summaryrefslogtreecommitdiffstats
path: root/sub/draw_bmp.c
blob: 4057500f01e9e773129ae04805e16b0694be19be (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
557
558
559
560
561
562
563
564
565
566
567
/*
 * This file is part of mpv.
 *
 * mpv 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
 * (at your option) any later version.
 *
 * mpv 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 mpv; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include <stddef.h>
#include <stdbool.h>
#include <assert.h>
#include <math.h>
#include <inttypes.h>

#include <libavutil/common.h>

#include "core/mp_common.h"
#include "sub/draw_bmp.h"
#include "sub/sub.h"
#include "sub/img_convert.h"
#include "video/mp_image.h"
#include "video/sws_utils.h"
#include "video/img_format.h"
#include "video/csputils.h"

const bool mp_draw_sub_formats[SUBBITMAP_COUNT] = {
    [SUBBITMAP_LIBASS] = true,
    [SUBBITMAP_RGBA] = true,
};

struct sub_cache {
    struct mp_image *i, *a;
};

struct part {
    int bitmap_pos_id;
    int imgfmt;
    enum mp_csp colorspace;
    enum mp_csp_levels levels;
    int num_imgs;
    struct sub_cache *imgs;
};

struct mp_draw_sub_cache
{
    struct part *parts[MAX_OSD_PARTS];
    struct mp_image *upsample_img;
    struct mp_image upsample_temp;
};


static struct part *get_cache(struct mp_draw_sub_cache *cache,
                              struct sub_bitmaps *sbs, struct mp_image *format);
static bool get_sub_area(struct mp_rect bb, struct mp_image *temp,
                         struct sub_bitmap *sb, struct mp_image *out_area,
                         int *out_src_x, int *out_src_y);

#define ACCURATE
#define CONDITIONAL

static void blend_const16_alpha(void *dst, int dst_stride, uint16_t srcp,
                                uint8_t *srca, int srca_stride, uint8_t srcamul,
                                int w, int h)
{
    if (!srcamul)
        return;
    for (int y = 0; y < h; y++) {
        uint16_t *dst_r = (uint16_t *)((uint8_t *)dst + dst_stride * y);
        uint8_t *srca_r = srca + srca_stride * y;
        for (int x = 0; x < w; x++) {
            uint32_t srcap = srca_r[x];
#ifdef CONDITIONAL
            if (!srcap)
                continue;
#endif
            srcap *= srcamul; // now 0..65025
            dst_r[x] = (srcp * srcap + dst_r[x] * (65025 - srcap) + 32512) / 65025;
        }
    }
}

static void blend_const8_alpha(void *dst, int dst_stride, uint16_t srcp,
                               uint8_t *srca, int srca_stride, uint8_t srcamul,
                               int w, int h)
{
    if (!srcamul)
        return;
    for (int y = 0; y < h; y++) {
        uint8_t *dst_r = (uint8_t *)dst + dst_stride * y;
        uint8_t *srca_r = srca + srca_stride * y;
        for (int x = 0; x < w; x++) {
            uint32_t srcap = srca_r[x];
#ifdef CONDITIONAL
            if (!srcap)
                continue;
#endif
#ifdef ACCURATE
            srcap *= srcamul; // now 0..65025
            dst_r[x] = (srcp * srcap + dst_r[x] * (65025 - srcap) + 32512) / 65025;
#else
            srcap = (srcap * srcamul + 255) >> 8;
            dst_r[x] = (srcp * srcap + dst_r[x] * (255 - srcap) + 255) >> 8;
#endif
        }
    }
}

static void blend_const_alpha(void *dst, int dst_stride, int srcp,
                              uint8_t *srca, int srca_stride, uint8_t srcamul,
                              int w, int h, int bytes)
{
    if (bytes == 2) {
        blend_const16_alpha(dst, dst_stride, srcp, srca, srca_stride, srcamul,
                            w, h);
    } else if (bytes == 1) {
        blend_const8_alpha(dst, dst_stride, srcp, srca, srca_stride, srcamul,
                           w, h);
    }
}

