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annotate src/video/SDL_blendline.c @ 3594:c8bed77b0386

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Added SDL_DrawRect(), SDL_DrawRects(), SDL_BlendRect() and SDL_BlendRects() Fixed line drawing so when blending a sequence of lines there are no overlapping pixels drawn.
author Sam Lantinga <slouken@libsdl.org>
date Fri, 18 Dec 2009 07:41:59 +0000
parents 0267b8b1595c
children f638ded38b8a
rev   line source
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32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 Sam Lantinga
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4
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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5 This library is free software; you can redistribute it and/or
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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6 modify it under the terms of the GNU Lesser General Public
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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7 License as published by the Free Software Foundation; either
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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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
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9
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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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
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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13 Lesser General Public License for more details.
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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14
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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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
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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
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 #include "SDL_draw.h"
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25
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26 static int
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27 SDL_BlendLine_RGB555(SDL_Surface * dst, int x1, int y1, int x2, int y2,
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28 int blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a,
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29 SDL_bool draw_end)
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30 {
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31 unsigned inva = 0xff - a;
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32
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33 switch (blendMode) {
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34 case SDL_BLENDMODE_BLEND:
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35 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY_BLEND_RGB555, draw_end);
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36 break;
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37 case SDL_BLENDMODE_ADD:
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38 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY_ADD_RGB555, draw_end);
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39 break;
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40 case SDL_BLENDMODE_MOD:
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41 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY_MOD_RGB555, draw_end);
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42 break;
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43 default:
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44 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY_RGB555, draw_end);
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45 break;
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46 }
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47 return 0;
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48 }
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49
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50 static int
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51 SDL_BlendLine_RGB565(SDL_Surface * dst, int x1, int y1, int x2, int y2,
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52 int blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a,
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53 SDL_bool draw_end)
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54 {
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55 unsigned inva = 0xff - a;
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56
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57 switch (blendMode) {
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58 case SDL_BLENDMODE_BLEND:
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59 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY_BLEND_RGB565, draw_end);
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60 break;
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61 case SDL_BLENDMODE_ADD:
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62 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY_ADD_RGB565, draw_end);
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63 break;
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64 case SDL_BLENDMODE_MOD:
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65 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY_MOD_RGB565, draw_end);
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66 break;
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67 default:
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68 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY_RGB565, draw_end);
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69 break;
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70 }
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71 return 0;
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72 }
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73
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74 static int
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75 SDL_BlendLine_RGB888(SDL_Surface * dst, int x1, int y1, int x2, int y2,
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76 int blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a,
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77 SDL_bool draw_end)
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78 {
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79 unsigned inva = 0xff - a;
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80
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81 switch (blendMode) {
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82 case SDL_BLENDMODE_BLEND:
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83 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY_BLEND_RGB888, draw_end);
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84 break;
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85 case SDL_BLENDMODE_ADD:
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86 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY_ADD_RGB888, draw_end);
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87 break;
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88 case SDL_BLENDMODE_MOD:
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89 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY_MOD_RGB888, draw_end);
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90 break;
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91 default:
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92 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY_RGB888, draw_end);
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93 break;
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94 }
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95 return 0;
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96 }
