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annotate src/video/SDL_shape.c @ 4838:1f9915666afd

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Reformatting code to match the rest of SDL. Variable names seem OK; replaced tabs with 4 spaces each for indentation.
author Eli Gottlieb <eligottlieb@gmail.com>
date Mon, 09 Aug 2010 15:37:20 -0400
parents 55f32099a4b5
children 05d172e92b52
rev   line source
4765
5ff305de5834 Added stub files, working on sample program SDLeyes.
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1 /*
5ff305de5834 Added stub files, working on sample program SDLeyes.
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2 SDL - Simple DirectMedia Layer
5ff305de5834 Added stub files, working on sample program SDLeyes.
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3 Copyright (C) 2010 Eli Gottlieb
5ff305de5834 Added stub files, working on sample program SDLeyes.
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4
5ff305de5834 Added stub files, working on sample program SDLeyes.
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5 This library is free software; you can redistribute it and/or
5ff305de5834 Added stub files, working on sample program SDLeyes.
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6 modify it under the terms of the GNU Lesser General Public
5ff305de5834 Added stub files, working on sample program SDLeyes.
Eli Gottlieb <eligottlieb@gmail.com>
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7 License as published by the Free Software Foundation; either
5ff305de5834 Added stub files, working on sample program SDLeyes.
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8 version 2.1 of the License, or (at your option) any later version.
5ff305de5834 Added stub files, working on sample program SDLeyes.
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9
5ff305de5834 Added stub files, working on sample program SDLeyes.
Eli Gottlieb <eligottlieb@gmail.com>
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10 This library is distributed in the hope that it will be useful,
5ff305de5834 Added stub files, working on sample program SDLeyes.
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
5ff305de5834 Added stub files, working on sample program SDLeyes.
Eli Gottlieb <eligottlieb@gmail.com>
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
5ff305de5834 Added stub files, working on sample program SDLeyes.
Eli Gottlieb <eligottlieb@gmail.com>
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13 Lesser General Public License for more details.
5ff305de5834 Added stub files, working on sample program SDLeyes.
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14
5ff305de5834 Added stub files, working on sample program SDLeyes.
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15 You should have received a copy of the GNU Lesser General Public
5ff305de5834 Added stub files, working on sample program SDLeyes.
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16 License along with this library; if not, write to the Free Software
5ff305de5834 Added stub files, working on sample program SDLeyes.
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
5ff305de5834 Added stub files, working on sample program SDLeyes.
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18
5ff305de5834 Added stub files, working on sample program SDLeyes.
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19 Eli Gottlieb
5ff305de5834 Added stub files, working on sample program SDLeyes.
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20 eligottlieb@gmail.com
5ff305de5834 Added stub files, working on sample program SDLeyes.
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21 */
4769
83f9b95da263 Added the standard headers and footers that make SDL_shape.h and SDL_shape.c integrate properly into the build.
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22 #include "SDL_config.h"
4776
29dcad9c58b3 Removed and added back SDL_shape.{c,h} wholesale. Will this get them tracked properly?
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23
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83f9b95da263 Added the standard headers and footers that make SDL_shape.h and SDL_shape.c integrate properly into the build.
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24 #include "SDL.h"
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25 #include "SDL_video.h"
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26 #include "SDL_sysvideo.h"
4782
b6930aefd008 Finished X11 shaped-window functionality and removed ellipse+polygon rendering.
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27 #include "SDL_pixels.h"
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28 #include "SDL_surface.h"
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29 #include "SDL_shape.h"
4817
c68e7490e4cf Fixed a couple of bugs in the general and X11 shape code, and fixed a bug in testshape that was keeping it from recognizing surfaces without alpha. Thanks to Andreas's bit-bashing tip, X11 shaped windows now work entirely, AFAICT.
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30 #include "../src/video/SDL_shape_internals.h"
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7b50faf23907 Moved SDL_shape.h, and building out the API as needed by SDL_Eyes.
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31
4838
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32 SDL_Window*
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33 SDL_CreateShapedWindow(const char *title,unsigned int x,unsigned int y,unsigned int w,unsigned int h,Uint32 flags) {
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34 SDL_Window *result = SDL_CreateWindow(title,x,y,w,h,SDL_WINDOW_BORDERLESS | flags & !SDL_WINDOW_FULLSCREEN & !SDL_WINDOW_SHOWN);
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35 if(result != NULL) {
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36 result->shaper = result->display->device->shape_driver.CreateShaper(result);
1f9915666afd Reformatting code to match the rest of SDL. Variable names seem OK; replaced tabs with 4 spaces each for indentation.