static void blend_src16_alpha(void *dst, int dst_stride, void *src,
                              int src_stride, uint8_t *srca, int srca_stride,
                              int w, int h)
{
    for (int y = 0; y < h; y++) {
        uint16_t *dst_r = (uint16_t *)((uint8_t *)dst + dst_stride * y);
        uint16_t *src_r = (uint16_t *)((uint8_t *)src + src_stride * y);
        uint8_t *srca_r = srca + srca_stride * y;
        for (int x = 0; x < w; x++) {
            uint32_t srcap = srca_r[x];
#ifdef CONDITIONAL
            if (!srcap)
                continue;
#endif
            dst_r[x] = (src_r[x] * srcap + dst_r[x] * (255 - srcap) + 127) / 255;
        }
    }
}

static void blend_src8_alpha(void *dst, int dst_stride, void *src,
                             int src_stride, uint8_t *srca, int srca_stride,
                             int w, int h)
{
    for (int y = 0; y < h; y++) {
        uint8_t *dst_r = (uint8_t *)dst + dst_stride * y;
        uint8_t *src_r = (uint8_t *)src + src_stride * y;
        uint8_t *srca_r = srca + srca_stride * y;
        for (int x = 0; x < w; x++) {
            uint16_t srcap = srca_r[x];
#ifdef CONDITIONAL
            if (!srcap)
                continue;
#endif
#ifdef ACCURATE
            dst_r[x] = (src_r[x] * srcap + dst_r[x] * (255 - srcap) + 127) / 255;
#else
            dst_r[x] = (src_r[x] * srcap + dst_r[x] * (255 - srcap) + 255) >> 8;
#endif
        }
    }
}

static void blend_src_alpha(void *dst, int dst_stride, void *src,
                            int src_stride, uint8_t *srca, int srca_stride,
                            int w, int h, int bytes)
{
    if (bytes == 2) {
        blend_src16_alpha(dst, dst_stride, src, src_stride, srca, srca_stride,
                          w, h);
    } else if (bytes == 1) {
        blend_src8_alpha(dst, dst_stride, src, src_stride, srca, srca_stride,
                         w, h);
    }
}

static void unpremultiply_and_split_BGR32(struct mp_image *img,
                                          struct mp_image *alpha)
{
    for (int y = 0; y < img->h; ++y) {
        uint32_t *irow = (uint32_t *) &img->planes[0][img->stride[0] * y];
        uint8_t *arow = &alpha->planes[0][alpha->stride[0] * y];
        for (int x = 0; x < img->w; ++x) {
            uint32_t pval = irow[x];
            uint8_t aval = (pval >> 24);
            uint8_t rval = (pval >> 16) & 0xFF;
            uint8_t gval = (pval >> 8) & 0xFF;
            uint8_t bval = pval & 0xFF;
            // multiplied = separate * alpha / 255
            // separate = rint(multiplied * 255 / alpha)
            //          = floor(multiplied * 255 / alpha + 0.5)
            //          = floor((multiplied * 255 + 0.5 * alpha) / alpha)
            //          = floor((multiplied * 255 + floor(0.5 * alpha)) / alpha)
            int div = (int) aval;
            int add = div / 2;
            if (aval) {
                rval = FFMIN(255, (rval * 255 + add) / div);
                gval = FFMIN(255, (gval * 255 + add) / div);
                bval = FFMIN(255, (bval * 255 + add) / div);
                irow[x] = bval + (gval << 8) + (rval << 16) + (aval << 24);
            }
            arow[x] = aval;
        }
    }
}

// dst_format merely contains the target colorspace/format information
static void scale_sb_rgba(struct sub_bitmap *sb, struct mp_image *dst_format,
                          struct mp_image **out_sbi, struct mp_image **out_sba)
{
    struct mp_image sbisrc = {0};
    mp_image_setfmt(&sbisrc, IMGFMT_BGR32);
    mp_image_set_size(&sbisrc, sb->w, sb->h);
    sbisrc.planes[0] = sb->bitmap;
    sbisrc.stride[0] = sb->stride;
    struct mp_image *sbisrc2 = mp_image_alloc(IMGFMT_BGR32, sb->dw, sb->dh);
    mp_image_swscale(sbisrc2, &sbisrc, SWS_BILINEAR);

    struct mp_image *sba = mp_image_alloc(IMGFMT_Y8, sb->dw, sb->dh);
    unpremultiply_and_split_BGR32(sbisrc2, sba);

    struct mp_image *sbi = mp_image_alloc(dst_format->imgfmt, sb->dw, sb->dh);
    sbi->colorspace = dst_format->colorspace;
    sbi->levels = dst_format->levels;
    mp_image_swscale(sbi, sbisrc2, SWS_BILINEAR);

    talloc_free(sbisrc2);

