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annotate src/video/SDL_blendfillrect.c @ 4591:1e998db9b597

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Implement blending modes for textures. Fix off-screen pixmaps to be ARGB rather than RGB to enable blending across frames. Clear the screen and off-screen pixmaps when the renderer is created.
author Sunny Sachanandani <sunnysachanandani@gmail.com>
date Wed, 14 Jul 2010 19:17:11 +0530
parents f7b03b6838cb
children aa8888658021
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2010 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.
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9
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10 This library is distributed in the hope that it will be useful,
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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
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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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_video.h"
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25 #include "SDL_draw.h"
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26
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27 static int
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28 SDL_BlendFillRect_RGB555(SDL_Surface * dst, const SDL_Rect * rect,
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29 int blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
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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 FILLRECT(Uint16, DRAW_SETPIXEL_BLEND_RGB555);
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36 break;
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37 case SDL_BLENDMODE_ADD:
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38 FILLRECT(Uint16, DRAW_SETPIXEL_ADD_RGB555);
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39 break;
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40 case SDL_BLENDMODE_MOD:
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41 FILLRECT(Uint16, DRAW_SETPIXEL_MOD_RGB555);
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42 break;
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43 default:
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44 FILLRECT(Uint16, DRAW_SETPIXEL_RGB555);
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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_BlendFillRect_RGB565(SDL_Surface * dst, const SDL_Rect * rect,
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52 int blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
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53 {
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54 unsigned inva = 0xff - a;
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55
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56 switch (blendMode) {
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57 case SDL_BLENDMODE_BLEND:
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58 FILLRECT(Uint16, DRAW_SETPIXEL_BLEND_RGB565);
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59 break;
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60 case SDL_BLENDMODE_ADD:
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61 FILLRECT(Uint16, DRAW_SETPIXEL_ADD_RGB565);
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62 break;
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63 case SDL_BLENDMODE_MOD:
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64 FILLRECT(Uint16, DRAW_SETPIXEL_MOD_RGB565);
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65 break;
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66 default:
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67 FILLRECT(Uint16, DRAW_SETPIXEL_RGB565);
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68 break;
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69 }
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70 return 0;
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71 }
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72
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73 static int
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74 SDL_BlendFillRect_RGB888(SDL_Surface * dst, const SDL_Rect * rect,
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75 int blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
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76 {
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77 unsigned inva = 0xff - a;
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78
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79 switch (blendMode) {
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80 case SDL_BLENDMODE_BLEND:
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81 FILLRECT(Uint32, DRAW_SETPIXEL_BLEND_RGB888);
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82 break;
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83 case SDL_BLENDMODE_ADD:
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84 FILLRECT(Uint32, DRAW_SETPIXEL_ADD_RGB888);
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85 break;
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86 case SDL_BLENDMODE_MOD:
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87 FILLRECT(Uint32, DRAW_SETPIXEL_MOD_RGB888);
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88 break;
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89 default:
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90 FILLRECT(Uint32, DRAW_SETPIXEL_RGB888);
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91 break;
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92 }
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93 return 0;
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94 }
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95
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96 static int
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97 SDL_BlendFillRect_ARGB8888(SDL_Surface * dst, const SDL_Rect * rect,
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98 int blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
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99 {
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100 unsigned inva = 0xff - a;
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101
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102 switch (blendMode) {
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103 case SDL_BLENDMODE_BLEND:
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104 FILLRECT(Uint32, DRAW_SETPIXEL_BLEND_ARGB8888);
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105 break;
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106 case SDL_BLENDMODE_ADD:
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107 FILLRECT(Uint32, DRAW_SETPIXEL_ADD_ARGB8888);
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108 break;
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109 case SDL_BLENDMODE_MOD:
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110 FILLRECT(Uint32, DRAW_SETPIXEL_MOD_ARGB8888);
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111 break;
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112 default:
