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annotate engine/core/video/image.h @ 622:c0c3f64bfc2d

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* Templatized Rect to extend it's functionality beyond integers * Added some typedefs: Rect, FloatRect, DoubleRect * Removed the Rect class from the fife_math extensions * Modified the shooter demo to use the FIFE rect template class
author prock@33b003aa-7bff-0310-803a-e67f0ece8222
date Fri, 01 Oct 2010 15:32:55 +0000
parents 47b49b9b0c0a
children f3457443c95f
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. *
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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. *
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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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43
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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
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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
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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 quad between given points with given RGBA
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81 */
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82 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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83
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84 /** Draws a quad that represents a vertex with given RGBA
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85 */
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86 virtual void drawVertex(const Point& p, const uint8_t size, int r, int g, int b, int a = 255) = 0;
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87
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88 /** Returns pixel RGBA values from given position
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89 */
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90 virtual void getPixelRGBA(int x, int y, uint8_t* r, uint8_t* g, uint8_t* b, uint8_t* a) = 0;
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91
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92 /** Pushes clip area to clip stack
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93 * Clip areas define which area is drawn on screen. Usable e.g. with viewports
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94 * note that previous items in stack do not affect the latest area pushed
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95 */
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96 virtual void pushClipArea(const Rect& cliparea, bool clear=true) = 0;
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97
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98 /** Pops clip area from clip stack
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99 * @see pushClipArea
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100 */
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101 virtual void popClipArea() = 0;
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102
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103 /** Gets the current clip area
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104 * @see pushClipArea
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105 */
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106 virtual const Rect& getClipArea() const = 0;
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107
0
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108 /** Saves the image using given filename
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109 */
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110 virtual void saveImage(const std::string& filename) = 0;
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111
0
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112 /** Enable or disable the alpha 'optimizing' code
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113 *
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114 * @param optimize Wether the image shall be analysed for 'fake' alpha images.
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115 * Only implemented by and useful for the SDL backend at the moment.
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116 */
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117 virtual void setAlphaOptimizerEnabled(bool enabled) = 0;
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118
0
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119 /** @see setAlphaOptimizerEnabled
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120 */
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121 virtual bool isAlphaOptimizerEnabled() = 0;
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122 };
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123
0
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124 /** Base Class for Images.
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125 */
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126 class Image : public ResourceClass, public AbstractImage {
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127 public:
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128 /** Constructor.
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129 * @note Takes ownership of the SDL Surface
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130 * @param surface SDL Surface in RGBA format
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131 */
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132 Image(SDL_Surface* surface);
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133
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134 /** Constructor
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135 * @param data Pointer to the imagedata (needs to be in RGBA, 8 bits per channel).
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136 * @param width Width of the image.
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137 * @param height Height of the image.
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138 */
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139 Image(const uint8_t* data, unsigned int width, unsigned int height);
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140
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141 /** Renders itself to the Destination surface at the rectangle rect.
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142 *
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143 * @param rect The position and clipping where to draw this image to.
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144 * @param target Target surface to draw to, e.g. main screen or other image
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145 * @param alpha The alpha value, with which to draw self. opaque by default.
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146 */
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147 virtual void render(const Rect& rect, SDL_Surface* dst, unsigned char alpha = 255) = 0;
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148
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149 /** Renders itself to the main screen at the rectangle rect.
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150 * Convenience function
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151 * @param rect The position and clipping where to draw this image to.
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152 * @param alpha The alpha value, with which to draw self.
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153 */
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154 void render(const Rect& rect, unsigned char alpha = 255);
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155
0
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156 /** Removes underlying SDL_Surface from the image (if exists) and returns this
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157 * @note this effectively causes SDL_Surface not to be freed on destruction
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158 */
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159 SDL_Surface* detachSurface();
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160
0
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161 virtual ~Image();
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162 SDL_Surface* getSurface() { return m_surface; }
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163 unsigned int getWidth() const;
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164 unsigned int getHeight() const;
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165 const Rect& getArea();
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166 void setXShift(int xshift);
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167 inline int getXShift() const {
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168 return m_xshift;
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169 }
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170 void setYShift(int yshift);
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171 inline int getYShift() const {
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172 return m_yshift;
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173 }
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174 void getPixelRGBA(int x, int y, uint8_t* r, uint8_t* g, uint8_t* b, uint8_t* a);
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175 void pushClipArea(const Rect& cliparea, bool clear=true);
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176 void popClipArea();
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177 const Rect& getClipArea() const;
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178 void setAlphaOptimizerEnabled(bool enabled) { m_isalphaoptimized = enabled; }
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179 bool isAlphaOptimizerEnabled() { return m_isalphaoptimized; }
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180
0
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181 protected:
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182 /** Sets given clip area into image
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183 * @see pushClipArea
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184 */
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185 virtual void setClipArea(const Rect& cliparea, bool clear) = 0;
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186 //saves images to png format
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187 virtual void saveAsPng(const std::string& filename, SDL_Surface& surface);
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188 /** Clears any possible clip areas
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189 * @see pushClipArea
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190 */
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191 virtual void clearClipArea();
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192
0
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193 // The SDL Surface used.
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194 SDL_Surface* m_surface;
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195 // The X shift of the Image
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196 int m_xshift;
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197 // The Y shift of the Image
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198 int m_yshift;
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199
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200 class ClipInfo {
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201 public:
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202 Rect r;
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203 bool clearing;
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204 };
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205 std::stack<ClipInfo> m_clipstack;
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206
0
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207 // image area
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208 Rect m_area;
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209 bool m_isalphaoptimized;
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210
0
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211 private:
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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212 void reset(SDL_Surface* surface);
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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213 };
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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214
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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215 }
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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216
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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217 #endif