summaryrefslogtreecommitdiff
path: root/src/resources/sdlimagehelper.cpp
blob: fecd11482350e07954c13a45c43e5f1a031435fa (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
/*
 *  The ManaPlus Client
 *  Copyright (C) 2004-2009  The Mana World Development Team
 *  Copyright (C) 2009-2010  The Mana Developers
 *  Copyright (C) 2011-2017  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 USE_SDL2

#include "resources/sdlimagehelper.h"

#include "resources/dye/dye.h"
#include "resources/dye/dyepalette.h"

#include "resources/image/image.h"

#include "utils/checkutils.h"
#include "utils/sdlcheckutils.h"

PRAGMA48(GCC diagnostic push)
PRAGMA48(GCC diagnostic ignored "-Wshadow")
#include <SDL_image.h>
PRAGMA48(GCC diagnostic pop)

#include "localconsts.h"

#if SDL_BYTEORDER == SDL_LIL_ENDIAN
#include "resources/sdlgfxblitfunc.h"
#else  // SDL_BYTEORDER == SDL_LIL_ENDIAN
PRAGMA48(GCC diagnostic push)
PRAGMA48(GCC diagnostic ignored "-Wshadow")
#include <SDL_gfxBlitFunc.h>
PRAGMA48(GCC diagnostic pop)
#endif  // SDL_BYTEORDER == SDL_LIL_ENDIAN

#ifndef SDL_BIG_ENDIAN
#error missing SDL_endian.h
#endif  // SDL_BYTEORDER

#include "debug.h"

bool SDLImageHelper::mEnableAlphaCache = false;

Image *SDLImageHelper::load(SDL_RWops *const rw, Dye const &dye)
{
    SDL_Surface *const tmpImage = loadPng(rw);
    if (tmpImage == nullptr)
    {
        reportAlways("Error, image load failed: %s",
            SDL_GetError());
        return nullptr;
    }

    SDL_PixelFormat rgba;
    rgba.palette = nullptr;
    rgba.BitsPerPixel = 32;
    rgba.BytesPerPixel = 4;
    rgba.colorkey = 0;
    rgba.alpha = 255;
    rgba.Rloss = 0;
    rgba.Gloss = 0;
    rgba.Bloss = 0;
    rgba.Aloss = 0;

#if SDL_BYTEORDER == SDL_BIG_ENDIAN
    rgba.Rmask = 0x000000FF;
    rgba.Rshift = 24;
    rgba.Gmask = 0x0000FF00;
    rgba.Gshift = 16;
    rgba.Bmask = 0x00FF0000;
    rgba.Bshift = 8;
    rgba.Amask = 0xFF000000;
    rgba.Ashift = 0;
#else  // SDL_BYTEORDER == SDL_BIG_ENDIAN

    rgba.Rmask = 0xFF000000;
    rgba.Rshift = 0;
    rgba.Gmask = 0x00FF0000;
    rgba.Gshift = 8;
    rgba.Bmask = 0x0000FF00;
    rgba.Bshift = 16;
    rgba.Amask = 0x000000FF;
    rgba.Ashift = 24;
#endif  // SDL_BYTEORDER == SDL_BIG_ENDIAN

    // +++ here is bug on ppc64le
    SDL_Surface *const surf = MSDL_ConvertSurface(
        tmpImage, &rgba, SDL_SWSURFACE);

    MSDL_FreeSurface(tmpImage);
    if (surf == nullptr)
        return nullptr;

    uint32_t *pixels = static_cast<uint32_t *>(surf->pixels);
    const int type = dye.getType();

    switch (type)
    {
        case 1:
        {
            const DyePalette *const pal = dye.getSPalete();
            if (pal != nullptr)
                DYEPALETTEP(pal, SColor)(pixels, surf->w * surf->h);
            break;
        }
        case 2:
        {
            const DyePalette *const pal = dye.getAPalete();
            if (pal != nullptr)
                DYEPALETTEP(pal, AColor)(pixels, surf->w * surf->h);
            break;
        }
        case 0:
        default:
        {
            dye.normalDye(pixels, surf->w * surf->h);
            break;
        }
    }

    Image *const image = loadSurface(surf);
    MSDL_FreeSurface(surf);
    return image;
}

Image *SDLImageHelper::loadSurface(SDL_Surface *const tmpImage)
{
    return _SDLload(tmpImage);
}

Image *SDLImageHelper::createTextSurface(SDL_Surface *const tmpImage,
                                         const int width A_UNUSED,
                                         const int height A_UNUSED,
                                         const float alpha)
{
    if (tmpImage == nullptr)
        return nullptr;

    bool hasAlpha = false;
    const size_t sz = tmpImage->w * tmpImage->h;

    // The alpha channel to be filled with alpha values
    uint8_t *alphaChannel = new uint8_t[sz];

    const SDL_PixelFormat *const fmt = tmpImage->format;
    if (fmt->Amask != 0u)
    {
        for (size_t i = 0; i < sz; ++ i)
        {
            uint32_t c = (static_cast<uint32_t*>(tmpImage->pixels))[i];

            const unsigned v = (c & fmt->Amask) >> fmt->Ashift;
            const uint8_t a = static_cast<uint8_t>((v << fmt->Aloss)
                + (v >> (8 - (fmt->Aloss << 1))));

            const uint8_t a2 = CAST_U8(
                static_cast<float>(a) * alpha);

            c &= ~fmt->Amask;
            c |= ((a2 >> fmt->Aloss) << fmt->Ashift & fmt->Amask);
            (static_cast<uint32_t*>(tmpImage->pixels))[i] = c;

            if (a != 255)
                hasAlpha = true;

            alphaChannel[i] = a;
        }
    }

    SDL_Surface *image;

