xff - a;
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
FILLRECT(Uint16, DRAW_SETPIXEL_BLEND_RGB565);
break;
case SDL_BLENDMODE_ADD:
FILLRECT(Uint16, DRAW_SETPIXEL_ADD_RGB565);
break;
case SDL_BLENDMODE_MOD:
FILLRECT(Uint16, DRAW_SETPIXEL_MOD_RGB565);
break;
default:
FILLRECT(Uint16, DRAW_SETPIXEL_RGB565);
break;
}
return 0;
}
static int
SDL_BlendRect_RGB888(SDL_Surface * dst, SDL_Rect * dstrect, int blendMode,
Uint8 r, Uint8 g, Uint8 b, Uint8 a)
{
unsigned inva = 0xff - a;
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
FILLRECT(Uint32, DRAW_SETPIXEL_BLEND_RGB888);
break;
case SDL_BLENDMODE_ADD:
FILLRECT(Uint32, DRAW_SETPIXEL_ADD_RGB888);
break;
case SDL_BLENDMODE_MOD:
FILLRECT(Uint32, DRAW_SETPIXEL_MOD_RGB888);
break;
default:
FILLRECT(Uint32, DRAW_SETPIXEL_RGB888);
break;
}
return 0;
}
static int
SDL_BlendRect_ARGB8888(SDL_Surface * dst, SDL_Rect * dstrect, int blendMode,
Uint8 r, Uint8 g, Uint8 b, Uint8 a)
{
unsigned inva = 0xff - a;
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
FILLRECT(Uint32, DRAW_SETPIXEL_BLEND_ARGB8888);
break;
case SDL_BLENDMODE_ADD:
FILLRECT(Uint32, DRAW_SETPIXEL_ADD_ARGB8888);
break;
case SDL_BLENDMODE_MOD:
FILLRECT(Uint32, DRAW_SETPIXEL_MOD_ARGB8888);
break;
default:
FILLRECT(Uint32, DRAW_SETPIXEL_ARGB8888);
break;
}
return 0;
}
static int
SDL_BlendRect_RGB(SDL_Surface * dst, SDL_Rect * dstrect, int blendMode,
Uint8 r, Uint8 g, Uint8 b, Uint8 a)
{
SDL_PixelFormat *fmt = dst->format;
unsigned inva = 0xff - a;
switch (fmt->BytesPerPixel) {
case 2:
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
FILLRECT(Uint16, DRAW_SETPIXEL_BLEND_RGB);
break;
case SDL_BLENDMODE_ADD:
FILLRECT(Uint16, DRAW_SETPIXEL_ADD_RGB);
break;
case SDL_BLENDMODE_MOD:
FILLRECT(Uint16, DRAW_SETPIXEL_MOD_RGB);
break;
default:
FILLRECT(Uint16, DRAW_SETPIXEL_RGB);
break;
}
return 0;
case 4:
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
FILLRECT(Uint32, DRAW_SETPIXEL_BLEND_RGB);
break;
case SDL_BLENDMODE_ADD:
FILLRECT(Uint32, DRAW_SETPIXEL_ADD_RGB);
break;
case SDL_BLENDMODE_MOD:
FILLRECT(Uint32, DRAW_SETPIXEL_MOD_RGB);
break;
default:
FILLRECT(Uint32, DRAW_SETPIXEL_RGB);
break;
}
return 0;
default:
SDL_Unsupported();
return -1;
}
}
static int
SDL_BlendRect_RGBA(SDL_Surface * dst, SDL_Rect * dstrect, int blendMode,
Uint8 r, Uint8 g, Uint8 b, Uint8 a)
{
SDL_PixelFormat *fmt = dst->format;
unsigned inva = 0xff - a;
switch (fmt->BytesPerPixel) {
case 4:
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
FILLRECT(Uint32, DRAW_SETPIXEL_BLEND_RGBA);
break;
case SDL_BLENDMODE_ADD:
FILLRECT(Uint32, DRAW_SETPIXEL_ADD_RGBA);
break;
case SDL_BLENDMODE_MOD:
FILLRECT(Uint32, DRAW_SETPIXEL_MOD_RGBA);
break;
default:
FILLRECT(Uint32, DRAW_SETPIXEL_RGBA);
break;
}
return 0;
default:
SDL_Unsupported();
return -1;
}
}
int
SDL_BlendRect(SDL_Surface * dst, SDL_Rect * dstrect, int blendMode, Uint8 r,
Uint8 g, Uint8 b, Uint8 a)
{
SDL_PixelFormat *fmt = dst->format;
/* This function doesn't work on surfaces < 8 bpp */
if (fmt->BitsPerPixel < 8) {
SDL_SetError("SDL_BlendRect(): Unsupported surface format");
return (-1);
}
/* If 'dstrect' == NULL, then fill the whole surface */
if (dstrect) {
/* Perform clipping */
if (!SDL_IntersectRect(dstrect, &dst->clip_rect, dstrect)) {
return (0);
}
} else {
dstrect = &dst->clip_rect;
}
if ((blendMode == SDL_BLENDMODE_BLEND)
|| (blendMode == SDL_BLENDMODE_ADD)) {
r = DRAW_MUL(r, a);
g = DRAW_MUL(g, a);
b = DRAW_MUL(b, a);
}
switch (fmt->BitsPerPixel) {
case 15:
switch (fmt->Rmask) {
case 0x7C00:
return SDL_BlendRect_RGB555(dst, dstrect, blendMode, r, g, b, a);
}
break;
case 16:
switch (fmt->Rmask) {
case 0xF800:
return SDL_BlendRect_RGB565(dst, dstrect, blendMode, r, g, b, a);
}
break;
case 32:
switch (fmt->Rmask) {
case 0x00FF0000:
if (!fmt->Amask) {
return SDL_BlendRect_RGB888(dst, dstrect, blendMode, r, g, b,
a);
} else {
return SDL_BlendRect_ARGB8888(dst, dstrect, blendMode, r, g,
b, a);
}
break;
}
default:
break;
}
if (!fmt->Amask) {
return SDL_BlendRect_RGB(dst, dstrect, blendMode, r, g, b, a);
} else {
return SDL_BlendRect_RGBA(dst, dstrect, blendMode, r, g, b, a);
}
}
/* vi: set ts=4 sw=4 expandtab: */