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annotate engine/core/video/image.h @ 634:5f381fa34769

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* Added the clearBackBuffer() function to the renderbackends. * Renamed setClearScreen() to setClearBackBuffer() * The SDL render backend now honors what was set with setClearBackBuffer() * Documented testRenderedViewPort() * The OpenGL backend no longer clears the screen every frame by default. testRenderedViewPort() takes care of clearing the screen for now. Note: if the user overrides the default and enables clearing of the backbuffer that it may be cleared twice in one frame (OpenGL only)!
author prock@33b003aa-7bff-0310-803a-e67f0ece8222
date Wed, 06 Oct 2010 15:49:53 +0000
parents f3457443c95f
children 5d6b1820b953
rev   line source
0
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1 /***************************************************************************
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2 * Copyright (C) 2005-2008 by the FIFE team *
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3 * http://www.fifengine.de *
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4 * This file is part of FIFE. *
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5 * *
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6 * FIFE is free software; you can redistribute it and/or *
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7 * modify it under the terms of the GNU Lesser General Public *
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8 * License as published by the Free Software Foundation; either *
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9 * version 2.1 of the License, or (at your option) any later version. *
0
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10 * *
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11 * This library is distributed in the hope that it will be useful, *
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12 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
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13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
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14 * Lesser General Public License for more details. *
0
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15 * *
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16 * You should have received a copy of the GNU Lesser General Public *
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17 * License along with this library; if not, write to the *
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18 * Free Software Foundation, Inc., *
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19 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA *
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20 ***************************************************************************/
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21
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22 #ifndef FIFE_VIDEO_IMAGE_H
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23 #define FIFE_VIDEO_IMAGE_H
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24
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25 // Standard C++ library includes
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26 #include <stack>
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27
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28 // 3rd party library includes
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29 #include <SDL.h>
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30 #include <png.h>
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31
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32 // FIFE includes
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33 // These includes are split up in two parts, separated by one empty line
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34 // First block: files included from the FIFE root src directory
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35 // Second block: files included from the same folder
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36 #include "util/base/fife_stdint.h"
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37 #include "util/base/resourceclass.h"
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38 #include "util/resource/resource.h"
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39 #include "util/structures/point.h"
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40 #include "util/structures/rect.h"
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41
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42 namespace FIFE {
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0
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44 class AbstractImage {
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45 public:
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46 virtual ~AbstractImage() {}
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47
0
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48 /** Get the surface used by this image
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49 * @return pointer to used surface
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50 */
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51 virtual SDL_Surface* getSurface() = 0;
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52
0
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53 /** Returns the @b maximum width occupied by this image.
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54 * This should return the maximum width that could be covered by the
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55 * image.
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56 */
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57 virtual unsigned int getWidth() const = 0;
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58
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59 /** Returns the @b maximum height occupied by this image.
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60 */
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61 virtual unsigned int getHeight() const = 0;
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62
0
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63 /** Gets the area of the image
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64 * @return Image area in rect
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65 */
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66 virtual const Rect& getArea() = 0;
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67
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68 /** Writes pixel to given position. Returns true, if pixel was written (not out of bounds)
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69 */
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70 virtual bool putPixel(int x, int y, int r, int g, int b, int a = 255) = 0;
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71
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72 /** Draws line between given points with given RGBA
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73 */
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74 virtual void drawLine(const Point& p1, const Point& p2, int r, int g, int b, int a = 255) = 0;
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75
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76 /** Draws triangle between given points with given RGBA
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77 */
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78 virtual void drawTriangle(const Point& p1, const Point& p2, const Point& p3, int r, int g, int b, int a = 255) = 0;
0
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79
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80 /** Draws an axis parallel rectangle.
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81 */
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82 virtual void drawRectangle(const Point& p, uint16_t w, uint16_t h, uint8_t r, uint8_t g, uint8_t b, uint8_t a = 255) = 0;
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83
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84 /** Draws a filled axis parallel rectangle.
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85 */
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86 virtual void fillRectangle(const Point& p, uint16_t w, uint16_t h, uint8_t r, uint8_t g, uint8_t b, uint8_t a = 255) = 0;
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87
0
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88 /** Draws quad between given points with given RGBA
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89 */
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90 virtual void drawQuad(const Point& p1, const Point& p2, const Point& p3, const Point& p4, int r, int g, int b, int a = 255) = 0;
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91
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92 /** Draws a quad that represents a vertex with given RGBA
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93 */
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94 virtual void drawVertex(const Point& p, const uint8_t size, int r, int g, int b, int a = 255) = 0;
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95
0
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96 /** Returns pixel RGBA values from given position
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97 */
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98 virtual void getPixelRGBA(int x, int y, uint8_t* r, uint8_t* g, uint8_t* b, uint8_t* a) = 0;
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99
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100 /** Pushes clip area to clip stack
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101 * Clip areas define which area is drawn on screen. Usable e.g. with viewports
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102 * note that previous items in stack do not affect the latest area pushed
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103 */
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104 virtual void pushClipArea(const Rect& cliparea, bool clear=true) = 0;
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105
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106 /** Pops clip area from clip stack
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107 * @see pushClipArea
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108 */
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109 virtual void popClipArea() = 0;
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110
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111 /** Gets the current clip area
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112 * @see pushClipArea
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113 */
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114 virtual const Rect& getClipArea() const = 0;
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115
0
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116 /** Saves the image using given filename
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117 */
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118 virtual void saveImage(const std::string& filename) = 0;
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119
0
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120 /** Enable or disable the alpha 'optimizing' code
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121 *
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122 * @param optimize Wether the image shall be analysed for 'fake' alpha images.
