sdl-ios-xcode: src/video/SDL_blendline.c annotate

annotate src/video/SDL_blendline.c @ 3473:7bdc10624cba

This is terrible, but the OpenGL standard says that lines are half open, which means that one endpoint is not covered so adjoining lines don't overlap. It also doesn't define which end is open, and indeed Mac OS X and Linux differ. Mac OS X seems to leave the second endpoint open, but Linux uses the right-most endpoint for x major lines and the bottom-most endpoint for y major lines.

author	Sam Lantinga <slouken@libsdl.org>
date	Sat, 21 Nov 2009 07:14:21 +0000
parents	27d8b12e0e8e
children	0267b8b1595c

rev	line source
2888 32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing Sam Lantinga <slouken@libsdl.org> parents: diff changeset	1 /*
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing Sam Lantinga <slouken@libsdl.org> parents: diff changeset	2 SDL - Simple DirectMedia Layer
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing Sam Lantinga <slouken@libsdl.org> parents: diff changeset	3 Copyright (C) 1997-2009 Sam Lantinga
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing Sam Lantinga <slouken@libsdl.org> parents: diff changeset	4
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing Sam Lantinga <slouken@libsdl.org> parents: diff changeset	5 This library is free software; you can redistribute it and/or
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing Sam Lantinga <slouken@libsdl.org> parents: diff changeset	6 modify it under the terms of the GNU Lesser General Public
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing Sam Lantinga <slouken@libsdl.org> parents: diff changeset	7 License as published by the Free Software Foundation; either
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing Sam Lantinga <slouken@libsdl.org> parents: diff changeset	8 version 2.1 of the License, or (at your option) any later version.
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing Sam Lantinga <slouken@libsdl.org> parents: diff changeset	9
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing Sam Lantinga <slouken@libsdl.org> parents: diff changeset	10 This library is distributed in the hope that it will be useful,
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing Sam Lantinga <slouken@libsdl.org> parents: diff changeset	11 but WITHOUT ANY WARRANTY; without even the implied warranty of
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing Sam Lantinga <slouken@libsdl.org> parents: diff changeset	12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing Sam Lantinga <slouken@libsdl.org> parents: diff changeset	13 Lesser General Public License for more details.
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing Sam Lantinga <slouken@libsdl.org> parents: diff changeset	14
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing Sam Lantinga <slouken@libsdl.org> parents: diff changeset	15 You should have received a copy of the GNU Lesser General Public
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing Sam Lantinga <slouken@libsdl.org> parents: diff changeset	16 License along with this library; if not, write to the Free Software
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing Sam Lantinga <slouken@libsdl.org> parents: diff changeset	17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing Sam Lantinga <slouken@libsdl.org> parents: diff changeset	18
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing Sam Lantinga <slouken@libsdl.org> parents: diff changeset	19 Sam Lantinga
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing Sam Lantinga <slouken@libsdl.org> parents: diff changeset	20 slouken@libsdl.org
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing Sam Lantinga <slouken@libsdl.org> parents: diff changeset	21 */
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing Sam Lantinga <slouken@libsdl.org> parents: diff changeset	22 #include "SDL_config.h"
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing Sam Lantinga <slouken@libsdl.org> parents: diff changeset	23
2898 e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	24 #include "SDL_draw.h"
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	25
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	26 static int
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	27 SDL_BlendLine_RGB555(SDL_Surface * dst, int x1, int y1, int x2, int y2,
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	28 int blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	29 {
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	30 unsigned inva = 0xff - a;
2888 32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing Sam Lantinga <slouken@libsdl.org> parents: diff changeset	31
2898 e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	32 switch (blendMode) {
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	33 case SDL_BLENDMODE_BLEND:
2900 3a9636c83849 Make it possible to switch algorithms in the future Sam Lantinga <slouken@libsdl.org> parents: 2899 diff changeset	34 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY_BLEND_RGB555);
2898 e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	35 break;
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	36 case SDL_BLENDMODE_ADD:
2900 3a9636c83849 Make it possible to switch algorithms in the future Sam Lantinga <slouken@libsdl.org> parents: 2899 diff changeset	37 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY_ADD_RGB555);
2898 e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	38 break;
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	39 case SDL_BLENDMODE_MOD:
2900 3a9636c83849 Make it possible to switch algorithms in the future Sam Lantinga <slouken@libsdl.org> parents: 2899 diff changeset	40 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY_MOD_RGB555);
2898 e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	41 break;