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113 FILLRECT(Uint32, DRAW_SETPIXEL_ARGB8888);
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114 break;
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115 }
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116 return 0;
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117 }
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118
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119 static int
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120 SDL_BlendFillRect_RGB(SDL_Surface * dst, const SDL_Rect * rect,
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121 int blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
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122 {
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123 SDL_PixelFormat *fmt = dst->format;
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124 unsigned inva = 0xff - a;
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125
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126 switch (fmt->BytesPerPixel) {
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127 case 2:
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128 switch (blendMode) {
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129 case SDL_BLENDMODE_BLEND:
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130 FILLRECT(Uint16, DRAW_SETPIXEL_BLEND_RGB);
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131 break;
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132 case SDL_BLENDMODE_ADD:
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133 FILLRECT(Uint16, DRAW_SETPIXEL_ADD_RGB);
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134 break;
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135 case SDL_BLENDMODE_MOD:
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136 FILLRECT(Uint16, DRAW_SETPIXEL_MOD_RGB);
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137 break;
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138 default:
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139 FILLRECT(Uint16, DRAW_SETPIXEL_RGB);
2898
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diff changeset
140 break;
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Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
141 }
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
142 return 0;
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Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
143 case 4:
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parents: 2896
diff changeset
144 switch (blendMode) {
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parents: 2896
diff changeset
145 case SDL_BLENDMODE_BLEND:
2900
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parents: 2899
diff changeset
146 FILLRECT(Uint32, DRAW_SETPIXEL_BLEND_RGB);
2898
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
147 break;
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
148 case SDL_BLENDMODE_ADD:
2900
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Sam Lantinga <slouken@libsdl.org>
parents: 2899
diff changeset
149 FILLRECT(Uint32, DRAW_SETPIXEL_ADD_RGB);
2898
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
150 break;
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
151 case SDL_BLENDMODE_MOD:
2900
3a9636c83849 Make it possible to switch algorithms in the future
Sam Lantinga <slouken@libsdl.org>
parents: 2899
diff changeset
152 FILLRECT(Uint32, DRAW_SETPIXEL_MOD_RGB);
2898
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
153 break;
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
154 default:
2900
3a9636c83849 Make it possible to switch algorithms in the future
Sam Lantinga <slouken@libsdl.org>
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diff changeset
155 FILLRECT(Uint32, DRAW_SETPIXEL_RGB);
2898
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
156 break;
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Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
157 }
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
158 return 0;
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Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
159 default:
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parents: 2896
diff changeset
160 SDL_Unsupported();
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
161 return -1;
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
162 }
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
163 }
2896
1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 2888
diff changeset
164
2898
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diff changeset
165 static int
3593
b931bcfd94a0 In the process of adding rectangle drawing
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diff changeset
166 SDL_BlendFillRect_RGBA(SDL_Surface * dst, const SDL_Rect * rect,
b931bcfd94a0 In the process of adding rectangle drawing
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
167 int blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
2898
e40448bc7727 Share code between fill and line drawing
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parents: 2896
diff changeset
168 {
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diff changeset
169 SDL_PixelFormat *fmt = dst->format;
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diff changeset
170 unsigned inva = 0xff - a;
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diff changeset
171
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
172 switch (fmt->BytesPerPixel) {
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Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
173 case 4:
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parents: 2896
diff changeset
174 switch (blendMode) {
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parents: 2896
diff changeset
175 case SDL_BLENDMODE_BLEND:
2900
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Sam Lantinga <slouken@libsdl.org>
parents: 2899
diff changeset
176 FILLRECT(Uint32, DRAW_SETPIXEL_BLEND_RGBA);
2898
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
177 break;
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
178 case SDL_BLENDMODE_ADD:
2900
3a9636c83849 Make it possible to switch algorithms in the future
Sam Lantinga <slouken@libsdl.org>
parents: 2899
diff changeset
179 FILLRECT(Uint32, DRAW_SETPIXEL_ADD_RGBA);
2898
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
180 break;
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
181 case SDL_BLENDMODE_MOD:
2900
3a9636c83849 Make it possible to switch algorithms in the future
Sam Lantinga <slouken@libsdl.org>
parents: 2899
diff changeset
182 FILLRECT(Uint32, DRAW_SETPIXEL_MOD_RGBA);
2898
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
183 break;
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Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
184 default:
2900
3a9636c83849 Make it possible to switch algorithms in the future
Sam Lantinga <slouken@libsdl.org>
parents: 2899
diff changeset
185 FILLRECT(Uint32, DRAW_SETPIXEL_RGBA);
2898
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
186 break;