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123 * Only implemented by and useful for the SDL backend at the moment.
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124 */
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125 virtual void setAlphaOptimizerEnabled(bool enabled) = 0;
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126
0
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127 /** @see setAlphaOptimizerEnabled
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128 */
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129 virtual bool isAlphaOptimizerEnabled() = 0;
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130 };
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131
0
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132 /** Base Class for Images.
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133 */
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134 class Image : public ResourceClass, public AbstractImage {
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135 public:
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136 /** Constructor.
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137 * @note Takes ownership of the SDL Surface
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138 * @param surface SDL Surface in RGBA format
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139 */
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140 Image(SDL_Surface* surface);
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141
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142 /** Constructor
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143 * @param data Pointer to the imagedata (needs to be in RGBA, 8 bits per channel).
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144 * @param width Width of the image.
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145 * @param height Height of the image.
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146 */
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147 Image(const uint8_t* data, unsigned int width, unsigned int height);
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148
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149 /** Renders itself to the Destination surface at the rectangle rect.
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150 *
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151 * @param rect The position and clipping where to draw this image to.
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152 * @param target Target surface to draw to, e.g. main screen or other image
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153 * @param alpha The alpha value, with which to draw self. opaque by default.
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154 */
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155 virtual void render(const Rect& rect, SDL_Surface* dst, unsigned char alpha = 255) = 0;
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156
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157 /** Renders itself to the main screen at the rectangle rect.
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158 * Convenience function
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159 * @param rect The position and clipping where to draw this image to.
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160 * @param alpha The alpha value, with which to draw self.
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161 */
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162 void render(const Rect& rect, unsigned char alpha = 255);
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163
0
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164 /** Removes underlying SDL_Surface from the image (if exists) and returns this
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165 * @note this effectively causes SDL_Surface not to be freed on destruction
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166 */
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167 SDL_Surface* detachSurface();
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168
0
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169 virtual ~Image();
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170 SDL_Surface* getSurface() { return m_surface; }
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171 unsigned int getWidth() const;
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172 unsigned int getHeight() const;
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173 const Rect& getArea();
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174 void setXShift(int xshift);
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175 inline int getXShift() const {
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176 return m_xshift;
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177 }
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178 void setYShift(int yshift);
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179 inline int getYShift() const {
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180 return m_yshift;
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181 }
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182 void getPixelRGBA(int x, int y, uint8_t* r, uint8_t* g, uint8_t* b, uint8_t* a);
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183 void pushClipArea(const Rect& cliparea, bool clear=true);
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184 void popClipArea();
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185 const Rect& getClipArea() const;
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186 void setAlphaOptimizerEnabled(bool enabled) { m_isalphaoptimized = enabled; }
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187 bool isAlphaOptimizerEnabled() { return m_isalphaoptimized; }
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188
0
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189 protected:
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190 /** Sets given clip area into image
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191 * @see pushClipArea
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192 */
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193 virtual void setClipArea(const Rect& cliparea, bool clear) = 0;
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194 //saves images to png format
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195 virtual void saveAsPng(const std::string& filename, SDL_Surface& surface);
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196 /** Clears any possible clip areas
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197 * @see pushClipArea
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198 */
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199 virtual void clearClipArea();
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200
0
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201 // The SDL Surface used.
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202 SDL_Surface* m_surface;
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203 // The X shift of the Image
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204 int m_xshift;
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205 // The Y shift of the Image
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206 int m_yshift;
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207
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208 class ClipInfo {
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209 public:
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210 Rect r;
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211 bool clearing;
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212 };
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
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213 std::stack<ClipInfo> m_clipstack;
430
ad1f09d954f9 Added the ability to render a vertex on the screen. The vertex is represented by a small square. fixes[t:455]
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214
0
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215 // image area
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216 Rect m_area;
430
ad1f09d954f9 Added the ability to render a vertex on the screen. The vertex is represented by a small square. fixes[t:455]
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217 bool m_isalphaoptimized;
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218
0
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219 private:
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220 void reset(SDL_Surface* surface);
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221 };
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
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222
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223 }
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224
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225 #endif