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97
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98 static int
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99 SDL_BlendLine_ARGB8888(SDL_Surface * dst, int x1, int y1, int x2, int y2,
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100 int blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a,
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101 SDL_bool draw_end)
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102 {
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103 unsigned inva = 0xff - a;
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104
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105 switch (blendMode) {
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106 case SDL_BLENDMODE_BLEND:
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107 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY_BLEND_ARGB8888, draw_end);
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108 break;
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109 case SDL_BLENDMODE_ADD:
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110 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY_ADD_ARGB8888, draw_end);
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111 break;
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112 case SDL_BLENDMODE_MOD:
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113 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY_MOD_ARGB8888, draw_end);
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114 break;
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115 default:
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116 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY_ARGB8888, draw_end);
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117 break;
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118 }
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119 return 0;
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120 }
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121
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122 static int
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123 SDL_BlendLine_RGB(SDL_Surface * dst, int x1, int y1, int x2, int y2,
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124 int blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a,
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125 SDL_bool draw_end)
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126 {
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diff changeset
127 SDL_PixelFormat *fmt = dst->format;
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Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
128 unsigned inva = 0xff - a;
2896
1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 2888
diff changeset
129
2898
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parents: 2896
diff changeset
130 switch (fmt->BytesPerPixel) {
e40448bc7727 Share code between fill and line drawing
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parents: 2896
diff changeset
131 case 2:
e40448bc7727 Share code between fill and line drawing
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parents: 2896
diff changeset
132 switch (blendMode) {
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
133 case SDL_BLENDMODE_BLEND:
3594
c8bed77b0386 Added SDL_DrawRect(), SDL_DrawRects(), SDL_BlendRect() and SDL_BlendRects()
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
134 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY2_BLEND_RGB, draw_end);
2898
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
135 break;
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
136 case SDL_BLENDMODE_ADD:
3594
c8bed77b0386 Added SDL_DrawRect(), SDL_DrawRects(), SDL_BlendRect() and SDL_BlendRects()
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
137 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY2_ADD_RGB, draw_end);
2898
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
138 break;
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
139 case SDL_BLENDMODE_MOD:
3594
c8bed77b0386 Added SDL_DrawRect(), SDL_DrawRects(), SDL_BlendRect() and SDL_BlendRects()
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
140 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY2_MOD_RGB, draw_end);
2898
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
141 break;
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
142 default:
3594
c8bed77b0386 Added SDL_DrawRect(), SDL_DrawRects(), SDL_BlendRect() and SDL_BlendRects()
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
143 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY2_RGB, draw_end);
2898
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
144 break;
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
145 }
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
146 return 0;
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
147 case 4:
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
148 switch (blendMode) {
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
149 case SDL_BLENDMODE_BLEND:
3594
c8bed77b0386 Added SDL_DrawRect(), SDL_DrawRects(), SDL_BlendRect() and SDL_BlendRects()
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
150 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY4_BLEND_RGB, draw_end);
2898
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
151 break;
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
152 case SDL_BLENDMODE_ADD:
3594
c8bed77b0386 Added SDL_DrawRect(), SDL_DrawRects(), SDL_BlendRect() and SDL_BlendRects()
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
153 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY4_ADD_RGB, draw_end);
2898
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
154 break;
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
155 case SDL_BLENDMODE_MOD:
3594
c8bed77b0386 Added SDL_DrawRect(), SDL_DrawRects(), SDL_BlendRect() and SDL_BlendRects()
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
156 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY4_MOD_RGB, draw_end);
2898
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
157 break;
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
158 default:
3594
c8bed77b0386 Added SDL_DrawRect(), SDL_DrawRects(), SDL_BlendRect() and SDL_BlendRects()
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
159 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY4_RGB, draw_end);
2898
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
160 break;
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 return 0;
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
163 default:
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
164 SDL_Unsupported();
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
165 return -1;
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
166 }
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
167 }
2896
1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 2888
diff changeset
168
2898
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
169 static int
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Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
170 SDL_BlendLine_RGBA(SDL_Surface * dst, int x1, int y1, int x2, int y2,
3594
c8bed77b0386 Added SDL_DrawRect(), SDL_DrawRects(), SDL_BlendRect() and SDL_BlendRects()
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
171 int blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a,
c8bed77b0386 Added SDL_DrawRect(), SDL_DrawRects(), SDL_BlendRect() and SDL_BlendRects()
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
172 SDL_bool draw_end)
2898
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
173 {
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
174 SDL_PixelFormat *fmt = dst->format;
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
175 unsigned inva = 0xff - a;
2896
1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 2888
diff changeset
176
2898
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
177 switch (fmt->BytesPerPixel) {
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