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	42 default:
2900 3a9636c83849 Make it possible to switch algorithms in the future Sam Lantinga <slouken@libsdl.org> parents: 2899 diff changeset	43 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY_RGB555);
2898 e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	44 break;
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	45 }
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	46 return 0;
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	47 }
2896 1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100 Sam Lantinga <slouken@libsdl.org> parents: 2888 diff changeset	48
2898 e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	49 static int
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	50 SDL_BlendLine_RGB565(SDL_Surface * dst, int x1, int y1, int x2, int y2,
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	51 int blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	52 {
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	53 unsigned inva = 0xff - a;
2896 1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100 Sam Lantinga <slouken@libsdl.org> parents: 2888 diff changeset	54
2898 e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	55 switch (blendMode) {
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	56 case SDL_BLENDMODE_BLEND:
2900 3a9636c83849 Make it possible to switch algorithms in the future Sam Lantinga <slouken@libsdl.org> parents: 2899 diff changeset	57 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY_BLEND_RGB565);
2898 e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	58 break;
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	59 case SDL_BLENDMODE_ADD:
2900 3a9636c83849 Make it possible to switch algorithms in the future Sam Lantinga <slouken@libsdl.org> parents: 2899 diff changeset	60 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY_ADD_RGB565);
2898 e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	61 break;
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	62 case SDL_BLENDMODE_MOD:
2900 3a9636c83849 Make it possible to switch algorithms in the future Sam Lantinga <slouken@libsdl.org> parents: 2899 diff changeset	63 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY_MOD_RGB565);
2898 e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	64 break;
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	65 default:
2900 3a9636c83849 Make it possible to switch algorithms in the future Sam Lantinga <slouken@libsdl.org> parents: 2899 diff changeset	66 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY_RGB565);
2898 e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	67 break;
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	68 }
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	69 return 0;
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	70 }
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	71
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	72 static int
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	73 SDL_BlendLine_RGB888(SDL_Surface * dst, int x1, int y1, int x2, int y2,
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	74 int blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	75 {
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	76 unsigned inva = 0xff - a;
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	77
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	78 switch (blendMode) {
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	79 case SDL_BLENDMODE_BLEND:
2900 3a9636c83849 Make it possible to switch algorithms in the future Sam Lantinga <slouken@libsdl.org> parents: 2899 diff changeset	80 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY_BLEND_RGB888);
2898 e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	81 break;
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	82 case SDL_BLENDMODE_ADD:
2900 3a9636c83849 Make it possible to switch algorithms in the future Sam Lantinga <slouken@libsdl.org> parents: 2899 diff changeset	83 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY_ADD_RGB888);
2898 e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	84 break;
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	85 case SDL_BLENDMODE_MOD:
2900 3a9636c83849 Make it possible to switch algorithms in the future Sam Lantinga <slouken@libsdl.org> parents: 2899 diff changeset	86 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY_MOD_RGB888);
2898 e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	87 break;
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	88 default:
2900 3a9636c83849 Make it possible to switch algorithms in the future Sam Lantinga <slouken@libsdl.org> parents: 2899 diff changeset	89 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY_RGB888);
2898 e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	90 break;
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	91 }
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	92 return 0;
2896 1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100 Sam Lantinga <slouken@libsdl.org> parents: 2888 diff changeset	93 }
1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100 Sam Lantinga <slouken@libsdl.org> parents: 2888 diff changeset	94
2898 e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	95 static int
2899 a0c837a16e4c Added ARGB optimized case for Mac OS X Sam Lantinga <slouken@libsdl.org> parents: 2898 diff changeset	96 SDL_BlendLine_ARGB8888(SDL_Surface * dst, int x1, int y1, int x2, int y2,
a0c837a16e4c Added ARGB optimized case for Mac OS X Sam Lantinga <slouken@libsdl.org> parents: 2898 diff changeset	97 int blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
a0c837a16e4c Added ARGB optimized case for Mac OS X Sam Lantinga <slouken@libsdl.org> parents: 2898 diff changeset	98 {
a0c837a16e4c Added ARGB optimized case for Mac OS X Sam Lantinga <slouken@libsdl.org> parents: 2898 diff changeset	99 unsigned inva = 0xff - a;
