summaryrefslogtreecommitdiff
path: root/src/resources/image.cpp
blob: d9d2a8a01064072a2126810381549fe7171816c5 (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
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
/*
 *  The ManaPlus Client
 *  Copyright (C) 2004-2009  The Mana World Development Team
 *  Copyright (C) 2009-2010  The Mana Developers
 *  Copyright (C) 2011-2014  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/>.
 */

#include "resources/image.h"

#include "resources/resourcemanager.h"

#include "logger.h"

#include "resources/imagehelper.h"
#include "resources/openglimagehelper.h"
#include "resources/sdlimagehelper.h"
#include "resources/subimage.h"

#include "utils/sdlcheckutils.h"

#ifdef USE_SDL2
#include <SDL2_rotozoom.h>
#else
#include <SDL_rotozoom.h>
#endif

#include "debug.h"

#ifdef USE_SDL2
Image::Image(SDL_Texture *restrict const image,
             const int width, const int height) :
    Resource(),
#ifdef USE_OPENGL
    mGLImage(0),
    mTexWidth(0),
    mTexHeight(0),
#endif
    mBounds(),
    mAlpha(1.0F),
    mSDLSurface(nullptr),
    mTexture(image),
    mAlphaChannel(nullptr),
    mAlphaCache(),
    mLoaded(false),
    mHasAlphaChannel(false),
    mUseAlphaCache(false),
    mIsAlphaVisible(true),
    mIsAlphaCalculated(false)
{
#ifdef DEBUG_IMAGES
    logger->log("created image: %p", this);
#endif

    mBounds.x = 0;
    mBounds.y = 0;

    if (mTexture)
    {
        mBounds.w = static_cast<uint16_t>(width);
        mBounds.h = static_cast<uint16_t>(height);

        mLoaded = true;
    }
    else
    {
        logger->log("Image::Image(SDL_Texture *const image):"
            " Couldn't load invalid Surface!");
        mBounds.w = 0;
        mBounds.h = 0;
    }
}
#endif

Image::Image(SDL_Surface *restrict const image, const bool hasAlphaChannel0,
             uint8_t *restrict const alphaChannel) :
    Resource(),
#ifdef USE_OPENGL
    mGLImage(0),
    mTexWidth(0),
    mTexHeight(0),
#endif
    mBounds(),
    mAlpha(1.0F),
    mSDLSurface(image),
#ifdef USE_SDL2
    mTexture(nullptr),
#endif
    mAlphaChannel(alphaChannel),
    mAlphaCache(),
    mLoaded(false),
    mHasAlphaChannel(hasAlphaChannel0),
    mUseAlphaCache(SDLImageHelper::mEnableAlphaCache),
    mIsAlphaVisible(hasAlphaChannel0),
    mIsAlphaCalculated(false)
{
#ifdef DEBUG_IMAGES
    logger->log("created image: %p", static_cast<void*>(this));
#endif

    mBounds.x = 0;
    mBounds.y = 0;

    if (mSDLSurface)
    {
        mBounds.w = static_cast<uint16_t>(mSDLSurface->w);
        mBounds.h = static_cast<uint16_t>(mSDLSurface->h);

        mLoaded = true;
    }
    else
    {
        logger->log(
          "Image::Image(SDL_Surface*): Couldn't load invalid Surface!");
        mBounds.w = 0;
        mBounds.h = 0;
    }
}

#ifdef USE_OPENGL
Image::Image(const GLuint glimage, const int width, const int height,
             const int texWidth, const int texHeight) :
    Resource(),
    mGLImage(glimage),
    mTexWidth(texWidth),
    mTexHeight(texHeight),
    mBounds(),
    mAlpha(1.0F),
    mSDLSurface(nullptr),
#ifdef USE_SDL2
    mTexture(nullptr),
#endif
    mAlphaChannel(nullptr),
    mAlphaCache(),
    mLoaded(false),
    mHasAlphaChannel(true),
    mUseAlphaCache(false),
    mIsAlphaVisible(true),
    mIsAlphaCalculated(false)
{
#ifdef DEBUG_IMAGES
    logger->log("created image: %p", static_cast<void*>(this));
#endif

    mBounds.x = 0;
    mBounds.y = 0;
    mBounds.w = static_cast<uint16_t>(width);
    mBounds.h = static_cast<uint16_t>(height);

    if (mGLImage)
    {
        mLoaded = true;
    }
    else
    {
        logger->log("Image::Image(GLuint*, ...):"
            " Couldn't load invalid Surface!");
    }
}
#endif