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37 if(result->shaper != NULL) {
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38 result->shaper->usershownflag = flags & SDL_WINDOW_SHOWN;
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39 result->shaper->mode.mode = ShapeModeDefault;
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40 result->shaper->mode.parameters.binarizationCutoff = 1;
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41 result->shaper->hasshape = SDL_FALSE;
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42 return result;
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43 }
1f9915666afd Reformatting code to match the rest of SDL. Variable names seem OK; replaced tabs with 4 spaces each for indentation.
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44 else {
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45 SDL_DestroyWindow(result);
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46 return NULL;
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47 }
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48 }
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49 else
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50 return NULL;
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51 }
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52
4838
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53 SDL_bool
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54 SDL_IsShapedWindow(const SDL_Window *window) {
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55 if(window == NULL)
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56 return SDL_FALSE;
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57 else
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58 return (SDL_bool)(window->shaper != NULL);
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b6930aefd008 Finished X11 shaped-window functionality and removed ellipse+polygon rendering.
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59 }
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60
4813
5b4c7d7d8953 Wrote out the system for breaking shape-masks into quad-trees of rectangles, and added code to conglomerate those quad-trees of rectangles into regions for setting shapes under Win32.
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parents: 4810
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61 /* REQUIRES that bitmap point to a w-by-h bitmap with ppb pixels-per-byte. */
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62 void
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63 SDL_CalculateShapeBitmap(SDL_WindowShapeMode mode,SDL_Surface *shape,Uint8* bitmap,Uint8 ppb) {
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64 int x = 0;
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65 int y = 0;
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66 Uint8 r = 0,g = 0,b = 0,alpha = 0;
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67 Uint8* pixel = NULL;
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68 Uint32 bitmap_pixel,pixel_value = 0,mask_value = 0;
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69 SDL_Color key;
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70 if(SDL_MUSTLOCK(shape))
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71 SDL_LockSurface(shape);
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72 pixel = (Uint8*)shape->pixels;
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73 for(y = 0;y<shape->h;y++) {
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74 for(x=0;x<shape->w;x++) {
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parents: 4822
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75 alpha = 0;
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76 pixel_value = 0;
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77 pixel = (Uint8 *)(shape->pixels) + (y*shape->pitch) + (x*shape->format->BytesPerPixel);
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78 switch(shape->format->BytesPerPixel) {
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79 case(1):
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80 pixel_value = *(Uint8*)pixel;
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81 break;
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82 case(2):
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83 pixel_value = *(Uint16*)pixel;
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84 break;
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85 case(3):
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86 pixel_value = *(Uint32*)pixel & (~shape->format->Amask);
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87 break;
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88 case(4):
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89 pixel_value = *(Uint32*)pixel;
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90 break;
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91 }
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92 SDL_GetRGBA(pixel_value,shape->format,&r,&g,&b,&alpha);
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93 bitmap_pixel = y*shape->w + x;
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94 switch(mode.mode) {
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95 case(ShapeModeDefault):
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96 mask_value = (alpha >= 1 ? 1 : 0);
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97 break;
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98 case(ShapeModeBinarizeAlpha):
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99 mask_value = (alpha >= mode.parameters.binarizationCutoff ? 1 : 0);
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100 break;
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101 case(ShapeModeReverseBinarizeAlpha):
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102 mask_value = (alpha <= mode.parameters.binarizationCutoff ? 1 : 0);
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103 break;
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104 case(ShapeModeColorKey):
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105 key = mode.parameters.colorKey;
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106 mask_value = ((key.r != r && key.g != g && key.b != b) ? 1 : 0);
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107 break;
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108 }
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109 bitmap[bitmap_pixel / ppb] |= mask_value << (7 - ((ppb - 1) - (bitmap_pixel % ppb)));
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110 }
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111 }
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112 if(SDL_MUSTLOCK(shape))
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113 SDL_UnlockSurface(shape);
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114 }
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115
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116 SDL_ShapeTree*
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117 RecursivelyCalculateShapeTree(SDL_WindowShapeMode mode,SDL_Surface* mask,SDL_bool invert,SDL_Rect dimensions) {
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118 int x = 0,y = 0;
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119 Uint8* pixel = NULL;
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120 Uint32 pixel_value = 0;
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121 Uint8 r = 0,g = 0,b = 0,a = 0;
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122 SDL_bool pixel_transparent = SDL_FALSE;
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123 int last_transparent = -1;
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124 SDL_Color key;