a0c837a16e4c Added ARGB optimized case for Mac OS X Sam Lantinga <slouken@libsdl.org> parents: 2898 diff changeset	100
a0c837a16e4c Added ARGB optimized case for Mac OS X Sam Lantinga <slouken@libsdl.org> parents: 2898 diff changeset	101 switch (blendMode) {
a0c837a16e4c Added ARGB optimized case for Mac OS X Sam Lantinga <slouken@libsdl.org> parents: 2898 diff changeset	102 case SDL_BLENDMODE_BLEND:
2900 3a9636c83849 Make it possible to switch algorithms in the future Sam Lantinga <slouken@libsdl.org> parents: 2899 diff changeset	103 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY_BLEND_ARGB8888);
2899 a0c837a16e4c Added ARGB optimized case for Mac OS X Sam Lantinga <slouken@libsdl.org> parents: 2898 diff changeset	104 break;
a0c837a16e4c Added ARGB optimized case for Mac OS X Sam Lantinga <slouken@libsdl.org> parents: 2898 diff changeset	105 case SDL_BLENDMODE_ADD:
2900 3a9636c83849 Make it possible to switch algorithms in the future Sam Lantinga <slouken@libsdl.org> parents: 2899 diff changeset	106 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY_ADD_ARGB8888);
2899 a0c837a16e4c Added ARGB optimized case for Mac OS X Sam Lantinga <slouken@libsdl.org> parents: 2898 diff changeset	107 break;
a0c837a16e4c Added ARGB optimized case for Mac OS X Sam Lantinga <slouken@libsdl.org> parents: 2898 diff changeset	108 case SDL_BLENDMODE_MOD:
2900 3a9636c83849 Make it possible to switch algorithms in the future Sam Lantinga <slouken@libsdl.org> parents: 2899 diff changeset	109 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY_MOD_ARGB8888);
2899 a0c837a16e4c Added ARGB optimized case for Mac OS X Sam Lantinga <slouken@libsdl.org> parents: 2898 diff changeset	110 break;
a0c837a16e4c Added ARGB optimized case for Mac OS X Sam Lantinga <slouken@libsdl.org> parents: 2898 diff changeset	111 default:
2900 3a9636c83849 Make it possible to switch algorithms in the future Sam Lantinga <slouken@libsdl.org> parents: 2899 diff changeset	112 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY_ARGB8888);
2899 a0c837a16e4c Added ARGB optimized case for Mac OS X Sam Lantinga <slouken@libsdl.org> parents: 2898 diff changeset	113 break;
a0c837a16e4c Added ARGB optimized case for Mac OS X Sam Lantinga <slouken@libsdl.org> parents: 2898 diff changeset	114 }
a0c837a16e4c Added ARGB optimized case for Mac OS X Sam Lantinga <slouken@libsdl.org> parents: 2898 diff changeset	115 return 0;
a0c837a16e4c Added ARGB optimized case for Mac OS X Sam Lantinga <slouken@libsdl.org> parents: 2898 diff changeset	116 }
a0c837a16e4c Added ARGB optimized case for Mac OS X Sam Lantinga <slouken@libsdl.org> parents: 2898 diff changeset	117
a0c837a16e4c Added ARGB optimized case for Mac OS X Sam Lantinga <slouken@libsdl.org> parents: 2898 diff changeset	118 static int
2898 e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	119 SDL_BlendLine_RGB(SDL_Surface * dst, int x1, int y1, int x2, int y2,
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	120 int blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	121 {
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	122 SDL_PixelFormat *fmt = dst->format;
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	123 unsigned inva = 0xff - a;
2896 1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100 Sam Lantinga <slouken@libsdl.org> parents: 2888 diff changeset	124
2898 e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	125 switch (fmt->BytesPerPixel) {
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	126 case 2:
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	127 switch (blendMode) {
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	128 case SDL_BLENDMODE_BLEND:
2900 3a9636c83849 Make it possible to switch algorithms in the future Sam Lantinga <slouken@libsdl.org> parents: 2899 diff changeset	129 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY2_BLEND_RGB);
2898 e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	130 break;
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	131 case SDL_BLENDMODE_ADD:
2900 3a9636c83849 Make it possible to switch algorithms in the future Sam Lantinga <slouken@libsdl.org> parents: 2899 diff changeset	132 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY2_ADD_RGB);
2898 e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	133 break;
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	134 case SDL_BLENDMODE_MOD:
2900 3a9636c83849 Make it possible to switch algorithms in the future Sam Lantinga <slouken@libsdl.org> parents: 2899 diff changeset	135 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY2_MOD_RGB);
2898 e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	136 break;
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	137 default:
2900 3a9636c83849 Make it possible to switch algorithms in the future Sam Lantinga <slouken@libsdl.org> parents: 2899 diff changeset	138 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY2_RGB);
2898 e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	139 break;
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	140 }
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	141 return 0;
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	142 case 4:
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	143 switch (blendMode) {
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	144 case SDL_BLENDMODE_BLEND:
2900 3a9636c83849 Make it possible to switch algorithms in the future Sam Lantinga <slouken@libsdl.org> parents: 2899 diff changeset	145 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY4_BLEND_RGB);
2898 e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	146 break;
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	147 case SDL_BLENDMODE_ADD:
2900 3a9636c83849 Make it possible to switch algorithms in the future Sam Lantinga <slouken@libsdl.org> parents: 2899 diff changeset	148 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY4_ADD_RGB);
