summaryrefslogtreecommitdiff
path: root/src/resources/image.h
blob: ee341af75a236c626aca26484dd098d053a29759 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
/*
 *  The ManaPlus Client
 *  Copyright (C) 2004-2009  The Mana World Development Team
 *  Copyright (C) 2009-2010  The Mana Developers
 *  Copyright (C) 2011  The ManaPlus Developers
 *
 *  This file is part of The ManaPlus Client.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef IMAGE_H
#define IMAGE_H

#include "main.h"

#include "resources/resource.h"

#include <SDL.h>

#ifdef USE_OPENGL

/* The definition of OpenGL extensions by SDL is giving problems with recent
 * gl.h headers, since they also include these definitions. As we're not using
 * extensions anyway it's safe to just disable the SDL version.
 */
#define NO_SDL_GLEXT

#include <SDL_opengl.h>
#endif

#include <map>

class Dye;

struct Position;

/**
 * Defines a class for loading and storing images.
 */
class Image : public Resource
{
    friend class CompoundSprite;
    friend class Graphics;
#ifdef USE_OPENGL
    friend class OpenGLGraphics;
    friend class OpenGL1Graphics;
#endif

    public:
        /**
         * Destructor.
         */
        virtual ~Image();

        /**
         * Loads an image from a buffer in memory.
         *
         * @param buffer     The memory buffer containing the image data.
         * @param bufferSize The size of the memory buffer in bytes.
         *
         * @return <code>NULL</code> if an error occurred, a valid pointer
         *         otherwise.
         */
        static Resource *load(void *buffer, unsigned bufferSize);

        /**
         * Loads an image from a buffer in memory and recolors it.
         *
         * @param buffer     The memory buffer containing the image data.
         * @param bufferSize The size of the memory buffer in bytes.
         * @param dye        The dye used to recolor the image.
         *
         * @return <code>NULL</code> if an error occurred, a valid pointer
         *         otherwise.
         */
        static Resource *load(void *buffer, unsigned bufferSize,
                              Dye const &dye);

        /**
         * Loads an image from an SDL surface.
         */
        static Image *load(SDL_Surface *);

        static SDL_Surface* convertTo32Bit(SDL_Surface* tmpImage);

        /**
         * Frees the resources created by SDL.
         */
        virtual void unload();

        /**
         * Tells is the image is loaded
         */
        bool isLoaded()
        { return mLoaded; }

        /**
         * Returns the width of the image.
         */
        inline int getWidth() const     // was virtual
        { return mBounds.w; }

        /**
         * Returns the height of the image.
         */
        inline int getHeight() const     // was virtual
        { return mBounds.h; }

        /**
         * Tells if the image was loaded using OpenGL or SDL
         * @return true if OpenGL, false if SDL.
         */
        int useOpenGL() const;

        /**
         * Tells if the image has got an alpha channel
         * @return true if it's true, false otherwise.
         */
        bool hasAlphaChannel();

        /**
         * Sets the alpha value of this image.
         */
        virtual void setAlpha(float alpha);

        /**
         * Returns the alpha value of this image.
         */
        float getAlpha() const
        { return mAlpha; }

        /**
         * Creates a new image with the desired clipping rectangle.
         *
         * @return <code>NULL</code> if creation failed and a valid
         *         object otherwise.
         */
        virtual Image *getSubImage(int x, int y, int width, int height);


        // SDL only public functions

        /**
         * Gets an scaled instance of an image.
         *
         * @param width The desired width of the scaled image.
         * @param height The desired height of the scaled image.
         *
         * @return A new Image* object.
         */
        Image* SDLgetScaledImage(int width, int height);

        /**
         * Merges two image SDL_Surfaces together. This is for SDL use only, as
         * reducing the number of surfaces that SDL has to render can cut down
         * on the number of blit operations necessary, which in turn can help
         * improve overall framerates. Don't use unless you are using it to
         * reduce the number of overall layers that need to be drawn through SDL.
         */
        Image *SDLmerge(Image *image, int x, int y);

        /**
         * Get the alpha Channel of a SDL surface.
         */
        Uint8 *SDLgetAlphaChannel() const
        { return mAlphaChannel; }

        SDL_Surface* SDLDuplicateSurface(SDL_Surface* tmpImage);

        void SDLCleanCache();

        void SDLTerminateAlphaCache();

        static void SDLSetEnableAlphaCache(bool n)
        { mEnableAlphaCache = n; }

        static void setEnableAlpha(bool n)
        { mEnableAlpha = n; }

#ifdef USE_OPENGL

        // OpenGL only public functions

        /**
         * Sets the target image format. Use <code>false</code> for SDL and
         * <code>true</code> for OpenGL.
         */
        static void setLoadAsOpenGL(int useOpenGL);

        static int getLoadAsOpenGL()
        { return mUseOpenGL; }

        int getTextureWidth() const
        { return mTexWidth; }

        int getTextureHeight() const
        { return mTexHeight; }

        bool isHasAlphaChannel()
        { return mHasAlphaChannel; }

        bool isAlphaVisible()
        { return mIsAlphaVisible; }

        void setAlphaVisible(bool b)
        { mIsAlphaVisible = b; }

        static int getTextureType()
        { return mTextureType; }

        static int mTextureType;
#endif

        SDL_Rect mBounds;

    protected:

      // -----------------------
      // Generic protected members
      // -----------------------

        bool mLoaded;
        float mAlpha;
        bool mHasAlphaChannel;

      // -----------------------
      // SDL protected members
      // -----------------------

        /** SDL Constructor */
        Image(SDL_Surface *image, bool hasAlphaChannel = false,
              Uint8 *alphaChannel = NULL);

        /** SDL_Surface to SDL_Surface Image loader */
        static Image *_SDLload(SDL_Surface *tmpImage);

        SDL_Surface *getByAlpha(float alpha);

        SDL_Surface *mSDLSurface;

        /** Alpha Channel pointer used for 32bit based SDL surfaces */
        Uint8 *mAlphaChannel;

        std::map<float, SDL_Surface*> mAlphaCache;

        bool mUseAlphaCache;
        bool mIsAlphaVisible;

        static bool mEnableAlphaCache;
        static bool mEnableAlpha;

        // -----------------------
        // OpenGL protected members
        // -----------------------
#ifdef USE_OPENGL
        /**
         * OpenGL Constructor.
         */
        Image(GLuint glimage, int width, int height,
              int texWidth, int texHeight);

        /**
         * Returns the first power of two equal or bigger than the input.
         */
        static int powerOfTwo(int input);

        static Image *_GLload(SDL_Surface *tmpImage);

        GLuint mGLImage;
        int mTexWidth, mTexHeight;

        static int mUseOpenGL;
        static int mTextureSize;
#endif
};

/**
 * A clipped version of a larger image.
 */
class SubImage : public Image
{
    public:
        /**
         * Constructor.
         */
        SubImage(Image *parent, SDL_Surface *image,
                 int x, int y, int width, int height);
#ifdef USE_OPENGL
        SubImage(Image *parent, GLuint image, int x, int y,
                 int width, int height, int texWidth, int textHeight);
#endif

        /**
         * Destructor.
         */
        ~SubImage();

        /**
         * Creates a new image with the desired clipping rectangle.
         *
         * @return <code>NULL</code> if creation failed and a valid
         *         image otherwise.
         */
        Image *getSubImage(int x, int y, int width, int height);

        SDL_Rect mInternalBounds;

    private:
        Image *mParent;
};

#endif