Image::~Image()
{
#ifdef DEBUG_IMAGES
    logger->log("delete image: %p", static_cast<void*>(this));
    logger->log("  %s, %s", mIdPath.c_str(), mSource.c_str());
#endif
    unload();
}

void Image::SDLCleanCache()
{
    ResourceManager *const resman = ResourceManager::getInstance();

    for (std::map<float, SDL_Surface*>::iterator
         i = mAlphaCache.begin(), i_end = mAlphaCache.end();
         i != i_end; ++i)
    {
        if (mSDLSurface != i->second)
            resman->scheduleDelete(i->second);
        i->second = nullptr;
    }
    mAlphaCache.clear();
}

void Image::unload()
{
    mLoaded = false;

    if (mSDLSurface)
    {
        SDLCleanCache();
        // Free the image surface.
        MSDL_FreeSurface(mSDLSurface);
        mSDLSurface = nullptr;

        delete [] mAlphaChannel;
        mAlphaChannel = nullptr;
    }
#ifdef USE_SDL2
    if (mTexture)
    {
        SDL_DestroyTexture(mTexture);
        mTexture = nullptr;
    }
#endif

#ifdef USE_OPENGL
    if (mGLImage)
    {
        glDeleteTextures(1, &mGLImage);
        mGLImage = 0;
#ifdef DEBUG_OPENGL_LEAKS
        if (textures_count > 0)
            textures_count --;
#endif
    }
#endif
}

bool Image::hasAlphaChannel() const
{
    if (mLoaded)
        return mHasAlphaChannel;

#ifdef USE_OPENGL
    if (OpenGLImageHelper::mUseOpenGL != RENDER_SOFTWARE)
        return true;
#endif

    return false;
}

SDL_Surface *Image::getByAlpha(const float alpha)
{
    const std::map<float, SDL_Surface*>::const_iterator
        it = mAlphaCache.find(alpha);
    if (it != mAlphaCache.end())
        return (*it).second;
    return nullptr;
}

void Image::setAlpha(const float alpha)
{
    if (mAlpha == alpha || !ImageHelper::mEnableAlpha)
        return;

    if (alpha < 0.0F || alpha > 1.0F)
        return;

    if (mSDLSurface)
    {
        if (mUseAlphaCache)
        {
            SDL_Surface *surface = getByAlpha(mAlpha);
            if (!surface)
            {
                if (mAlphaCache.size() > 100)
                {
#ifdef DEBUG_ALPHA_CACHE
                    logger->log("cleanCache");
                    for (std::map<float, SDL_Surface*>::const_iterator
                         i = mAlphaCache.begin(), i_end = mAlphaCache.end();
                         i != i_end; ++i)
                    {
                        logger->log("alpha: " + toString(i->first));
                    }
#endif
                    SDLCleanCache();
                }
                surface = mSDLSurface;
                if (surface)
                    mAlphaCache[mAlpha] = surface;
            }
            else
            {
                logger->log("cache bug");
            }

            surface = getByAlpha(alpha);
            if (surface)
            {
                if (mSDLSurface == surface)
                    logger->log("bug");
                mAlphaCache.erase(alpha);
                mSDLSurface = surface;
                mAlpha = alpha;
                return;
            }
            else
            {
                mSDLSurface = SDLImageHelper::SDLDuplicateSurface(mSDLSurface);
            }
        }

        mAlpha = alpha;

        if (!mHasAlphaChannel)
        {
#ifdef USE_SDL2
            SDL_SetSurfaceAlphaMod(mSDLSurface,
                static_cast<unsigned char>(255 * mAlpha));
#else
            // Set the alpha value this image is drawn at
            SDL_SetAlpha(mSDLSurface, SDL_SRCALPHA,
                static_cast<unsigned char>(255 * mAlpha));
#endif
        }
        else
        {
            if (SDL_MUSTLOCK(mSDLSurface))
                SDL_LockSurface(mSDLSurface);

