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annotate engine/core/video/image.h @ 2:e84dccee1bb7

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* add myself to authors * fix missing break in guimanager * when an event occurs over an guichan window the event is marked as consumedByGuichan, but the event is still distributed to all event listeners, those can check via event.isConsumedByGuichan...
author spq@33b003aa-7bff-0310-803a-e67f0ece8222
date Tue, 01 Jul 2008 17:43:35 +0000
parents 4a0efb7baf70
children 90005975cdbb
rev   line source
0
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1 /***************************************************************************
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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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 modify *
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7 * it under the terms of the GNU General Public License as published by *
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8 * the Free Software Foundation; either version 2 of the License, or *
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9 * (at your option) any later version. *
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10 * *
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11 * This program 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 *
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14 * GNU 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 General Public License *
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17 * along with this program; if not, write to the *
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18 * Free Software Foundation, Inc., *
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19 * 51 Franklin St, 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 class Rect;
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44
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45 class AbstractImage {
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46 public:
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47 virtual ~AbstractImage() {}
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48
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49 /** Get the surface used by this image
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50 * @return pointer to used surface
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51 */
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52 virtual SDL_Surface* getSurface() = 0;
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53
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54 /** Returns the @b maximum width occupied by this image.
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55 * This should return the maximum width that could be covered by the
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56 * image.
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57 */
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58 virtual unsigned int getWidth() const = 0;
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59
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60 /** Returns the @b maximum height occupied by this image.
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61 */
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62 virtual unsigned int getHeight() const = 0;
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63
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64 /** Gets the area of the image
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65 * @return Image area in rect
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66 */
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67 virtual const Rect& getArea() = 0;
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68
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69 /** Writes pixel to given position. Returns true, if pixel was written (not out of bounds)
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70 */
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71 virtual bool putPixel(int x, int y, int r, int g, int b) = 0;
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72
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73 /** Draws line between given points with given RGBA
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74 */
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75 virtual void drawLine(const Point& p1, const Point& p2, int r, int g, int b) = 0;
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76
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77 /** Draws quad between given points with given RGBA
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78 */
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79 virtual void drawQuad(const Point& p1, const Point& p2, const Point& p3, const Point& p4, int r, int g, int b) = 0;
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80
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81 /** Returns pixel RGBA values from given position
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82 */
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83 virtual void getPixelRGBA(int x, int y, uint8_t* r, uint8_t* g, uint8_t* b, uint8_t* a) = 0;
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84
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85 /** Pushes clip area to clip stack
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86 * Clip areas define which area is drawn on screen. Usable e.g. with viewports
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87 * note that previous items in stack do not affect the latest area pushed
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88 */
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89 virtual void pushClipArea(const Rect& cliparea, bool clear=true) = 0;
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90
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91 /** Pops clip area from clip stack
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92 * @see pushClipArea
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93 */
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94 virtual void popClipArea() = 0;
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95
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96 /** Gets the current clip area
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97 * @see pushClipArea
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98 */
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99 virtual const Rect& getClipArea() const = 0;
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100
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101 /** Saves the image using given filename
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102 */
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103 virtual void saveImage(const std::string& filename) = 0;
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104
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105 /** Enable or disable the alpha 'optimizing' code
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106 *
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107 * @param optimize Wether the image shall be analysed for 'fake' alpha images.
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108 * Only implemented by and useful for the SDL backend at the moment.
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109 */
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110 virtual void setAlphaOptimizerEnabled(bool enabled) = 0;
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111
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112 /** @see setAlphaOptimizerEnabled
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113 */
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114 virtual bool isAlphaOptimizerEnabled() = 0;
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115 };
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116
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117 /** Base Class for Images.
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118 */
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119 class Image : public ResourceClass, public AbstractImage {
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120 public:
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121 /** Constructor.
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122 * @note Takes ownership of the SDL Surface
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123 * @param surface SDL Surface in RGBA format
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124 */
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125 Image(SDL_Surface* surface);
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126
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127 /** Constructor
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128 * @param data Pointer to the imagedata (needs to be in RGBA, 8 bits per channel).
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129 * @param width Width of the image.
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130 * @param height Height of the image.
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131 */
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132 Image(const uint8_t* data, unsigned int width, unsigned int height);
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133
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134 //TODO: fill in these stub! Note that m_location is not properly initialized.
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135 virtual const ResourceLocation& getResourceLocation() { return m_location; }
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136
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137 virtual void setResourceLocation(const ResourceLocation& location) { }
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138 virtual void setResourceFile(const std::string& filename) { }
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139
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140 /** Renders itself to the Destination surface at the rectangle rect.
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141 *
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142 * @param rect The position and clipping where to draw this image to.
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143 * @param target Target surface to draw to, e.g. main screen or other image
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144 * @param alpha The alpha value, with which to draw self. opaque by default.
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145 */
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146 virtual void render(const Rect& rect, SDL_Surface* dst, unsigned char alpha = 255) = 0;
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147
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148 /** Renders itself to the main screen at the rectangle rect.
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149 * Convenience function
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150 * @param rect The position and clipping where to draw this image to.
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151 * @param alpha The alpha value, with which to draw self.
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152 */
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153 void render(const Rect& rect, unsigned char alpha = 255);
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154
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155 /** Removes underlying SDL_Surface from the image (if exists) and returns this
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156 * @note this effectively causes SDL_Surface not to be freed on destruction
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157 */
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158 SDL_Surface* detachSurface();
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159
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160 virtual ~Image();
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161 SDL_Surface* getSurface() { return m_surface; }
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162 unsigned int getWidth() const;
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163 unsigned int getHeight() const;
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164 const Rect& getArea();
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165 void setXShift(int xshift);
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166 inline int getXShift() const {
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167 return m_xshift;
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168 }
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169 void setYShift(int yshift);
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170 inline int getYShift() const {
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171 return m_yshift;
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172 }
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173 void getPixelRGBA(int x, int y, uint8_t* r, uint8_t* g, uint8_t* b, uint8_t* a);
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174 void pushClipArea(const Rect& cliparea, bool clear=true);
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175 void popClipArea();
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176 const Rect& getClipArea() const;
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177 void setAlphaOptimizerEnabled(bool enabled) { m_isalphaoptimized = enabled; }
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178 bool isAlphaOptimizerEnabled() { return m_isalphaoptimized; }
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179
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180 protected:
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181 /** Sets given clip area into image
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182 * @see pushClipArea
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183 */
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184 virtual void setClipArea(const Rect& cliparea, bool clear) = 0;
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185 //saves images to png format
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186 virtual void saveAsPng(const std::string& filename, SDL_Surface& surface);
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187 /** Clears any possible clip areas
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188 * @see pushClipArea
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189 */
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190 virtual void clearClipArea();
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191
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192 ResourceLocation m_location;
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193
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194 // The SDL Surface used.
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195 SDL_Surface* m_surface;
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196 // The X shift of the Image
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197 int m_xshift;
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198 // The Y shift of the Image
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199 int m_yshift;
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200
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201 class ClipInfo {
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202 public:
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203 Rect r;
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204 bool clearing;
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205 };
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206 std::stack<ClipInfo> m_clipstack;
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207
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208 // image area
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209 Rect m_area;
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210 bool m_isalphaoptimized;
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211
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212 private:
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213 void reset(SDL_Surface* surface);
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214 };
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215
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216 }
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217
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218 #endif