2898 e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	149 break;
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	150 case SDL_BLENDMODE_MOD:
2900 3a9636c83849 Make it possible to switch algorithms in the future Sam Lantinga <slouken@libsdl.org> parents: 2899 diff changeset	151 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY4_MOD_RGB);
2898 e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	152 break;
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	153 default:
2900 3a9636c83849 Make it possible to switch algorithms in the future Sam Lantinga <slouken@libsdl.org> parents: 2899 diff changeset	154 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY4_RGB);
2898 e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	155 break;
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	156 }
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	157 return 0;
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	158 default:
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	159 SDL_Unsupported();
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	160 return -1;
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	161 }
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	162 }
2896 1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100 Sam Lantinga <slouken@libsdl.org> parents: 2888 diff changeset	163
2898 e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	164 static int
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	165 SDL_BlendLine_RGBA(SDL_Surface * dst, int x1, int y1, int x2, int y2,
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	166 int blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	167 {
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	168 SDL_PixelFormat *fmt = dst->format;
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	169 unsigned inva = 0xff - a;
2896 1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100 Sam Lantinga <slouken@libsdl.org> parents: 2888 diff changeset	170
2898 e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	171 switch (fmt->BytesPerPixel) {
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	172 case 4:
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	173 switch (blendMode) {
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	174 case SDL_BLENDMODE_BLEND:
2900 3a9636c83849 Make it possible to switch algorithms in the future Sam Lantinga <slouken@libsdl.org> parents: 2899 diff changeset	175 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY4_BLEND_RGBA);
2898 e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	176 break;
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	177 case SDL_BLENDMODE_ADD:
2900 3a9636c83849 Make it possible to switch algorithms in the future Sam Lantinga <slouken@libsdl.org> parents: 2899 diff changeset	178 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY4_ADD_RGBA);
2898 e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	179 break;
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	180 case SDL_BLENDMODE_MOD:
2900 3a9636c83849 Make it possible to switch algorithms in the future Sam Lantinga <slouken@libsdl.org> parents: 2899 diff changeset	181 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY4_MOD_RGBA);
2898 e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	182 break;
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	183 default:
2900 3a9636c83849 Make it possible to switch algorithms in the future Sam Lantinga <slouken@libsdl.org> parents: 2899 diff changeset	184 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY4_RGBA);
2898 e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	185 break;
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	186 }
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	187 return 0;
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	188 default:
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	189 SDL_Unsupported();
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	190 return -1;
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	191 }
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	192 }
2888 32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing Sam Lantinga <slouken@libsdl.org> parents: diff changeset	193
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing Sam Lantinga <slouken@libsdl.org> parents: diff changeset	194 int
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing Sam Lantinga <slouken@libsdl.org> parents: diff changeset	195 SDL_BlendLine(SDL_Surface * dst, int x1, int y1, int x2, int y2,
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing Sam Lantinga <slouken@libsdl.org> parents: diff changeset	196 int blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing Sam Lantinga <slouken@libsdl.org> parents: diff changeset	197 {
2898 e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	198 SDL_PixelFormat *fmt = dst->format;
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	199
2888 32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing Sam Lantinga <slouken@libsdl.org> parents: diff changeset	200 /* This function doesn't work on surfaces < 8 bpp */
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing Sam Lantinga <slouken@libsdl.org> parents: diff changeset	201 if (dst->format->BitsPerPixel < 8) {
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing Sam Lantinga <slouken@libsdl.org> parents: diff changeset	202 SDL_SetError("SDL_BlendLine(): Unsupported surface format");
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing Sam Lantinga <slouken@libsdl.org> parents: diff changeset	203 return (-1);
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing Sam Lantinga <slouken@libsdl.org> parents: diff changeset	204 }
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing Sam Lantinga <slouken@libsdl.org> parents: diff changeset	205