            const int bx = mBounds.x;
            const int by = mBounds.y;
            const int bw = mBounds.w;
            const int bh = mBounds.h;
            const int bxw = bx + bw;
            const int sw = mSDLSurface->w;
            const int maxHeight = std::min(by + bh, mSDLSurface->h);
            const int maxWidth = std::min(bxw, sw);
            const int i1 = by * sw + bx;
            const SDL_PixelFormat * const fmt = mSDLSurface->format;
            const uint32_t amask = fmt->Amask;
            const uint32_t invMask = ~fmt->Amask;
            const uint8_t aloss = fmt->Aloss;
            const uint8_t ashift = fmt->Ashift;

            if (!bx && bxw == sw)
            {
                const int i2 = (maxHeight - 1) * sw + maxWidth - 1;
                for (int i = i1; i <= i2; i++)
                {
                    const uint8_t sourceAlpha = mAlphaChannel[i];
                    if (sourceAlpha > 0)
                    {
                        const uint8_t a = static_cast<uint8_t>(
                            static_cast<float>(sourceAlpha) * mAlpha);

                        uint32_t c = (static_cast<uint32_t*>(
                            mSDLSurface->pixels))[i];
                        c &= invMask;
                        c |= ((a >> aloss) << ashift & amask);
                        (static_cast<uint32_t*>(mSDLSurface->pixels))[i] = c;
                    }
                }
            }
            else
            {
                for (int y = by; y < maxHeight; y ++)
                {
                    const int idx = y * sw;
                    const int x1 = idx + bx;
                    const int x2 = idx + maxWidth;
                    for (int i = x1; i < x2; i ++)
                    {
                        const uint8_t sourceAlpha = mAlphaChannel[i];
                        if (sourceAlpha > 0)
                        {
                            const uint8_t a = static_cast<uint8_t>(
                                static_cast<float>(sourceAlpha) * mAlpha);

                            uint32_t c = (static_cast<uint32_t*>(
                                mSDLSurface->pixels))[i];
                            c &= invMask;
                            c |= ((a >> aloss) << ashift & amask);
                            (static_cast<uint32_t*>(
                                mSDLSurface->pixels))[i] = c;
                        }
                    }
                }
            }

            if (SDL_MUSTLOCK(mSDLSurface))
                SDL_UnlockSurface(mSDLSurface);
        }
    }
#ifdef USE_SDL2
    else if (mTexture)
    {
        mAlpha = alpha;
        SDL_SetTextureAlphaMod(mTexture,
            static_cast<unsigned char>(255 * mAlpha));
    }
#endif
    else
    {
        mAlpha = alpha;
    }
}

Image* Image::SDLgetScaledImage(const int width, const int height) const
{
    // No scaling on incorrect new values.
    if (width == 0 || height == 0)
        return nullptr;

    // No scaling when there is ... no different given size ...
    if (width == mBounds.w && height == mBounds.h)
        return nullptr;

    Image* scaledImage = nullptr;

    if (mSDLSurface)
    {
        SDL_Surface *const scaledSurface = zoomSurface(mSDLSurface,
                    static_cast<double>(width) / mBounds.w,
                    static_cast<double>(height) / mBounds.h,
                    1);

        // The load function takes care of the SDL<->OpenGL implementation
        // and about freeing the given SDL_surface*.
        if (scaledSurface)
        {
            scaledImage = imageHelper->load(scaledSurface);
            MSDL_FreeSurface(scaledSurface);
        }
    }
    return scaledImage;
}

Image *Image::getSubImage(const int x, const int y,
                          const int width, const int height)
{
    // Create a new clipped sub-image
#ifdef USE_OPENGL
    const RenderType mode = OpenGLImageHelper::mUseOpenGL;
    if (mode == RENDER_NORMAL_OPENGL
        || mode == RENDER_SAFE_OPENGL
        || mode == RENDER_GLES_OPENGL
        || mode == RENDER_MODERN_OPENGL)
    {
        return new SubImage(this, mGLImage, x, y, width, height,
                            mTexWidth, mTexHeight);
    }
#endif

#ifdef USE_SDL2
#ifndef USE_OPENGL
    const RenderType mode = ImageHelper::mUseOpenGL;
#endif
    if (mode == RENDER_SOFTWARE)
        return new SubImage(this, mSDLSurface, x, y, width, height);
    else
        return new SubImage(this, mTexture, x, y, width, height);
#else
    return new SubImage(this, mSDLSurface, x, y, width, height);
#endif
}

void Image::SDLTerminateAlphaCache()
{
    SDLCleanCache();
    mUseAlphaCache = false;
}