summaryrefslogtreecommitdiff
path: root/beos/bitmap.cpp
blob: 3228770a48abb7551cb069cd42509287ce431dd1 (plain)
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
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
/*
 * Copyright 2008 Fran├žois Revol <mmu_man@users.sourceforge.net>
 *
 * This file is part of NetSurf, http://www.netsurf-browser.org/
 *
 * NetSurf 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; version 2 of the License.
 *
 * NetSurf 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/>.
 */

/**
 * \file
 * BeOS implementation of generic bitmaps.
 *
 * This implements the interface given by image/bitmap.h using BBitmap.
 */

#define __STDBOOL_H__	1
#include <assert.h>
#include <sys/param.h>
#include <string.h>
#include <Bitmap.h>
#include <BitmapStream.h>
#include <File.h>
#include <GraphicsDefs.h>
#include <TranslatorFormats.h>
#include <TranslatorRoster.h>
#include <View.h>

extern "C" {
#include "utils/log.h"
#include "content/content.h"
#include "content/urldb.h"
#include "desktop/plotters.h"
#include "desktop/browser.h"
#include "desktop/font.h"
#include "image/bitmap.h"
}

#include "beos/bitmap.h"
#include "beos/gui.h"
#include "beos/scaffolding.h"
#include "beos/plotters.h"


struct bitmap {
        BBitmap *primary;
        BBitmap *shadow; // in NetSurf's ABGR order
        BBitmap *pretile_x;
        BBitmap *pretile_y;
        BBitmap *pretile_xy;
        bool opaque;
};

#define MIN_PRETILE_WIDTH 256
#define MIN_PRETILE_HEIGHT 256

#warning TODO: check rgba order
#warning TODO: add correct locking (not strictly required)


/**
 * Convert to BeOS RGBA32_LITTLE (strictly BGRA) from NetSurf's favoured ABGR format.
 *
 * Copies the converted data elsewhere.  Operation is rotate left 8 bits.
 *
 * \param src       Source 32-bit pixels arranged in ABGR order.
 * \param dst       Output data in BGRA order.
 * \param width     Width of the bitmap
 * \param height    Height of the bitmap
 * \param rowstride Number of bytes to skip after each row (this implementation
 *                  requires this to be a multiple of 4.)
 */
static inline void nsbeos_rgba_to_bgra(void *src,
                                       void *dst,
                                       int width,
                                       int height,
                                       size_t rowstride)
{
        struct abgr { uint8 a, b, g, r; };
        struct rgba { uint8 r, g, b ,a; };
        struct bgra { uint8 b, g, r, a; };
        struct rgba *from = (struct rgba *)src;
        struct bgra *to = (struct bgra *)dst;

        rowstride >>= 2;

        for (int y = 0; y < height; y++) {
                for (int x = 0; x < width; x++) {
                        to[x].b = from[x].b;
                        to[x].g = from[x].g;
                        to[x].r = from[x].r;
                        to[x].a = from[x].a;
                        /*
                          if (from[x].a == 0)
                          *(rgb_color *)&to[x] = B_TRANSPARENT_32_BIT;
                          */
                }
                from += rowstride;
                to += rowstride;
        }
}


/**
 * Create a bitmap.
 *
 * \param  width   width of image in pixels
 * \param  height  width of image in pixels
 * \param  state   a flag word indicating the initial state
 * \return an opaque struct bitmap, or NULL on memory exhaustion
 */
void *bitmap_create(int width, int height, unsigned int state)
{
        struct bitmap *bmp = (struct bitmap *)malloc(sizeof(struct bitmap));
        if (bmp == NULL)
                return NULL;

        int32 flags = 0;
        if (state & BITMAP_CLEAR_MEMORY)
                flags |= B_BITMAP_CLEAR_TO_WHITE;

        BRect frame(0, 0, width - 1, height - 1);
        //XXX: bytes per row ?
        bmp->primary = new BBitmap(frame, flags, B_RGBA32);
        bmp->shadow = new BBitmap(frame, flags, B_RGBA32);

        bmp->pretile_x = bmp->pretile_y = bmp->pretile_xy = NULL;

        bmp->opaque = (state & BITMAP_OPAQUE) != 0;

        return bmp;
}


/**
 * Sets whether a bitmap should be plotted opaque
 *
 * \param  vbitmap  a bitmap, as returned by bitmap_create()
 * \param  opaque   whether the bitmap should be plotted opaque
 */
void bitmap_set_opaque(void *vbitmap, bool opaque)
{
        struct bitmap *bitmap = (struct bitmap *)vbitmap;
        assert(bitmap);
        bitmap->opaque = opaque;
}