    *out_sbi = sbi;
    *out_sba = sba;
}

static void draw_rgba(struct mp_draw_sub_cache *cache, struct mp_rect bb,
                      struct mp_image *temp, int bits,
                      struct sub_bitmaps *sbs)
{
    struct part *part = get_cache(cache, sbs, temp);
    assert(part);

    for (int i = 0; i < sbs->num_parts; ++i) {
        struct sub_bitmap *sb = &sbs->parts[i];

        if (sb->w < 1 || sb->h < 1)
            continue;

        struct mp_image dst;
        int src_x, src_y;
        if (!get_sub_area(bb, temp, sb, &dst, &src_x, &src_y))
            continue;

        struct mp_image *sbi = part->imgs[i].i;
        struct mp_image *sba = part->imgs[i].a;

        if (!(sbi && sba))
            scale_sb_rgba(sb, temp, &sbi, &sba);

        int bytes = (bits + 7) / 8;
        uint8_t *alpha_p = sba->planes[0] + src_y * sba->stride[0] + src_x;
        for (int p = 0; p < (temp->num_planes > 2 ? 3 : 1); p++) {
            void *src = sbi->planes[p] + src_y * sbi->stride[p] + src_x * bytes;
            blend_src_alpha(dst.planes[p], dst.stride[p], src, sbi->stride[p],
                            alpha_p, sba->stride[0], dst.w, dst.h, bytes);
        }

        part->imgs[i].i = talloc_steal(part, sbi);
        part->imgs[i].a = talloc_steal(part, sba);
    }
}

static void draw_ass(struct mp_draw_sub_cache *cache, struct mp_rect bb,
                     struct mp_image *temp, int bits, struct sub_bitmaps *sbs)
{
    struct mp_csp_params cspar = MP_CSP_PARAMS_DEFAULTS;
    cspar.colorspace.format = temp->colorspace;
    cspar.colorspace.levels_in = temp->levels;
    cspar.colorspace.levels_out = MP_CSP_LEVELS_PC; // RGB (libass.color)
    cspar.int_bits_in = bits;
    cspar.int_bits_out = 8;

    float yuv2rgb[3][4], rgb2yuv[3][4];
    if (temp->flags & MP_IMGFLAG_YUV) {
        mp_get_yuv2rgb_coeffs(&cspar, yuv2rgb);
        mp_invert_yuv2rgb(rgb2yuv, yuv2rgb);
    }

    for (int i = 0; i < sbs->num_parts; ++i) {
        struct sub_bitmap *sb = &sbs->parts[i];

        struct mp_image dst;
        int src_x, src_y;
        if (!get_sub_area(bb, temp, sb, &dst, &src_x, &src_y))
            continue;

        int r = (sb->libass.color >> 24) & 0xFF;
        int g = (sb->libass.color >> 16) & 0xFF;
        int b = (sb->libass.color >> 8) & 0xFF;
        int a = 255 - (sb->libass.color & 0xFF);
        int color_yuv[3] = {r, g, b};
        if (dst.flags & MP_IMGFLAG_YUV) {
            mp_map_int_color(rgb2yuv, bits, color_yuv);
        } else {
            assert(dst.imgfmt == IMGFMT_GBRP);
            color_yuv[0] = g;
            color_yuv[1] = b;
            color_yuv[2] = r;
        }

        int bytes = (bits + 7) / 8;
        uint8_t *alpha_p = (uint8_t *)sb->bitmap + src_y * sb->stride + src_x;
        for (int p = 0; p < (temp->num_planes > 2 ? 3 : 1); p++) {
            blend_const_alpha(dst.planes[p], dst.stride[p], color_yuv[p],
                              alpha_p, sb->stride, a, dst.w, dst.h, bytes);
        }
    }
}

static void get_swscale_alignment(const struct mp_image *img, int *out_xstep,
                                  int *out_ystep)
{
    int sx = (1 << img->chroma_x_shift);
    int sy = (1 << img->chroma_y_shift);

    for (int p = 0; p < img->num_planes; ++p) {
        int bits = img->fmt.bpp[p];
        // the * 2 fixes problems with writing past the destination width
        while (((sx >> img->chroma_x_shift) * bits) % (SWS_MIN_BYTE_ALIGN * 8 * 2))
            sx *= 2;
    }