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125 SDL_ShapeTree* result = (SDL_ShapeTree*)SDL_malloc(sizeof(SDL_ShapeTree));
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126 SDL_Rect next = {0,0,0,0};
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127 for(y=dimensions.y;y<dimensions.h;y++)
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128 for(x=dimensions.x;x<dimensions.w;x++) {
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129 pixel_value = 0;
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130 pixel = (Uint8 *)(mask->pixels) + (y*mask->pitch) + (x*mask->format->BytesPerPixel);
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131 switch(mask->format->BytesPerPixel) {
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132 case(1):
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133 pixel_value = *(Uint8*)pixel;
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134 break;
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135 case(2):
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136 pixel_value = *(Uint16*)pixel;
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137 break;
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138 case(3):
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139 pixel_value = *(Uint32*)pixel & (~mask->format->Amask);
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140 break;
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141 case(4):
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142 pixel_value = *(Uint32*)pixel;
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143 break;
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144 }
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145 SDL_GetRGBA(pixel_value,mask->format,&r,&g,&b,&a);
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146 switch(mode.mode) {
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147 case(ShapeModeDefault):
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148 pixel_transparent = (SDL_bool)(a >= 1 ? !invert : invert);
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149 break;
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150 case(ShapeModeBinarizeAlpha):
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151 pixel_transparent = (SDL_bool)(a >= mode.parameters.binarizationCutoff ? !invert : invert);
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152 break;
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153 case(ShapeModeReverseBinarizeAlpha):
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154 pixel_transparent = (SDL_bool)(a <= mode.parameters.binarizationCutoff ? !invert : invert);
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155 break;
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156 case(ShapeModeColorKey):
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157 key = mode.parameters.colorKey;
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158 pixel_transparent = (SDL_bool)((key.r == r && key.g == g && key.b == b) ? !invert : invert);
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159 break;
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160 }
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161 if(last_transparent == -1) {
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162 last_transparent = pixel_transparent;
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163 break;
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164 }
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165 if(last_transparent != pixel_transparent) {
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166 result->kind = QuadShape;
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167 //These will stay the same.
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168 next.w = dimensions.w / 2;
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169 next.h = dimensions.h / 2;
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170 //These will change from recursion to recursion.
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171 next.x = dimensions.x;
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172 next.y = dimensions.y;
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173 result->data.children.upleft = (struct SDL_ShapeTree *)RecursivelyCalculateShapeTree(mode,mask,invert,next);
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174 next.x = dimensions.w / 2 + 1;
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175 //Unneeded: next.y = dimensions.y;
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176 result->data.children.upright = (struct SDL_ShapeTree *)RecursivelyCalculateShapeTree(mode,mask,invert,next);
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177 next.x = dimensions.x;
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178 next.y = dimensions.h / 2 + 1;
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179 result->data.children.downleft = (struct SDL_ShapeTree *)RecursivelyCalculateShapeTree(mode,mask,invert,next);
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180 next.x = dimensions.w / 2 + 1;
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181 //Unneeded: next.y = dimensions.h / 2 + 1;
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182 result->data.children.downright = (struct SDL_ShapeTree *)RecursivelyCalculateShapeTree(mode,mask,invert,next);
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183 return result;
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184 }
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185 }
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186 //If we never recursed, all the pixels in this quadrant have the same "value".
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187 result->kind = (last_transparent == SDL_FALSE ? OpaqueShape : TransparentShape);
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188 result->data.shape = dimensions;
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189 return result;
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5b4c7d7d8953 Wrote out the system for breaking shape-masks into quad-trees of rectangles, and added code to conglomerate those quad-trees of rectangles into regions for setting shapes under Win32.
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190 }
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191
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192 SDL_ShapeTree*
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193 SDL_CalculateShapeTree(SDL_WindowShapeMode mode,SDL_Surface* shape,SDL_bool invert) {
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194 SDL_Rect dimensions = {0,0,shape->w,shape->h};
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195 SDL_ShapeTree* result = NULL;
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196 if(SDL_MUSTLOCK(shape))
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197 SDL_LockSurface(shape);
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198 result = RecursivelyCalculateShapeTree(mode,shape,invert,dimensions);
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199 if(SDL_MUSTLOCK(shape))
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200 SDL_UnlockSurface(shape);
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201 return result;
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5b4c7d7d8953 Wrote out the system for breaking shape-masks into quad-trees of rectangles, and added code to conglomerate those quad-trees of rectangles into regions for setting shapes under Win32.
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parents: 4810
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202 }
5b4c7d7d8953 Wrote out the system for breaking shape-masks into quad-trees of rectangles, and added code to conglomerate those quad-trees of rectangles into regions for setting shapes under Win32.
