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annotate src/video/SDL_shape.c @ 4847:4201864f77e7

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Fixing variable naming style.
author egottlieb
date Tue, 10 Aug 2010 16:30:53 -0400
parents 4f1573996a65
children b67815cf9f25
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
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3 Copyright (C) 2010 Eli Gottlieb
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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.
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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.
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9
5ff305de5834 Added stub files, working on sample program SDLeyes.
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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.
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
5ff305de5834 Added stub files, working on sample program SDLeyes.
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13 Lesser General Public License for more details.
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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
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18
5ff305de5834 Added stub files, working on sample program SDLeyes.
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19 Eli Gottlieb
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20 eligottlieb@gmail.com
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21 */
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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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22 #include "SDL_config.h"
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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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24 #include "SDL.h"
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25 #include "SDL_assert.h"
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26 #include "SDL_video.h"
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27 #include "SDL_sysvideo.h"
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28 #include "SDL_pixels.h"
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29 #include "SDL_surface.h"
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30 #include "SDL_shape.h"
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31 #include "SDL_shape_internals.h"
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32
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33 SDL_Window*
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34 SDL_CreateShapedWindow(const char *title,unsigned int x,unsigned int y,unsigned int w,unsigned int h,Uint32 flags) {
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35 SDL_Window *result = SDL_CreateWindow(title,x,y,w,h,SDL_WINDOW_BORDERLESS | flags & !SDL_WINDOW_FULLSCREEN & !SDL_WINDOW_SHOWN);
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36 if(result != NULL) {
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37 result->shaper = result->display->device->shape_driver.CreateShaper(result);
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38 if(result->shaper != NULL) {
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39 result->shaper->usershownflag = flags & SDL_WINDOW_SHOWN;
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40 result->shaper->mode.mode = ShapeModeDefault;
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41 result->shaper->mode.parameters.binarizationCutoff = 1;
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42 result->shaper->hasshape = SDL_FALSE;
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43 return result;
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44 }
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45 else {
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46 SDL_DestroyWindow(result);
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47 return NULL;
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48 }
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49 }
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50 else
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51 return NULL;
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52 }
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53
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54 SDL_bool
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55 SDL_IsShapedWindow(const SDL_Window *window) {
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56 if(window == NULL)
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57 return SDL_FALSE;
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58 else
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59 return (SDL_bool)(window->shaper != NULL);
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60 }
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61
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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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62 /* REQUIRES that bitmap point to a w-by-h bitmap with ppb pixels-per-byte. */
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63 void
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64 SDL_CalculateShapeBitmap(SDL_WindowShapeMode mode,SDL_Surface *shape,Uint8* bitmap,Uint8 ppb) {
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65 int x = 0;
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66 int y = 0;
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67 Uint8 r = 0,g = 0,b = 0,alpha = 0;
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68 Uint8* pixel = NULL;
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69 Uint32 bitmap_pixel,pixel_value = 0,mask_value = 0;
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70 SDL_Color key;
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71 if(SDL_MUSTLOCK(shape))
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72 SDL_LockSurface(shape);
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73 pixel = (Uint8*)shape->pixels;
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74 for(y = 0;y<shape->h;y++) {
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75 for(x=0;x<shape->w;x++) {
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76 alpha = 0;
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77 pixel_value = 0;
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78 pixel = (Uint8 *)(shape->pixels) + (y*shape->pitch) + (x*shape->format->BytesPerPixel);
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79 switch(shape->format->BytesPerPixel) {
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80 case(1):
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81 pixel_value = *(Uint8*)pixel;
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82 break;
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83 case(2):
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84 pixel_value = *(Uint16*)pixel;
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85 break;
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86 case(3):
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87 pixel_value = *(Uint32*)pixel & (~shape->format->Amask);
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88 break;
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89 case(4):
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90 pixel_value = *(Uint32*)pixel;
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91 break;
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92 }
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93 SDL_GetRGBA(pixel_value,shape->format,&r,&g,&b,&alpha);
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94 bitmap_pixel = y*shape->w + x;
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95 switch(mode.mode) {
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96 case(ShapeModeDefault):
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97 mask_value = (alpha >= 1 ? 1 : 0);
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98 break;
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99 case(ShapeModeBinarizeAlpha):
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100 mask_value = (alpha >= mode.parameters.binarizationCutoff ? 1 : 0);
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101 break;
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102 case(ShapeModeReverseBinarizeAlpha):
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103 mask_value = (alpha <= mode.parameters.binarizationCutoff ? 1 : 0);
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104 break;
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105 case(ShapeModeColorKey):
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106 key = mode.parameters.colorKey;
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107 mask_value = ((key.r != r || key.g != g || key.b != b) ? 1 : 0);
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108 break;
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109 }
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110 bitmap[bitmap_pixel / ppb] |= mask_value << (7 - ((ppb - 1) - (bitmap_pixel % ppb)));
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111 }
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112 }
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113 if(SDL_MUSTLOCK(shape))
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114 SDL_UnlockSurface(shape);
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115 }
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116
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117 SDL_ShapeTree*
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118 RecursivelyCalculateShapeTree(SDL_WindowShapeMode mode,SDL_Surface* mask,SDL_Rect dimensions) {
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119 int x = 0,y = 0;
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120 Uint8* pixel = NULL;
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121 Uint32 pixel_value = 0;
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122 Uint8 r = 0,g = 0,b = 0,a = 0;
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123 SDL_bool pixel_opaque = SDL_FALSE;
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124 int last_opaque = -1;
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125 SDL_Color key;
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126 SDL_ShapeTree* result = (SDL_ShapeTree*)SDL_malloc(sizeof(SDL_ShapeTree));
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127 SDL_Rect next = {0,0,0,0};
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diff changeset
128 for(y=dimensions.y;y<dimensions.y + dimensions.h;y++)
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129 for(x=dimensions.x;x<dimensions.x + dimensions.w;x++) {
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130 pixel_value = 0;
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131 pixel = (Uint8 *)(mask->pixels) + (y*mask->pitch) + (x*mask->format->BytesPerPixel);
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132 switch(mask->format->BytesPerPixel) {
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diff changeset
133 case(1):
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134 pixel_value = *(Uint8*)pixel;
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135 break;
0998d1b5dd23 Fixed formatting of SDL_shape.c post-merge again.