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Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
187 }
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Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
188 return 0;
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
189 default:
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Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
190 SDL_Unsupported();
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
191 return -1;
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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 }
2888
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
194
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
195 int
3593
b931bcfd94a0 In the process of adding rectangle drawing
Sam Lantinga <slouken@libsdl.org>
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diff changeset
196 SDL_BlendFillRect(SDL_Surface * dst, const SDL_Rect * rect,
b931bcfd94a0 In the process of adding rectangle drawing
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
197 int blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
2888
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
198 {
3536
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
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diff changeset
199 SDL_Rect clipped;
2898
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
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diff changeset
200
3536
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 2900
diff changeset
201 if (!dst) {
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 2900
diff changeset
202 SDL_SetError("Passed NULL destination surface");
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 2900
diff changeset
203 return -1;
2888
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
3536
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 2900
diff changeset
206 /* This function doesn't work on surfaces < 8 bpp */
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 2900
diff changeset
207 if (dst->format->BitsPerPixel < 8) {
3593
b931bcfd94a0 In the process of adding rectangle drawing
Sam Lantinga <slouken@libsdl.org>
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diff changeset
208 SDL_SetError("SDL_BlendFillRect(): Unsupported surface format");
3536
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 2900
diff changeset
209 return -1;
2888
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
210 }
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
211
3536
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 2900
diff changeset
212 /* If 'rect' == NULL, then fill the whole surface */
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 2900
diff changeset
213 if (rect) {
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
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parents: 2900
diff changeset
214 /* Perform clipping */
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 2900
diff changeset
215 if (!SDL_IntersectRect(rect, &dst->clip_rect, &clipped)) {
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 2900
diff changeset
216 return 0;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 2900
diff changeset
217 }
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 2900
diff changeset
218 rect = &clipped;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 2900
diff changeset
219 } else {
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 2900
diff changeset
220 rect = &dst->clip_rect;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 2900
diff changeset
221 }
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 2900
diff changeset
222
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 2900
diff changeset
223 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
224 r = DRAW_MUL(r, a);
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
225 g = DRAW_MUL(g, a);
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
226 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
227 }
2898
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
228
3536
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 2900
diff changeset
229 switch (dst->format->BitsPerPixel) {
2896
1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 2888
diff changeset
230 case 15:
3536
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 2900
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 0x7C00:
3593
b931bcfd94a0 In the process of adding rectangle drawing
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
233 return SDL_BlendFillRect_RGB555(dst, rect, blendMode, r, g, b, a);
2896
1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 2888
diff changeset
234 }
1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 2888
diff changeset
235 break;
1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 2888
diff changeset
236 case 16:
3536
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 2900
diff changeset
237 switch (dst->format->Rmask) {
2898
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
238 case 0xF800:
3593
b931bcfd94a0 In the process of adding rectangle drawing
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
239 return SDL_BlendFillRect_RGB565(dst, rect, blendMode, r, g, b, a);
2896
1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 2888
diff changeset
240 }
1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 2888
diff changeset
241 break;
1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 2888
diff changeset
242 case 32:
3536
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 2900
diff changeset
243 switch (dst->format->Rmask) {
2898
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
244 case 0x00FF0000:
3536
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 2900
diff changeset
245 if (!dst->format->Amask) {
3593
b931bcfd94a0 In the process of adding rectangle drawing
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
246 return SDL_BlendFillRect_RGB888(dst, rect, blendMode, r, g, b, a);
2899
a0c837a16e4c Added ARGB optimized case for Mac OS X
Sam Lantinga <slouken@libsdl.org>
parents: 2898
diff changeset
247 } else {
3593
b931bcfd94a0 In the process of adding rectangle drawing
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
248 return SDL_BlendFillRect_ARGB8888(dst, rect, blendMode, r, g, b, a);
2898
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
249 }
2896
1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 2888
diff changeset
250 break;
1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 2888
diff changeset
251 }
3536
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 2900
diff changeset
252 break;
2898
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
253 default:
2896
1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 2888
diff changeset
254 break;
1ef2f1e75ff7 Date: Sat, 20 Dec 2008 23:25:19 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 2888
diff changeset
255 }
2898
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
256
3536
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 2900
diff changeset
257 if (!dst->format->Amask) {
3593
b931bcfd94a0 In the process of adding rectangle drawing
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
258 return SDL_BlendFillRect_RGB(dst, rect, blendMode, r, g, b, a);
2898