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203
4838
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204 void
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205 SDL_TraverseShapeTree(SDL_ShapeTree *tree,void(*function)(SDL_ShapeTree*,void*),void* closure) {
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206 if(tree->kind == QuadShape) {
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207 SDL_TraverseShapeTree((SDL_ShapeTree *)tree->data.children.upleft,function,closure);
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208 SDL_TraverseShapeTree((SDL_ShapeTree *)tree->data.children.upright,function,closure);
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diff changeset
209 SDL_TraverseShapeTree((SDL_ShapeTree *)tree->data.children.downleft,function,closure);
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diff changeset
210 SDL_TraverseShapeTree((SDL_ShapeTree *)tree->data.children.downright,function,closure);
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211 }
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diff changeset
212 else
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diff changeset
213 function(tree,closure);
4813
5b4c7d7d8953 Wrote out the system for breaking shape-masks into quad-trees of rectangles, and added code to conglomerate those quad-trees of rectangles into regions for setting shapes under Win32.
Eli Gottlieb <eligottlieb@gmail.com>
parents: 4810
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214 }
5b4c7d7d8953 Wrote out the system for breaking shape-masks into quad-trees of rectangles, and added code to conglomerate those quad-trees of rectangles into regions for setting shapes under Win32.
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215
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216 void
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217 SDL_FreeShapeTree(SDL_ShapeTree** shapeTree) {
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218 if((*shapeTree)->kind == QuadShape) {
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219 SDL_FreeShapeTree((SDL_ShapeTree **)&(*shapeTree)->data.children.upleft);
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220 SDL_FreeShapeTree((SDL_ShapeTree **)&(*shapeTree)->data.children.upright);
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221 SDL_FreeShapeTree((SDL_ShapeTree **)&(*shapeTree)->data.children.downleft);
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222 SDL_FreeShapeTree((SDL_ShapeTree **)&(*shapeTree)->data.children.downright);
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223 }
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224 SDL_free(*shapeTree);
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225 *shapeTree = NULL;
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5b4c7d7d8953 Wrote out the system for breaking shape-masks into quad-trees of rectangles, and added code to conglomerate those quad-trees of rectangles into regions for setting shapes under Win32.
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226 }
5b4c7d7d8953 Wrote out the system for breaking shape-masks into quad-trees of rectangles, and added code to conglomerate those quad-trees of rectangles into regions for setting shapes under Win32.
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227
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228 int
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229 SDL_SetWindowShape(SDL_Window *window,SDL_Surface *shape,SDL_WindowShapeMode *shapeMode) {
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230 int result;
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231 if(window == NULL || !SDL_IsShapedWindow(window))
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232 //The window given was not a shapeable window.
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233 return SDL_NONSHAPEABLE_WINDOW;
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234 if(shape == NULL)
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235 //Invalid shape argument.
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236 return SDL_INVALID_SHAPE_ARGUMENT;
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237
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238 if(shapeMode != NULL)
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239 window->shaper->mode = *shapeMode;
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240 //TODO: Platform-specific implementations of SetWindowShape. X11 is finished. Win32 is finished. Debugging is in progress on both.
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241 result = window->display->device->shape_driver.SetWindowShape(window->shaper,shape,shapeMode);
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242 window->shaper->hasshape = SDL_TRUE;
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243 if((window->shaper->usershownflag & SDL_WINDOW_SHOWN) == SDL_WINDOW_SHOWN) {
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244 SDL_ShowWindow(window);
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245 window->shaper->usershownflag &= !SDL_WINDOW_SHOWN;
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246 }
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247 return result;
4782
b6930aefd008 Finished X11 shaped-window functionality and removed ellipse+polygon rendering.
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248 }
b6930aefd008 Finished X11 shaped-window functionality and removed ellipse+polygon rendering.
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249
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250 SDL_bool
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251 SDL_WindowHasAShape(SDL_Window *window) {
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252 if (window == NULL && !SDL_IsShapedWindow(window))
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253 return SDL_FALSE;
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254 return window->shaper->hasshape;
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9838d3525a1b Stubbed out the new get/set parameter functions, added the start of the enum, union, and struct for those parameters themselves, and added doxygen comments throughout the SDL_shape.h header.
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255 }
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256
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257 int
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258 SDL_GetShapedWindowMode(SDL_Window *window,SDL_WindowShapeMode *shapeMode) {
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259 if(window != NULL && SDL_IsShapedWindow(window)) {
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260 if(shapeMode == NULL) {
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261 if(SDL_WindowHasAShape(window))
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262 //The window given has a shape.
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263 return 0;
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264 else
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265 //The window given is shapeable but lacks a shape.
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266 return SDL_WINDOW_LACKS_SHAPE;
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267 }
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268 else {
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269 *shapeMode = window->shaper->mode;
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270 return 0;
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271 }
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272 }
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273 else
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274 //The window given is not a valid shapeable window.
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275 return SDL_NONSHAPEABLE_WINDOW;
4778
9838d3525a1b Stubbed out the new get/set parameter functions, added the start of the enum, union, and struct for those parameters themselves, and added doxygen comments throughout the SDL_shape.h header.
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276 }