/**
 * Tests whether a bitmap has an opaque alpha channel
 *
 * \param  vbitmap  a bitmap, as returned by bitmap_create()
 * \return whether  the bitmap is opaque
 */
bool bitmap_test_opaque(void *vbitmap)
{
        struct bitmap *bitmap = (struct bitmap *)vbitmap;
        assert(bitmap);
        /* todo: test if bitmap is opaque */
        return false;
}


/**
 * Gets whether a bitmap should be plotted opaque
 *
 * \param  vbitmap  a bitmap, as returned by bitmap_create()
 */
bool bitmap_get_opaque(void *vbitmap)
{
        struct bitmap *bitmap = (struct bitmap *)vbitmap;
        assert(bitmap);
        return bitmap->opaque;
}


/**
 * Return a pointer to the pixel data in a bitmap.
 *
 * \param  vbitmap  a bitmap, as returned by bitmap_create()
 * \return pointer to the pixel buffer
 *
 * The pixel data is packed as BITMAP_FORMAT, possibly with padding at the end
 * of rows. The width of a row in bytes is given by bitmap_get_rowstride().
 */

unsigned char *bitmap_get_buffer(void *vbitmap)
{
        struct bitmap *bitmap = (struct bitmap *)vbitmap;
        assert(bitmap);
        return (unsigned char *)(bitmap->shadow->Bits());
}


/**
 * Find the width of a pixel row in bytes.
 *
 * \param  vbitmap  a bitmap, as returned by bitmap_create()
 * \return width of a pixel row in the bitmap
 */
size_t bitmap_get_rowstride(void *vbitmap)
{
        struct bitmap *bitmap = (struct bitmap *)vbitmap;
        assert(bitmap);
        return (bitmap->primary->BytesPerRow());
}


/**
 * Find the bytes per pixels of a bitmap.
 *
 * \param  vbitmap  a bitmap, as returned by bitmap_create()
 * \return bytes per pixels of the bitmap
 */
size_t bitmap_get_bpp(void *vbitmap)
{
        struct bitmap *bitmap = (struct bitmap *)vbitmap;
        assert(bitmap);
        return 4;
}


/**
 * Free pretiles of a bitmap.
 *
 * \param bitmap The bitmap to free the pretiles of.
 */
static void nsbeos_bitmap_free_pretiles(struct bitmap *bitmap)
{
#define FREE_TILE(XY) if (bitmap->pretile_##XY) delete (bitmap->pretile_##XY); bitmap->pretile_##XY = NULL
        FREE_TILE(x);
        FREE_TILE(y);
        FREE_TILE(xy);
#undef FREE_TILE
}


/**
 * Free a bitmap.
 *
 * \param  vbitmap  a bitmap, as returned by bitmap_create()
 */
void bitmap_destroy(void *vbitmap)
{
        struct bitmap *bitmap = (struct bitmap *)vbitmap;
        assert(bitmap);
        nsbeos_bitmap_free_pretiles(bitmap);
        delete bitmap->primary;
        delete bitmap->shadow;
        free(bitmap);
}


/**
 * Save a bitmap in the platform's native format.
 *
 * \param  vbitmap  a bitmap, as returned by bitmap_create()
 * \param  path     pathname for file
 * \param  flags    modify the behaviour of the save
 * \return true on success, false on error and error reported
 */
bool bitmap_save(void *vbitmap, const char *path, unsigned flags)
{
        struct bitmap *bitmap = (struct bitmap *)vbitmap;
        BTranslatorRoster *roster = BTranslatorRoster::Default();
        BBitmapStream stream(bitmap->primary);
        BFile file(path, B_WRITE_ONLY | B_CREATE_FILE);
        uint32 type = B_PNG_FORMAT;

        if (file.InitCheck() < B_OK)
                return false;

        if (roster->Translate(&stream, NULL, NULL, &file, type) < B_OK)
                return false;