    *out_xstep = sx;
    *out_ystep = sy;
}

static void align_bbox(int xstep, int ystep, struct mp_rect *rc)
{
    rc->x0 = rc->x0 & ~(xstep - 1);
    rc->y0 = rc->y0 & ~(ystep - 1);
    rc->x1 = FFALIGN(rc->x1, xstep);
    rc->y1 = FFALIGN(rc->y1, ystep);
}

// Post condition, if true returned: rc is inside img
static bool align_bbox_for_swscale(struct mp_image *img, struct mp_rect *rc)
{
    struct mp_rect img_rect = {0, 0, img->w, img->h};
    // Get rid of negative coordinates
    if (!mp_rect_intersection(rc, &img_rect))
        return false;
    int xstep, ystep;
    get_swscale_alignment(img, &xstep, &ystep);
    align_bbox(xstep, ystep, rc);
    return mp_rect_intersection(rc, &img_rect);
}

// Try to find best/closest YUV 444 format (or similar) for imgfmt
static void get_closest_y444_format(int imgfmt, int *out_format, int *out_bits)
{
    struct mp_imgfmt_desc desc = mp_imgfmt_get_desc(imgfmt);
    if (desc.flags & MP_IMGFLAG_RGB) {
        *out_format = IMGFMT_GBRP;
        *out_bits = 8;
        return;
    } else if (desc.flags & MP_IMGFLAG_YUV_P) {
        *out_format = mp_imgfmt_find_yuv_planar(0, 0, desc.num_planes,
                                                desc.plane_bits);
        if (*out_format && mp_sws_supported_format(*out_format)) {
            *out_bits = mp_imgfmt_get_desc(*out_format).plane_bits;
            return;
        }
    }
    // fallback
    *out_format = IMGFMT_444P;
    *out_bits = 8;
}

static struct part *get_cache(struct mp_draw_sub_cache *cache,
                              struct sub_bitmaps *sbs, struct mp_image *format)
{
    struct part *part = NULL;

    bool use_cache = sbs->format == SUBBITMAP_RGBA;
    if (use_cache) {
        part = cache->parts[sbs->render_index];
        if (part) {
            if (part->bitmap_pos_id != sbs->bitmap_pos_id
                || part->imgfmt != format->imgfmt
                || part->colorspace != format->colorspace
                || part->levels != format->levels)
            {
                talloc_free(part);
                part = NULL;
            }
        }
        if (!part) {
            part = talloc(cache, struct part);
            *part = (struct part) {
                .bitmap_pos_id = sbs->bitmap_pos_id,
                .num_imgs = sbs->num_parts,
                .imgfmt = format->imgfmt,
                .levels = format->levels,
                .colorspace = format->colorspace,
            };
            part->imgs = talloc_zero_array(part, struct sub_cache,
                                           part->num_imgs);
        }
        assert(part->num_imgs == sbs->num_parts);
        cache->parts[sbs->render_index] = part;
    }

    return part;
}

// Return area of intersection between target and sub-bitmap as cropped image
static bool get_sub_area(struct mp_rect bb, struct mp_image *temp,
                         struct sub_bitmap *sb, struct mp_image *out_area,
                         int *out_src_x, int *out_src_y)
{
    // coordinates are relative to the bbox
    struct mp_rect dst = {sb->x - bb.x0, sb->y - bb.y0};
    dst.x1 = dst.x0 + sb->dw;
    dst.y1 = dst.y0 + sb->dh;
    if (!mp_rect_intersection(&dst, &(struct mp_rect){0, 0, temp->w, temp->h}))
        return false;