    // Convert the surface to the current display format
    if (hasAlpha)
    {
        image = MSDL_DisplayFormatAlpha(tmpImage);
    }
    else
    {
        image = MSDL_DisplayFormat(tmpImage);

        // We also delete the alpha channel since
        // it's not used.
        delete [] alphaChannel;
        alphaChannel = nullptr;
    }

    if (image == nullptr)
    {
        reportAlways("Error: Image convert failed.");
        delete [] alphaChannel;
        return nullptr;
    }

    Image *const img = new Image(image, hasAlpha, alphaChannel);
    img->mAlpha = alpha;
    return img;
}

SDL_Surface* SDLImageHelper::SDLDuplicateSurface(SDL_Surface *const tmpImage)
{
    if ((tmpImage == nullptr) || (tmpImage->format == nullptr))
        return nullptr;

    return MSDL_ConvertSurface(tmpImage, tmpImage->format, SDL_SWSURFACE);
}

Image *SDLImageHelper::_SDLload(SDL_Surface *tmpImage)
{
    if (tmpImage == nullptr)
        return nullptr;

    bool hasAlpha = false;
    bool converted = false;

    if (tmpImage->format->BitsPerPixel != 32)
    {
        reportAlways("Non 32 bit image detected");
        tmpImage = convertTo32Bit(tmpImage);

        if (tmpImage == nullptr)
            return nullptr;
        converted = true;
    }

    const size_t sz = tmpImage->w * tmpImage->h;

    // The alpha channel to be filled with alpha values
    uint8_t *alphaChannel = new uint8_t[sz];

    // Figure out whether the image uses its alpha layer
    if (tmpImage->format->palette == nullptr)
    {
        const SDL_PixelFormat *const fmt = tmpImage->format;
        if (fmt->Amask != 0u)
        {
            const uint32_t amask = fmt->Amask;
            const uint8_t ashift = fmt->Ashift;
            const uint8_t aloss = fmt->Aloss;
            const uint32_t *pixels = static_cast<uint32_t*>(tmpImage->pixels);
            cilk_for (size_t i = 0; i < sz; ++ i)
            {
                const unsigned v = (pixels[i] & amask) >> ashift;
                const uint8_t a = static_cast<uint8_t>((v << aloss)
                    + (v >> (8 - (aloss << 1))));

                if (a != 255)
                    hasAlpha = true;

                alphaChannel[i] = a;
            }
        }
        else
        {
            ifconstexpr (SDL_ALPHA_OPAQUE != 255)
            {
                hasAlpha = true;
                memset(alphaChannel, SDL_ALPHA_OPAQUE, sz);
            }
        }
    }
    else
    {
        ifconstexpr (SDL_ALPHA_OPAQUE != 255)
        {
            hasAlpha = true;
            memset(alphaChannel, SDL_ALPHA_OPAQUE, sz);
        }
    }

    SDL_Surface *image;

    // Convert the surface to the current display format
    if (hasAlpha)
    {
        image = MSDL_DisplayFormatAlpha(tmpImage);
    }
    else
    {
        image = MSDL_DisplayFormat(tmpImage);

        // We also delete the alpha channel since
        // it's not used.
        delete [] alphaChannel;
        alphaChannel = nullptr;
    }

    if (image == nullptr)
    {
        reportAlways("Error: Image convert failed.");
        delete [] alphaChannel;
        return nullptr;
    }

    if (converted)
        MSDL_FreeSurface(tmpImage);
    return new Image(image, hasAlpha, alphaChannel);
}

int SDLImageHelper::combineSurface(SDL_Surface *restrict const src,
                                   SDL_Rect *restrict const srcrect,
                                   SDL_Surface *restrict const dst,
                                   SDL_Rect *restrict const dstrect)
{
#if SDL_BYTEORDER == SDL_LIL_ENDIAN
    return SDLgfxBlitRGBA(src, srcrect, dst, dstrect);
#else  // SDL_BYTEORDER == SDL_LIL_ENDIAN

    return SDL_gfxBlitRGBA(src, srcrect, dst, dstrect);
#endif  // SDL_BYTEORDER == SDL_LIL_ENDIAN
}

void SDLImageHelper::copySurfaceToImage(const Image *const image,
                                        const int x, const int y,
                                        SDL_Surface *const surface) const
{
    if ((image == nullptr) || (surface == nullptr))
        return;

    SDL_SetAlpha(surface, 0, SDL_ALPHA_OPAQUE);
    SDL_Rect rect =
    {
        CAST_S16(x), CAST_S16(y),
        CAST_U16(surface->w), static_cast<uint16_t>(surface->h)
    };

    SDL_BlitSurface(surface, nullptr, image->mSDLSurface, &rect);
}

#endif  // USE_SDL2