summaryrefslogtreecommitdiff
path: root/src/resources/image.cpp
blob: eb550a3a9cb7da1f19f7d7d0b06c480009c95755 (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
/*
 *  The Mana World
 *  Copyright 2004 The Mana World Development Team
 *
 *  This file is part of The Mana World.
 *
 *  The Mana World 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.
 *
 *  The Mana World 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 The Mana World; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 *  $Id$
 */

#include "../main.h"
#include "../log.h"
#include "image.h"
#include <iostream>
#include <SDL_image.h>

Image::Image(SDL_Surface *image):
    image(image)
{
    // Default to opaque
    alpha = 1.0f;
}

Image::Image(GLuint glimage, int width, int height, int texWidth, int texHeight):
    glimage(glimage),
    width(width),
    height(height),
    texWidth(texWidth),
    texHeight(texHeight)
{
    // Default to opaque
    alpha = 1.0f;
}

Image::~Image()
{
    unload();
}

Image* Image::load(void* buffer, unsigned int bufferSize)
{
    // Load the raw file data from the buffer in an RWops structure
    SDL_RWops *rw = SDL_RWFromMem(buffer, bufferSize);

    // Use SDL_Image to load the raw image data and have it free the data
    SDL_Surface* tmpImage = IMG_Load_RW(rw, 1);

    if (tmpImage == NULL) {
        logger->log("Error, image load failed");
        return NULL;
    }

    // Determine 32-bit masks based on byte order
    Uint32 rmask, gmask, bmask, amask;
#if SDL_BYTEORDER == SDL_BIG_ENDIAN
    rmask = 0xff000000;
    gmask = 0x00ff0000;
    bmask = 0x0000ff00;
    amask = 0x000000ff;
#else
    rmask = 0x000000ff;
    gmask = 0x0000ff00;
    bmask = 0x00ff0000;
    amask = 0xff000000;
#endif

    // Convert the image to a 32 bit software surface for processing
    SDL_Surface *formatImage = SDL_CreateRGBSurface(SDL_SWSURFACE, 0, 0, 32,
            rmask, gmask, bmask, amask);

    if (formatImage == NULL) {
        logger->log("Error, image load failed: not enough memory");
        SDL_FreeSurface(tmpImage);
        return NULL;
    }

    SDL_Surface *image = SDL_ConvertSurface(
            tmpImage, formatImage->format, SDL_SWSURFACE);

    SDL_FreeSurface(formatImage);

    if (image == NULL) {
        logger->log("Error, image load failed: not enough memory");
        return NULL;
    }

    bool hasPink = false;
    bool hasAlpha = false;
    int i;
    Uint32 pink = SDL_MapRGB(image->format, 255, 0, 255);

    // Figure out whether the image has pink pixels
    for (i = 0; i < image->w * image->h; ++i)
    {
        if (((Uint32*)image->pixels)[i] == pink)
        {
            hasPink = true;
            break;
        }
    }

    // Figure out whether the image uses its alpha layer
    for (i = 0; i < image->w * image->h; ++i)
    {
        Uint8 r, g, b, a;
        SDL_GetRGBA(
                ((Uint32*)image->pixels)[i],
                image->format,
                &r, &g, &b, &a);

        if (a != 255)
        {
            hasAlpha = true;
            break;
        }
    }

    SDL_FreeSurface(image);

    if (hasPink && !hasAlpha) {
        SDL_SetColorKey(tmpImage, SDL_SRCCOLORKEY | SDL_RLEACCEL,
                SDL_MapRGB(tmpImage->format, 255, 0, 255));
    } else if (hasAlpha) {
        SDL_SetAlpha(tmpImage, SDL_SRCALPHA | SDL_RLEACCEL, SDL_ALPHA_OPAQUE);
    }

    if (!useOpenGL) {
        // Set color key and alpha blending optins, and convert the surface to the
        // current display format
        SDL_Surface *prevImage = tmpImage;
        if (hasAlpha) {
            image = SDL_DisplayFormatAlpha(tmpImage);
        }
        else {
            image = SDL_DisplayFormat(tmpImage);
        }
        SDL_FreeSurface(prevImage);

        if (image == NULL) {
            logger->log("Error: Image convert failed.");
            return NULL;
        }

        return new Image(image);
    }
#ifdef USE_OPENGL
    else {
        int width = tmpImage->w;
        int height = tmpImage->h;
        int realWidth = 1, realHeight = 1;

        while (realWidth < width && realWidth < 1024) {
            realWidth *= 2;
        }

        while (realHeight < height && realHeight < 1024) {
            realHeight *= 2;
        }

        SDL_SetAlpha(tmpImage, 0, SDL_ALPHA_OPAQUE);
        SDL_Surface *oldImage = tmpImage;
        tmpImage = SDL_CreateRGBSurface(SDL_SWSURFACE, realWidth, realHeight, 32,
                rmask, gmask, bmask, amask);

        if (tmpImage == NULL) {
            logger->log("Error, image convert failed: out of memory");
            return NULL;
        }

        SDL_BlitSurface(oldImage, NULL, tmpImage, NULL);
        SDL_FreeSurface(oldImage);

        GLuint texture;
        glGenTextures(1, &texture);
        logger->log("Binding texture %d (%dx%d)",
                texture, tmpImage->w, tmpImage->h);
        glBindTexture(GL_TEXTURE_2D, texture);

        if (SDL_MUSTLOCK(tmpImage)) {
            SDL_LockSurface(tmpImage);
        }

        glTexImage2D(
                GL_TEXTURE_2D, 0, 4,
                tmpImage->w, tmpImage->h,
                0, GL_RGBA, GL_UNSIGNED_BYTE,
                tmpImage->pixels);

        glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);

        if (SDL_MUSTLOCK(tmpImage)) {
            SDL_UnlockSurface(tmpImage);
        }

        SDL_FreeSurface(tmpImage);

