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annotate src/video/win32/SDL_win32shape.c @ 4844:c4f5bcaf7572

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Switched over to poly-polygon region building and shape-tree traversal for Win32.
author egottlieb
date Tue, 10 Aug 2010 15:39:46 -0400
parents 05d172e92b52
children 40b46225e3cf
rev   line source
4777
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 2010 Eli Gottlieb
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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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
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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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 Eli Gottlieb
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20 eligottlieb@gmail.com
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21 */
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22
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23 #include "SDL_win32shape.h"
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24 #include "SDL_win32video.h"
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25
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26 SDL_WindowShaper*
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27 Win32_CreateShaper(SDL_Window * window) {
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28 int resized_properly;
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29 SDL_WindowShaper* result = (SDL_WindowShaper *)SDL_malloc(sizeof(SDL_WindowShaper));
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30 result->window = window;
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31 result->mode.mode = ShapeModeDefault;
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32 result->mode.parameters.binarizationCutoff = 1;
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33 result->usershownflag = 0;
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34 result->driverdata = (SDL_ShapeData*)SDL_malloc(sizeof(SDL_ShapeData));
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35 ((SDL_ShapeData*)result->driverdata)->mask_tree = NULL;
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36 //Put some driver-data here.
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37 window->shaper = result;
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38 resized_properly = Win32_ResizeWindowShape(window);
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39 if (resized_properly != 0)
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40 return NULL;
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41
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42 return result;
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43 }
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44
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45 typedef struct {
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46 POINT corners[4];
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47 void* next;
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48 } SDL_ShapeRect;
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49
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50 void
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51 CombineRectRegions(SDL_ShapeTree* node,void* closure) {
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52 SDL_ShapeRect* rect_list = *((SDL_ShapeRect**)closure);
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53 if(node->kind == OpaqueShape) {
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54 SDL_ShapeRect* rect = SDL_malloc(sizeof(SDL_ShapeRect));
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55 rect->corners[0].x = node->data.shape.x; rect->corners[0].y = node->data.shape.y;
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56 rect->corners[1].x = node->data.shape.x + node->data.shape.w; rect->corners[1].y = node->data.shape.y;
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57 rect->corners[2].x = node->data.shape.x + node->data.shape.w; rect->corners[2].y = node->data.shape.y + node->data.shape.h;
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58 rect->corners[3].x = node->data.shape.x; rect->corners[3].y = node->data.shape.y + node->data.shape.h;
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59 rect->next = *((SDL_ShapeRect**)closure);
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60 *((SDL_ShapeRect**)closure) = rect;
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61 }
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62 }
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63
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64 Uint32 num_shape_rects(SDL_ShapeRect* rect) {
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65 if(rect == NULL)
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66 return 0;
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67 else
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68 return 1 + num_shape_rects(rect->next);
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69 }
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70
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71 int
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72 Win32_SetWindowShape(SDL_WindowShaper *shaper,SDL_Surface *shape,SDL_WindowShapeMode *shapeMode) {
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73 SDL_ShapeData *data;
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74 HRGN mask_region;
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75 SDL_ShapeRect* rects = NULL,*old = NULL;
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76 Uint16 num_rects = 0,i = 0;
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77 int* polygonVertexNumbers = NULL;
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78 POINT* polygons = NULL;
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79
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80 if (shaper == NULL || shape == NULL)
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81 return SDL_INVALID_SHAPE_ARGUMENT;
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82 if(shape->format->Amask == 0 && shapeMode->mode != ShapeModeColorKey || shape->w != shaper->window->w || shape->h != shaper->window->h)
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83 return SDL_INVALID_SHAPE_ARGUMENT;
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84
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85 data = (SDL_ShapeData*)shaper->driverdata;
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86 if(data->mask_tree != NULL)
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87 SDL_FreeShapeTree(&data->mask_tree);
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88 data->mask_tree = SDL_CalculateShapeTree(*shapeMode,shape);
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89
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90 SDL_TraverseShapeTree(data->mask_tree,&CombineRectRegions,&rects);
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91 num_rects = num_shape_rects(rects);
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92 polygonVertexNumbers = (int*)SDL_malloc(sizeof(int)*num_rects);
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93 for(i=0;i<num_rects;i++)
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94 polygonVertexNumbers[i] = 4;
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95 polygons = (POINT*)SDL_malloc(sizeof(POINT)*4*num_rects);
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96 for(i=0;i<num_rects*4;i++) {
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97 polygons[i] = rects[i / 4].corners[i % 4];
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98 if(i % 4 == 3) {
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99 old = rects;
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100 rects = rects->next;
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101 SDL_free(old);
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102 }
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103 }
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104
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105 /*
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106 * Set the new region mask for the window
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107 */
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108 mask_region = CreatePolyPolygonRgn(polygons,polygonVertexNumbers,num_rects,WINDING);
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109 SetWindowRgn(((SDL_WindowData *)(shaper->window->driverdata))->hwnd, mask_region, TRUE);
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110
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111 SDL_free(polygons);
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112 SDL_free(polygonVertexNumbers);
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113
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114 return 0;
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115 }
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116
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117 int
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118 Win32_ResizeWindowShape(SDL_Window *window) {
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119 SDL_ShapeData* data;
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93402b9dd20c Added Andreas's patch to fix my silly C++-style errors.