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing Sam Lantinga <slouken@libsdl.org> parents: diff changeset	206 /* Perform clipping */
2910 27d8b12e0e8e Fixed argument order to the line clipping routine Sam Lantinga <slouken@libsdl.org> parents: 2909 diff changeset	207 if (!SDL_IntersectRectAndLine(&dst->clip_rect, &x1, &y1, &x2, &y2)) {
2909 3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2900 diff changeset	208 return (0);
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2900 diff changeset	209 }
3da0bb421d83 Added line clipping Sam Lantinga <slouken@libsdl.org> parents: 2900 diff changeset	210
2888 32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing Sam Lantinga <slouken@libsdl.org> parents: diff changeset	211
2896 1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100 Sam Lantinga <slouken@libsdl.org> parents: 2888 diff changeset	212 if ((blendMode == SDL_BLENDMODE_BLEND)
1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100 Sam Lantinga <slouken@libsdl.org> parents: 2888 diff changeset	213 \|\| (blendMode == SDL_BLENDMODE_ADD)) {
2898 e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	214 r = DRAW_MUL(r, a);
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	215 g = DRAW_MUL(g, a);
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	216 b = DRAW_MUL(b, a);
2896 1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100 Sam Lantinga <slouken@libsdl.org> parents: 2888 diff changeset	217 }
2898 e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	218
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	219 switch (fmt->BitsPerPixel) {
2896 1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100 Sam Lantinga <slouken@libsdl.org> parents: 2888 diff changeset	220 case 15:
2898 e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	221 switch (fmt->Rmask) {
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	222 case 0x7C00:
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	223 return SDL_BlendLine_RGB555(dst, x1, y1, x2, y2, blendMode, r, g,
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	224 b, a);
2896 1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100 Sam Lantinga <slouken@libsdl.org> parents: 2888 diff changeset	225 }
1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100 Sam Lantinga <slouken@libsdl.org> parents: 2888 diff changeset	226 break;
1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100 Sam Lantinga <slouken@libsdl.org> parents: 2888 diff changeset	227 case 16:
2898 e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	228 switch (fmt->Rmask) {
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	229 case 0xF800:
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	230 return SDL_BlendLine_RGB565(dst, x1, y1, x2, y2, blendMode, r, g,
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	231 b, a);
2896 1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100 Sam Lantinga <slouken@libsdl.org> parents: 2888 diff changeset	232 }
1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100 Sam Lantinga <slouken@libsdl.org> parents: 2888 diff changeset	233 break;
1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100 Sam Lantinga <slouken@libsdl.org> parents: 2888 diff changeset	234 case 32:
2898 e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	235 switch (fmt->Rmask) {
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	236 case 0x00FF0000:
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	237 if (!fmt->Amask) {
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	238 return SDL_BlendLine_RGB888(dst, x1, y1, x2, y2, blendMode, r,
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	239 g, b, a);
2899 a0c837a16e4c Added ARGB optimized case for Mac OS X Sam Lantinga <slouken@libsdl.org> parents: 2898 diff changeset	240 } else {
a0c837a16e4c Added ARGB optimized case for Mac OS X Sam Lantinga <slouken@libsdl.org> parents: 2898 diff changeset	241 return SDL_BlendLine_ARGB8888(dst, x1, y1, x2, y2, blendMode,
a0c837a16e4c Added ARGB optimized case for Mac OS X Sam Lantinga <slouken@libsdl.org> parents: 2898 diff changeset	242 r, g, b, a);
2898 e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	243 }
2896 1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100 Sam Lantinga <slouken@libsdl.org> parents: 2888 diff changeset	244 break;
1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100 Sam Lantinga <slouken@libsdl.org> parents: 2888 diff changeset	245 }
2898 e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	246 default:
2896 1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100 Sam Lantinga <slouken@libsdl.org> parents: 2888 diff changeset	247 break;
1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100 Sam Lantinga <slouken@libsdl.org> parents: 2888 diff changeset	248 }
2898 e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	249
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	250 if (!fmt->Amask) {
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	251 return SDL_BlendLine_RGB(dst, x1, y1, x2, y2, blendMode, r, g, b, a);
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	252 } else {
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	253 return SDL_BlendLine_RGBA(dst, x1, y1, x2, y2, blendMode, r, g, b, a);
e40448bc7727 Share code between fill and line drawing Sam Lantinga <slouken@libsdl.org> parents: 2896 diff changeset	254 }
2888 32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing Sam Lantinga <slouken@libsdl.org> parents: diff changeset	255 }
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing Sam Lantinga <slouken@libsdl.org> parents: diff changeset	256
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing Sam Lantinga <slouken@libsdl.org> parents: diff changeset	257 /* vi: set ts=4 sw=4 expandtab: */

Mercurial > sdl-ios-xcode

annotate src/video/SDL_blendline.c @ 3473:7bdc10624cba