        GLenum error = glGetError();
        if (error)
        {
            std::string errmsg = "Unkown error";
            switch (error)
            {
                case GL_INVALID_ENUM:
                    errmsg = "GL_INVALID_ENUM";
                    break;
                case GL_INVALID_VALUE:
                    errmsg = "GL_INVALID_VALUE";
                    break;
                case GL_INVALID_OPERATION:
                    errmsg = "GL_INVALID_OPERATION";
                    break;
                case GL_STACK_OVERFLOW:
                    errmsg = "GL_STACK_OVERFLOW";
                    break;
                case GL_STACK_UNDERFLOW:
                    errmsg = "GL_STACK_UNDERFLOW";
                    break;
                case GL_OUT_OF_MEMORY:
                    errmsg = "GL_OUT_OF_MEMORY";
                    break;
            }
            logger->log("Error: Image GL import failed: %s", errmsg.c_str());
            return NULL;
        }

        return new Image(texture, width, height, realWidth, realHeight);
    }
#endif

    return NULL;
}

void Image::unload()
{
    // Free the image surface.
    if (!useOpenGL) {
        if (image != NULL) {
            SDL_FreeSurface(image);
            image = NULL;
            loaded = false;
        }
    }
    loaded = false;
}

int Image::getWidth() const
{
    if (!useOpenGL) {
        if (image != NULL) {
            return image->w;
        }
    }
    else {
        return width;
    }
    return 0;
}

int Image::getHeight() const
{
    if (!useOpenGL) {
        if (image != NULL) {
            return image->h;
        }
    }
    else {
        return height;
    }
    return 0;
}

Image *Image::getSubImage(int x, int y, int width, int height)
{
    // Create a new clipped sub-image
    if (useOpenGL) {
        return new SubImage(this, glimage, x, y, width, height, texWidth, texHeight);
    }
    else {
        return new SubImage(this, image, x, y, width, height);
    }
}

bool Image::draw_deprecated(SDL_Surface *screen, int srcX, int srcY, int dstX, int dstY,
        int width, int height)
{
    if (!useOpenGL) {
        // Check that preconditions for blitting are met.
        if (screen == NULL || image == NULL) return false;

        SDL_Rect dstRect;
        SDL_Rect srcRect;
        dstRect.x = dstX; dstRect.y = dstY;
        srcRect.x = srcX; srcRect.y = srcY;
        srcRect.w = width;
        srcRect.h = height;

        if (SDL_BlitSurface(image, &srcRect, screen, &dstRect) < 0) {
            return false;
        }
    }
#ifdef USE_OPENGL
    else {
        // Find OpenGL texture coordinates
        float texX1 = srcX / (float)texWidth;
        float texY1 = srcY / (float)texHeight;
        float texX2 = (srcX + width) / (float)texWidth;
        float texY2 = (srcY + height) / (float)texHeight;

        glColor4f(1.0f, 1.0f, 1.0f, alpha);
        glBindTexture(GL_TEXTURE_2D, glimage);
        glEnable(GL_TEXTURE_2D);
        glEnable(GL_BLEND);

        // Draw a textured quad -- the image
        glBegin(GL_QUADS);
        glTexCoord2f(texX1, texY1);
        glVertex3i(dstX, dstY, 0);

        glTexCoord2f(texX2, texY1);
        glVertex3i(dstX + width, dstY, 0);

        glTexCoord2f(texX2, texY2);
        glVertex3i(dstX + width, dstY + height, 0);

        glTexCoord2f(texX1, texY2);
        glVertex3i(dstX, dstY + height, 0);
        glEnd();

        glDisable(GL_TEXTURE_2D);
        glDisable(GL_BLEND);
        glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
    }
#endif
    return true;
}

bool Image::draw_deprecated(SDL_Surface *screen, int x, int y)
{
    return draw_deprecated(screen, 0, 0, x, y, getWidth(), getHeight());
}

void Image::setAlpha(float a)
{
    alpha = a;

    if (!useOpenGL) {
        // Set the alpha value this image is drawn at
        SDL_SetAlpha(image, SDL_SRCALPHA | SDL_RLEACCEL, (int)(255 * alpha));
    }
}

float Image::getAlpha()
{
    return alpha;
}

//============================================================================
// SubImage Class
//============================================================================

SubImage::SubImage(Image *parent, SDL_Surface *image,
        int x, int y, int width, int height):
    Image(image), parent(parent)
{
    parent->incRef();

    // Set up the rectangle.
    rect.x = x;
    rect.y = y;
    rect.w = width;
    rect.h = height;
}

//SubImage::SubImage((GLuint*)Image *parent, GLuint glimage,
SubImage::SubImage(Image *parent, GLuint image,
        int x, int y, int width, int height, int texWidth, int texHeight):
    Image(image, width, height, texWidth, texHeight), parent(parent)
{
    parent->incRef();

    // Set up the rectangle.
    rect.x = x;
    rect.y = y;
    rect.w = width;
    rect.h = height;
}

SubImage::~SubImage()
{
    if (!useOpenGL) {
        image = NULL;
    }
    parent->decRef();
}

int SubImage::getWidth() const
{
    return rect.w;
}

int SubImage::getHeight() const
{
    return rect.h;
}

Image *SubImage::getSubImage(int x, int y, int w, int h)
{
    return NULL;
}

bool SubImage::draw_deprecated(SDL_Surface *screen, int srcX, int srcY,
        int dstX, int dstY, int width, int height)
{
    return Image::draw_deprecated(screen, rect.x + srcX, rect.y + srcY,
            dstX, dstY, width, height);
}