Eli Gottlieb <eligottlieb@gmail.com>
parents: 4813
diff changeset
120
4838
1f9915666afd Reformatting code to match the rest of SDL. Variable names seem OK; replaced tabs with 4 spaces each for indentation.
Eli Gottlieb <eligottlieb@gmail.com>
parents: 4822
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121 if (window == NULL)
1f9915666afd Reformatting code to match the rest of SDL. Variable names seem OK; replaced tabs with 4 spaces each for indentation.
Eli Gottlieb <eligottlieb@gmail.com>
parents: 4822
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122 return -1;
1f9915666afd Reformatting code to match the rest of SDL. Variable names seem OK; replaced tabs with 4 spaces each for indentation.
Eli Gottlieb <eligottlieb@gmail.com>
parents: 4822
diff changeset
123 data = (SDL_ShapeData *)window->shaper->driverdata;
1f9915666afd Reformatting code to match the rest of SDL. Variable names seem OK; replaced tabs with 4 spaces each for indentation.
Eli Gottlieb <eligottlieb@gmail.com>
parents: 4822
diff changeset
124 if (data == NULL)
1f9915666afd Reformatting code to match the rest of SDL. Variable names seem OK; replaced tabs with 4 spaces each for indentation.
Eli Gottlieb <eligottlieb@gmail.com>
parents: 4822
diff changeset
125 return -1;
1f9915666afd Reformatting code to match the rest of SDL. Variable names seem OK; replaced tabs with 4 spaces each for indentation.
Eli Gottlieb <eligottlieb@gmail.com>
parents: 4822
diff changeset
126
1f9915666afd Reformatting code to match the rest of SDL. Variable names seem OK; replaced tabs with 4 spaces each for indentation.
Eli Gottlieb <eligottlieb@gmail.com>
parents: 4822
diff changeset
127 if(data->mask_tree != NULL)
1f9915666afd Reformatting code to match the rest of SDL. Variable names seem OK; replaced tabs with 4 spaces each for indentation.
Eli Gottlieb <eligottlieb@gmail.com>
parents: 4822
diff changeset
128 SDL_FreeShapeTree(&data->mask_tree);
1f9915666afd Reformatting code to match the rest of SDL. Variable names seem OK; replaced tabs with 4 spaces each for indentation.
Eli Gottlieb <eligottlieb@gmail.com>
parents: 4822
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129
1f9915666afd Reformatting code to match the rest of SDL. Variable names seem OK; replaced tabs with 4 spaces each for indentation.
Eli Gottlieb <eligottlieb@gmail.com>
parents: 4822
diff changeset
130 window->shaper->usershownflag |= window->flags & SDL_WINDOW_SHOWN;
1f9915666afd Reformatting code to match the rest of SDL. Variable names seem OK; replaced tabs with 4 spaces each for indentation.
Eli Gottlieb <eligottlieb@gmail.com>
parents: 4822
diff changeset
131
1f9915666afd Reformatting code to match the rest of SDL. Variable names seem OK; replaced tabs with 4 spaces each for indentation.
Eli Gottlieb <eligottlieb@gmail.com>
parents: 4822
diff changeset
132 return 0;
4785
ef8b32ef9793 Updated test code, updated win32 code a bit (still not complete, but hopefully tonight), and removed the last vestiges of ellipse and polygon drawing support.
Eli Gottlieb <eligottlieb@gmail.com>
parents: 4777
diff changeset
133 }