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136 case(2):
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diff changeset
137 pixel_value = *(Uint16*)pixel;
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138 break;
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139 case(3):
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140 pixel_value = *(Uint32*)pixel & (~mask->format->Amask);
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141 break;
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142 case(4):
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143 pixel_value = *(Uint32*)pixel;
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144 break;
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145 }
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146 SDL_GetRGBA(pixel_value,mask->format,&r,&g,&b,&a);
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147 switch(mode.mode) {
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148 case(ShapeModeDefault):
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149 pixel_opaque = (a >= 1 ? SDL_TRUE : SDL_FALSE);
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150 break;
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151 case(ShapeModeBinarizeAlpha):
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152 pixel_opaque = (a >= mode.parameters.binarizationCutoff ? SDL_TRUE : SDL_FALSE);
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153 break;
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154 case(ShapeModeReverseBinarizeAlpha):
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155 pixel_opaque = (a <= mode.parameters.binarizationCutoff ? SDL_TRUE : SDL_FALSE);
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156 break;
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157 case(ShapeModeColorKey):
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158 key = mode.parameters.colorKey;
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159 pixel_opaque = ((key.r == r && key.g == g && key.b == b) ? SDL_TRUE : SDL_FALSE);
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160 break;
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161 }
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diff changeset
162 if(last_opaque == -1)
0998d1b5dd23 Fixed formatting of SDL_shape.c post-merge again.
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diff changeset
163 last_opaque = pixel_opaque;
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164 if(last_opaque != pixel_opaque) {
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165 result->kind = QuadShape;
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166 //These will stay the same.
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167 next.w = dimensions.w / 2;
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168 next.h = dimensions.h / 2;
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169 //These will change from recursion to recursion.
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170 next.x = dimensions.x;
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171 next.y = dimensions.y;
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172 result->data.children.upleft = (struct SDL_ShapeTree *)RecursivelyCalculateShapeTree(mode,mask,next);
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173 next.x = dimensions.w / 2;
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diff changeset
174 //Unneeded: next.y = dimensions.y;
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diff changeset
175 result->data.children.upright = (struct SDL_ShapeTree *)RecursivelyCalculateShapeTree(mode,mask,next);
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176 next.x = dimensions.x;
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diff changeset
177 next.y = dimensions.h / 2;
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diff changeset
178 result->data.children.downleft = (struct SDL_ShapeTree *)RecursivelyCalculateShapeTree(mode,mask,next);
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179 next.x = dimensions.w / 2;
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180 //Unneeded: next.y = dimensions.h / 2 + 1;
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181 result->data.children.downright = (struct SDL_ShapeTree *)RecursivelyCalculateShapeTree(mode,mask,next);
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182 return result;
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183 }
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184 }
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185 //If we never recursed, all the pixels in this quadrant have the same "value".
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186 result->kind = (last_opaque == SDL_TRUE ? OpaqueShape : TransparentShape);
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187 result->data.shape = dimensions;
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188 return result;
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189 }
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190
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191 SDL_ShapeTree*
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192 SDL_CalculateShapeTree(SDL_WindowShapeMode mode,SDL_Surface* shape) {
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193 SDL_Rect dimensions = {0,0,shape->w,shape->h};
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194 SDL_ShapeTree* result = NULL;
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195 if(SDL_MUSTLOCK(shape))
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196 SDL_LockSurface(shape);
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197 result = RecursivelyCalculateShapeTree(mode,shape,dimensions);
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diff changeset
198 if(SDL_MUSTLOCK(shape))
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diff changeset
199 SDL_UnlockSurface(shape);
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200 return result;
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201 }
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202
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diff changeset
203 void
0998d1b5dd23 Fixed formatting of SDL_shape.c post-merge again.