178 case 4:
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
179 switch (blendMode) {
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
180 case SDL_BLENDMODE_BLEND:
3594
c8bed77b0386 Added SDL_DrawRect(), SDL_DrawRects(), SDL_BlendRect() and SDL_BlendRects()
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
181 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY4_BLEND_RGBA, draw_end);
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 case SDL_BLENDMODE_ADD:
3594
c8bed77b0386 Added SDL_DrawRect(), SDL_DrawRects(), SDL_BlendRect() and SDL_BlendRects()
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
184 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY4_ADD_RGBA, draw_end);
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 case SDL_BLENDMODE_MOD:
3594
c8bed77b0386 Added SDL_DrawRect(), SDL_DrawRects(), SDL_BlendRect() and SDL_BlendRects()
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
187 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY4_MOD_RGBA, draw_end);
2898
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
188 break;
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
189 default:
3594
c8bed77b0386 Added SDL_DrawRect(), SDL_DrawRects(), SDL_BlendRect() and SDL_BlendRects()
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
190 DRAWLINE(x1, y1, x2, y2, DRAW_SETPIXELXY4_RGBA, draw_end);
2898
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
191 break;
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
192 }
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
193 return 0;
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
194 default:
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
195 SDL_Unsupported();
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
196 return -1;
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
197 }
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
198 }
2888
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
199
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
200 int
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
201 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
202 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
203 {
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
204 /* 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
205 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
206 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
207 return (-1);
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
208 }
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
209
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
210 /* Perform clipping */
2910
27d8b12e0e8e Fixed argument order to the line clipping routine
Sam Lantinga <slouken@libsdl.org>
parents: 2909
diff changeset
211 if (!SDL_IntersectRectAndLine(&dst->clip_rect, &x1, &y1, &x2, &y2)) {
2909
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2900
diff changeset
212 return (0);
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2900
diff changeset
213 }
3da0bb421d83 Added line clipping
Sam Lantinga <slouken@libsdl.org>
parents: 2900
diff changeset
214
2888
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
215
3536
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 2910
diff changeset
216 if (blendMode == SDL_BLENDMODE_BLEND || blendMode == SDL_BLENDMODE_ADD) {
2898
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
217 r = DRAW_MUL(r, a);
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
218 g = DRAW_MUL(g, a);
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
219 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
220 }
2898
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
221
3536
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 2910
diff changeset
222 switch (dst->format->BitsPerPixel) {
2896
1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 2888
diff changeset
223 case 15:
3536
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 2910
diff changeset
224 switch (dst->format->Rmask) {
2898
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
225 case 0x7C00:
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
226 return SDL_BlendLine_RGB555(dst, x1, y1, x2, y2, blendMode, r, g,
3594
c8bed77b0386 Added SDL_DrawRect(), SDL_DrawRects(), SDL_BlendRect() and SDL_BlendRects()
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
227 b, a, SDL_TRUE);
2896
1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 2888
diff changeset
228 }
1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 2888
diff changeset
229 break;
1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 2888
diff changeset
230 case 16:
3536
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 2910
diff changeset
231 switch (dst->format->Rmask) {
2898
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
232 case 0xF800:
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
233 return SDL_BlendLine_RGB565(dst, x1, y1, x2, y2, blendMode, r, g,
3594
c8bed77b0386 Added SDL_DrawRect(), SDL_DrawRects(), SDL_BlendRect() and SDL_BlendRects()
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
234 b, a, SDL_TRUE);
2896
1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 2888
diff changeset
235 }
1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 2888
diff changeset
236 break;
1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 2888
diff changeset
237 case 32:
3536
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 2910
diff changeset
238 switch (dst->format->Rmask) {
2898
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
239 case 0x00FF0000:
3536
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 2910
diff changeset
240 if (!dst->format->Amask) {
2898
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
241 return SDL_BlendLine_RGB888(dst, x1, y1, x2, y2, blendMode, r,
3594
c8bed77b0386 Added SDL_DrawRect(), SDL_DrawRects(), SDL_BlendRect() and SDL_BlendRects()
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
242 g, b, a, SDL_TRUE);
2899
a0c837a16e4c Added ARGB optimized case for Mac OS X
Sam Lantinga <slouken@libsdl.org>
parents: 2898
diff changeset
243 } else {
a0c837a16e4c Added ARGB optimized case for Mac OS X
Sam Lantinga <slouken@libsdl.org>
parents: 2898
diff changeset
244 return SDL_BlendLine_ARGB8888(dst, x1, y1, x2, y2, blendMode,
3594
c8bed77b0386 Added SDL_DrawRect(), SDL_DrawRects(), SDL_BlendRect() and SDL_BlendRects()
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
245 r, g, b, a, SDL_TRUE);
2898
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
246 }
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 }
3536
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 2910
diff changeset
249 break;
2898
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
250 default:
2896
1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 2888
diff changeset
251 break;
1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 2888
diff changeset
252 }
2898
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
253
3536
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 2910
diff changeset
254 if (!dst->format->Amask) {
3594
c8bed77b0386 Added SDL_DrawRect(), SDL_DrawRects(), SDL_BlendRect() and SDL_BlendRects()
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
255 return SDL_BlendLine_RGB(dst, x1, y1, x2, y2, blendMode,
c8bed77b0386 Added SDL_DrawRect(), SDL_DrawRects(), SDL_BlendRect() and SDL_BlendRects()
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
256 r, g, b, a, SDL_TRUE);
2898
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
257 } else {
3594
c8bed77b0386 Added SDL_DrawRect(), SDL_DrawRects(), SDL_BlendRect() and SDL_BlendRects()
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
258 return SDL_BlendLine_RGBA(dst, x1, y1, x2, y2, blendMode,
c8bed77b0386 Added SDL_DrawRect(), SDL_DrawRects(), SDL_BlendRect() and SDL_BlendRects()
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diff changeset
259 r, g, b, a, SDL_TRUE);
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260 }
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261 }
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262