        return true;
}


/**
 * The bitmap image has changed, so flush any persistant cache.
 *
 * \param  vbitmap  a bitmap, as returned by bitmap_create()
 */
void bitmap_modified(void *vbitmap)
{
        struct bitmap *bitmap = (struct bitmap *)vbitmap;
        // convert the shadow (ABGR) to into the primary bitmap
        nsbeos_rgba_to_bgra(bitmap->shadow->Bits(), bitmap->primary->Bits(),
                            bitmap->primary->Bounds().Width() + 1,
                            bitmap->primary->Bounds().Height() + 1,
                            bitmap->primary->BytesPerRow());
        nsbeos_bitmap_free_pretiles(bitmap);
}


int bitmap_get_width(void *vbitmap)
{
        struct bitmap *bitmap = (struct bitmap *)vbitmap;
        return bitmap->primary->Bounds().Width() + 1;
}


int bitmap_get_height(void *vbitmap)
{
        struct bitmap *bitmap = (struct bitmap *)vbitmap;
        return bitmap->primary->Bounds().Height() + 1;
}


static BBitmap *
nsbeos_bitmap_generate_pretile(BBitmap *primary, int repeat_x, int repeat_y)
{
        int width = primary->Bounds().Width() + 1;
        int height = primary->Bounds().Height() + 1;
        size_t primary_stride = primary->BytesPerRow();
        BRect frame(0, 0, width * repeat_x - 1, height * repeat_y - 1);
        BBitmap *result = new BBitmap(frame, 0, B_RGBA32);

        char *target_buffer = (char *)result->Bits();
        int x,y,row;
        /* This algorithm won't work if the strides are not multiples */
        assert((size_t)(result->BytesPerRow()) ==
               (primary_stride * repeat_x));

        if (repeat_x == 1 && repeat_y == 1) {
                delete result;
                // just return a copy
                return new BBitmap(primary);
        }

        for (y = 0; y < repeat_y; ++y) {
                char *primary_buffer = (char *)primary->Bits();
                for (row = 0; row < height; ++row) {
                        for (x = 0; x < repeat_x; ++x) {
                                memcpy(target_buffer,
                                       primary_buffer, primary_stride);
                                target_buffer += primary_stride;
                        }
                        primary_buffer += primary_stride;
                }
        }
        return result;

}


/**
 * The primary image associated with this bitmap object.
 *
 * \param  bitmap  a bitmap, as returned by bitmap_create()
 */
BBitmap *
nsbeos_bitmap_get_primary(struct bitmap* bitmap)
{
        return bitmap->primary;
}


/**
 * The X-pretiled image associated with this bitmap object.
 *
 * \param  bitmap  a bitmap, as returned by bitmap_create()
 */
BBitmap *
nsbeos_bitmap_get_pretile_x(struct bitmap* bitmap)
{
        if (!bitmap->pretile_x) {
                int width = bitmap->primary->Bounds().Width() + 1;
                int xmult = (MIN_PRETILE_WIDTH + width - 1)/width;
                LOG("Pretiling %p for X*%d", bitmap, xmult);
                bitmap->pretile_x = nsbeos_bitmap_generate_pretile(bitmap->primary, xmult, 1);
        }
        return bitmap->pretile_x;

}


/**
 * The Y-pretiled image associated with this bitmap object.
 *
 * \param  bitmap  a bitmap, as returned by bitmap_create()
 */
BBitmap *
nsbeos_bitmap_get_pretile_y(struct bitmap* bitmap)
{
        if (!bitmap->pretile_y) {
                int height = bitmap->primary->Bounds().Height() + 1;
                int ymult = (MIN_PRETILE_HEIGHT + height - 1)/height;
                LOG("Pretiling %p for Y*%d", bitmap, ymult);
                bitmap->pretile_y = nsbeos_bitmap_generate_pretile(bitmap->primary, 1, ymult);
        }
        return bitmap->pretile_y;
}