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diff changeset
204 SDL_TraverseShapeTree(SDL_ShapeTree *tree,SDL_TraversalFunction function,void* closure) {
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diff changeset
205 SDL_assert(tree != NULL);
0998d1b5dd23 Fixed formatting of SDL_shape.c post-merge again.
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diff changeset
206 if(tree->kind == QuadShape) {
0998d1b5dd23 Fixed formatting of SDL_shape.c post-merge again.
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diff changeset
207 SDL_TraverseShapeTree((SDL_ShapeTree *)tree->data.children.upleft,function,closure);
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diff changeset
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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diff changeset
211 }
0998d1b5dd23 Fixed formatting of SDL_shape.c post-merge again.
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diff changeset
212 else
0998d1b5dd23 Fixed formatting of SDL_shape.c post-merge again.
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diff changeset
213 function(tree,closure);
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214 }
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215
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diff changeset
216 void
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diff changeset
217 SDL_FreeShapeTree(SDL_ShapeTree** shapeTree) {
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diff changeset
218 if((*shapeTree)->kind == QuadShape) {
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diff changeset
219 SDL_FreeShapeTree((SDL_ShapeTree **)&(*shapeTree)->data.children.upleft);
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diff changeset
220 SDL_FreeShapeTree((SDL_ShapeTree **)&(*shapeTree)->data.children.upright);
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diff changeset
221 SDL_FreeShapeTree((SDL_ShapeTree **)&(*shapeTree)->data.children.downleft);
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diff changeset
222 SDL_FreeShapeTree((SDL_ShapeTree **)&(*shapeTree)->data.children.downright);
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diff changeset
223 }
0998d1b5dd23 Fixed formatting of SDL_shape.c post-merge again.
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diff changeset
224 SDL_free(*shapeTree);
0998d1b5dd23 Fixed formatting of SDL_shape.c post-merge again.
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diff changeset
225 *shapeTree = NULL;
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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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diff changeset
227
4843
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diff changeset
228 int
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diff changeset
229 SDL_SetWindowShape(SDL_Window *window,SDL_Surface *shape,SDL_WindowShapeMode *shape_mode) {
4843
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diff changeset
230 int result;
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diff changeset
231 if(window == NULL || !SDL_IsShapedWindow(window))
0998d1b5dd23 Fixed formatting of SDL_shape.c post-merge again.
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diff changeset
232 //The window given was not a shapeable window.
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diff changeset
233 return SDL_NONSHAPEABLE_WINDOW;
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diff changeset
234 if(shape == NULL)
0998d1b5dd23 Fixed formatting of SDL_shape.c post-merge again.
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diff changeset
235 //Invalid shape argument.
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diff changeset
236 return SDL_INVALID_SHAPE_ARGUMENT;
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diff changeset
237
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diff changeset
238 if(shape_mode != NULL)
4201864f77e7 Fixing variable naming style.
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diff changeset
239 window->shaper->mode = *shape_mode;
4201864f77e7 Fixing variable naming style.
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diff changeset
240 result = window->display->device->shape_driver.SetWindowShape(window->shaper,shape,shape_mode);
4843
0998d1b5dd23 Fixed formatting of SDL_shape.c post-merge again.
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diff changeset
241 window->shaper->hasshape = SDL_TRUE;
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diff changeset
242 if((window->shaper->usershownflag & SDL_WINDOW_SHOWN) == SDL_WINDOW_SHOWN) {
0998d1b5dd23 Fixed formatting of SDL_shape.c post-merge again.
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diff changeset
243 SDL_ShowWindow(window);
0998d1b5dd23 Fixed formatting of SDL_shape.c post-merge again.
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diff changeset
244 window->shaper->usershownflag &= !SDL_WINDOW_SHOWN;
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diff changeset
245 }
0998d1b5dd23 Fixed formatting of SDL_shape.c post-merge again.
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diff changeset
246 return result;
4782
b6930aefd008 Finished X11 shaped-window functionality and removed ellipse+polygon rendering.
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parents: 4781
diff changeset
247 }
b6930aefd008 Finished X11 shaped-window functionality and removed ellipse+polygon rendering.
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parents: 4781
diff changeset
248
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249 SDL_bool
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250 SDL_WindowHasAShape(SDL_Window *window) {
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251 if (window == NULL || !SDL_IsShapedWindow(window))
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252 return SDL_FALSE;
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253 return window->shaper->hasshape;
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254 }
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255
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256 int
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257 SDL_GetShapedWindowMode(SDL_Window *window,SDL_WindowShapeMode *shape_mode) {
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258 if(window != NULL && SDL_IsShapedWindow(window)) {
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259 if(shape_mode == NULL) {
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260 if(SDL_WindowHasAShape(window))
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261 //The window given has a shape.
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262 return 0;
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263 else
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264 //The window given is shapeable but lacks a shape.
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265 return SDL_WINDOW_LACKS_SHAPE;
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266 }
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267 else {
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268 *shape_mode = window->shaper->mode;
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269 return 0;
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270 }
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271 }
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272 else
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273 //The window given is not a valid shapeable window.
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274 return SDL_NONSHAPEABLE_WINDOW;
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275 }