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263 int
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264 SDL_BlendLines(SDL_Surface * dst, const SDL_Point * points, int count,
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265 int blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
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266 {
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
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267 int i;
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268 int x1, y1;
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269 int x2, y2;
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270 int (*func)(SDL_Surface * dst, int x1, int y1, int x2, int y2,
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271 int blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a,
c8bed77b0386 Added SDL_DrawRect(), SDL_DrawRects(), SDL_BlendRect() and SDL_BlendRects()
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272 SDL_bool draw_end) = NULL;
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273 int status = 0;
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274
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
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275 if (!dst) {
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276 SDL_SetError("Passed NULL destination surface");
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277 return -1;
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278 }
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279
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280 /* This function doesn't work on surfaces < 8 bpp */
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281 if (dst->format->BitsPerPixel < 8) {
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282 SDL_SetError("SDL_BlendLines(): Unsupported surface format");
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283 return -1;
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284 }
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285
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
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286 if (blendMode == SDL_BLENDMODE_BLEND || blendMode == SDL_BLENDMODE_ADD) {
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287 r = DRAW_MUL(r, a);
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288 g = DRAW_MUL(g, a);
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289 b = DRAW_MUL(b, a);
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290 }
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291
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292 /* FIXME: Does this function pointer slow things down significantly? */
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293 switch (dst->format->BitsPerPixel) {
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294 case 15:
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295 switch (dst->format->Rmask) {
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296 case 0x7C00:
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297 func = SDL_BlendLine_RGB555;
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298 }
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299 break;
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300 case 16:
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301 switch (dst->format->Rmask) {
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302 case 0xF800:
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303 func = SDL_BlendLine_RGB565;
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304 }
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305 break;
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306 case 32:
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307 switch (dst->format->Rmask) {
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308 case 0x00FF0000:
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309 if (!dst->format->Amask) {
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310 func = SDL_BlendLine_RGB888;
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311 } else {
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312 func = SDL_BlendLine_ARGB8888;
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313 }
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
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314 break;
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315 }
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diff changeset
316 default:
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317 break;
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318 }
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319
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320 if (!func) {
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321 if (!dst->format->Amask) {
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322 func = SDL_BlendLine_RGB;
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323 } else {
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324 func = SDL_BlendLine_RGBA;
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325 }
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
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326 }
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
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diff changeset
327
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
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diff changeset
328 for (i = 1; i < count; ++i) {
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329 x1 = points[i-1].x;
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330 y1 = points[i-1].y;
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331 x2 = points[i].x;
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332 y2 = points[i].y;
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diff changeset
333
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
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diff changeset
334 /* Perform clipping */
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335 /* FIXME: We don't actually want to clip, as it may change line slope */
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diff changeset
336 if (!SDL_IntersectRectAndLine(&dst->clip_rect, &x1, &y1, &x2, &y2)) {
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diff changeset
337 continue;
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diff changeset
338 }
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
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diff changeset
339
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c8bed77b0386 Added SDL_DrawRect(), SDL_DrawRects(), SDL_BlendRect() and SDL_BlendRects()
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diff changeset
340 status = func(dst, x1, y1, x2, y2, blendMode, r, g, b, a, SDL_FALSE);
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diff changeset
341 }
c8bed77b0386 Added SDL_DrawRect(), SDL_DrawRects(), SDL_BlendRect() and SDL_BlendRects()
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diff changeset
342 if (points[0].x != points[count-1].x || points[0].y != points[count-1].y) {
c8bed77b0386 Added SDL_DrawRect(), SDL_DrawRects(), SDL_BlendRect() and SDL_BlendRects()
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diff changeset
343 SDL_BlendPoint(dst, points[count-1].x, points[count-1].y, r, g, b, a);
3536
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diff changeset
344 }
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
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diff changeset
345 return status;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
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diff changeset
346 }
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
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diff changeset
347
2888
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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parents:
diff changeset
348 /* vi: set ts=4 sw=4 expandtab: */