/**
 * The XY-pretiled image associated with this bitmap object.
 *
 * \param  bitmap  a bitmap, as returned by bitmap_create()
 */
BBitmap *
nsbeos_bitmap_get_pretile_xy(struct bitmap* bitmap)
{
        if (!bitmap->pretile_xy) {
                int width = bitmap->primary->Bounds().Width() + 1;
                int height = bitmap->primary->Bounds().Height() + 1;
                int xmult = (MIN_PRETILE_WIDTH + width - 1)/width;
                int ymult = (MIN_PRETILE_HEIGHT + height - 1)/height;
                LOG("Pretiling %p for X*%d Y*%d", bitmap, xmult, ymult);
                bitmap->pretile_xy = nsbeos_bitmap_generate_pretile(bitmap->primary, xmult, ymult);
        }
        return bitmap->pretile_xy;
}


/**
 * Create a thumbnail of a page.
 *
 * \param  bitmap   the bitmap to draw to
 * \param  content  content structure to thumbnail
 * \return true on success and bitmap updated else false
 */
static nserror bitmap_render(struct bitmap *bitmap, hlcache_handle *content)
{
        BBitmap *thumbnail;
        BBitmap *small;
        BBitmap *big;
        BView *oldView;
        BView *view;
        BView *thumbView;
        float width;
        float height;
        int big_width;
        int big_height;
        int depth;

        struct redraw_context ctx;
        ctx.interactive = false;
        ctx.background_images = true;
        ctx.plot = &nsbeos_plotters;

        assert(content);
        assert(bitmap);

        thumbnail = nsbeos_bitmap_get_primary(bitmap);
        width = thumbnail->Bounds().Width();
        height = thumbnail->Bounds().Height();
        depth = 32;

        big_width = MIN(content_get_width(content), 1024);
        big_height = (int)(((big_width * height) + (width / 2)) / width);

        BRect contentRect(0, 0, big_width - 1, big_height - 1);
        big = new BBitmap(contentRect, B_BITMAP_ACCEPTS_VIEWS, B_RGB32);

        if (big->InitCheck() < B_OK) {
                delete big;
                return NSERROR_NOMEM;
        }

        small = new BBitmap(thumbnail->Bounds(),
                            B_BITMAP_ACCEPTS_VIEWS, B_RGB32);

        if (small->InitCheck() < B_OK) {
                delete small;
                delete big;
                return NSERROR_NOMEM;
        }

        //XXX: _lock ?
        // backup the current gc
        oldView = nsbeos_current_gc();

        view = new BView(contentRect, "thumbnailer",
                         B_FOLLOW_NONE, B_WILL_DRAW);
        big->AddChild(view);

        thumbView = new BView(small->Bounds(), "thumbnail",
                              B_FOLLOW_NONE, B_WILL_DRAW);
        small->AddChild(thumbView);

        view->LockLooper();

        /* impose our view on the content... */
        nsbeos_current_gc_set(view);

        /* render the content */
        content_scaled_redraw(content, big_width, big_height, &ctx);

        view->Sync();
        view->UnlockLooper();

        // restore the current gc
        nsbeos_current_gc_set(oldView);


        // now scale it down
        //XXX: use Zeta's bilinear scaler ?
        //#ifdef B_ZETA_VERSION
        //	err = ScaleBitmap(*shot, *scaledBmp);
        //#else
        thumbView->LockLooper();
        thumbView->DrawBitmap(big, big->Bounds(), small->Bounds());
        thumbView->Sync();
        thumbView->UnlockLooper();

        small->LockBits();
        thumbnail->LockBits();

        // copy it to the bitmap
        memcpy(thumbnail->Bits(), small->Bits(), thumbnail->BitsLength());

        thumbnail->UnlockBits();
        small->UnlockBits();

        bitmap_modified(bitmap);

        // cleanup
        small->RemoveChild(thumbView);
        delete thumbView;
        delete small;
        big->RemoveChild(view);
        delete view;
        delete big;

        return NSERROR_OK;
}


static struct gui_bitmap_table bitmap_table = {
        .create = bitmap_create,
        .destroy = bitmap_destroy,
        .set_opaque = bitmap_set_opaque,
        .get_opaque = bitmap_get_opaque,
        .test_opaque = bitmap_test_opaque,
        .get_buffer = bitmap_get_buffer,
        .get_rowstride = bitmap_get_rowstride,
        .get_width = bitmap_get_width,
        .get_height = bitmap_get_height,
        .get_bpp = bitmap_get_bpp,
        .save = bitmap_save,
        .modified = bitmap_modified,
        .render = bitmap_render,
};

struct gui_bitmap_table *beos_bitmap_table = &bitmap_table;