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
259 } else {
3593
b931bcfd94a0 In the process of adding rectangle drawing
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
260 return SDL_BlendFillRect_RGBA(dst, rect, blendMode, r, g, b, a);
2898
e40448bc7727 Share code between fill and line drawing
Sam Lantinga <slouken@libsdl.org>
parents: 2896
diff changeset
261 }
2888
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
262 }
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
263
3536
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 2900
diff changeset
264 int
3593
b931bcfd94a0 In the process of adding rectangle drawing
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
265 SDL_BlendFillRects(SDL_Surface * dst, const SDL_Rect ** rects, int count,
b931bcfd94a0 In the process of adding rectangle drawing
Sam Lantinga <slouken@libsdl.org>
parents: 3536
diff changeset
266 int blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
3536
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 2900
diff changeset
267 {
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 2900
diff changeset
268 SDL_Rect clipped;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 2900
diff changeset
269 int i;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 2900
diff changeset
270 int (*func)(SDL_Surface * dst, const SDL_Rect * rect,
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 2900
diff changeset
271 int blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a) = NULL;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 2900
diff changeset
272 int status = 0;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 2900
diff changeset
273
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 2900
diff changeset
274 if (!dst) {
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 2900
diff changeset
275 SDL_SetError("Passed NULL destination surface");
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 2900
diff changeset
276 return -1;
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 2900
diff changeset
277 }
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 2900
diff changeset
278
0267b8b1595c Added interfaces for batch drawing of points, lines and rects:
Sam Lantinga <slouken@libsdl.org>
parents: 2900
diff changeset
279 /* This function doesn't work on surfaces < 8 bpp */
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280 if (dst->format->BitsPerPixel < 8) {
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281 SDL_SetError("SDL_BlendFillRects(): Unsupported surface format");
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282 return -1;
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283 }
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284
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285 if (blendMode == SDL_BLENDMODE_BLEND || blendMode == SDL_BLENDMODE_ADD) {
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286 r = DRAW_MUL(r, a);
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287 g = DRAW_MUL(g, a);
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288 b = DRAW_MUL(b, a);
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289 }
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290
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291 /* FIXME: Does this function pointer slow things down significantly? */
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292 switch (dst->format->BitsPerPixel) {
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293 case 15:
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294 switch (dst->format->Rmask) {
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295 case 0x7C00:
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296 func = SDL_BlendFillRect_RGB555;
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297 }
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298 break;
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299 case 16:
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300 switch (dst->format->Rmask) {
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301 case 0xF800:
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302 func = SDL_BlendFillRect_RGB565;
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303 }
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304 break;
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305 case 32:
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306 switch (dst->format->Rmask) {
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307 case 0x00FF0000:
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308 if (!dst->format->Amask) {
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309 func = SDL_BlendFillRect_RGB888;
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310 } else {
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311 func = SDL_BlendFillRect_ARGB8888;
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312 }
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313 break;
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314 }
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315 break;
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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_BlendFillRect_RGB;
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323 } else {
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324 func = SDL_BlendFillRect_RGBA;
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325 }
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326 }
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327
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328 for (i = 0; i < count; ++i) {
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329 const SDL_Rect * rect = rects[i];
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330
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331 /* If 'rect' == NULL, then fill the whole surface */
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332 if (rect) {
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333 /* Perform clipping */
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diff changeset
334 if (!SDL_IntersectRect(rect, &dst->clip_rect, &clipped)) {
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diff changeset
335 continue;
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diff changeset
336 }
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337 rect = &clipped;
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diff changeset
338 } else {
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diff changeset
339 rect = &dst->clip_rect;
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340 }
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diff changeset
341
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342 status = func(dst, rect, blendMode, r, g, b, a);
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343 }
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344 return status;
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345 }
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346
2888
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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parents:
diff changeset
347 /* vi: set ts=4 sw=4 expandtab: */