    *out_src_x = (dst.x0 - sb->x) + bb.x0;
    *out_src_y = (dst.y0 - sb->y) + bb.y0;
    *out_area = *temp;
    mp_image_crop_rc(out_area, dst);

    return true;
}

// Convert the src image to imgfmt (which should be a 444 format)
static struct mp_image *chroma_up(struct mp_draw_sub_cache *cache, int imgfmt,
                                  struct mp_image *src)
{
    if (src->imgfmt == imgfmt)
        return src;

    if (!cache->upsample_img || cache->upsample_img->imgfmt != imgfmt ||
        cache->upsample_img->w < src->w || cache->upsample_img->h < src->h)
    {
        talloc_free(cache->upsample_img);
        cache->upsample_img = mp_image_alloc(imgfmt, src->w, src->h);
        talloc_steal(cache, cache->upsample_img);
    }

    cache->upsample_temp = *cache->upsample_img;
    struct mp_image *temp = &cache->upsample_temp;
    mp_image_set_size(temp, src->w, src->h);

    // The temp image is always YUV, but src not necessarily.
    // Reduce amount of conversions in YUV case (upsampling/shifting only)
    if (src->flags & MP_IMGFLAG_YUV) {
        temp->colorspace = src->colorspace;
        temp->levels = src->levels;
    }

    if (src->imgfmt == IMGFMT_420P) {
        assert(imgfmt == IMGFMT_444P);
        // Faster upsampling: keep Y plane, upsample chroma planes only
        // The whole point is not having swscale copy the Y plane
        struct mp_image t_dst = *temp;
        mp_image_setfmt(&t_dst, IMGFMT_Y8);
        mp_image_set_size(&t_dst, temp->chroma_width, temp->chroma_height);
        struct mp_image t_src = t_dst;
        mp_image_set_size(&t_src, src->chroma_width, src->chroma_height);
        for (int c = 0; c < 2; c++) {
            t_dst.planes[0] = temp->planes[1 + c];
            t_dst.stride[0] = temp->stride[1 + c];
            t_src.planes[0] = src->planes[1 + c];
            t_src.stride[0] = src->stride[1 + c];
            mp_image_swscale(&t_dst, &t_src, SWS_POINT);
        }
        temp->planes[0] = src->planes[0];
        temp->stride[0] = src->stride[0];
    } else {
        mp_image_swscale(temp, src, SWS_POINT);
    }

    return temp;
}

// Undo chroma_up() (copy temp to old_src if needed)
static void chroma_down(struct mp_image *old_src, struct mp_image *temp)
{
    assert(old_src->w == temp->w && old_src->h == temp->h);
    if (temp != old_src) {
        if (old_src->imgfmt == IMGFMT_420P) {
            // Downsampling, skipping the Y plane (see chroma_up())
            assert(temp->imgfmt == IMGFMT_444P);
            assert(temp->planes[0] == old_src->planes[0]);
            struct mp_image t_dst = *temp;
            mp_image_setfmt(&t_dst, IMGFMT_Y8);
            mp_image_set_size(&t_dst, old_src->chroma_width,
                              old_src->chroma_height);
            struct mp_image t_src = t_dst;
            mp_image_set_size(&t_src, temp->chroma_width, temp->chroma_height);
            for (int c = 0; c < 2; c++) {
                t_dst.planes[0] = old_src->planes[1 + c];
                t_dst.stride[0] = old_src->stride[1 + c];
                t_src.planes[0] = temp->planes[1 + c];
                t_src.stride[0] = temp->stride[1 + c];
                mp_image_swscale(&t_dst, &t_src, SWS_AREA);
            }
        } else {
            mp_image_swscale(old_src, temp, SWS_AREA); // chroma down
        }
    }
}

// cache: if not NULL, the function will set *cache to a talloc-allocated cache
//        containing scaled versions of sbs contents - free the cache with
//        talloc_free()
void mp_draw_sub_bitmaps(struct mp_draw_sub_cache **cache, struct mp_image *dst,
                         struct sub_bitmaps *sbs)
{
    assert(mp_draw_sub_formats[sbs->format]);
    if (!mp_sws_supported_format(dst->imgfmt))
        return;

    struct mp_draw_sub_cache *cache_ = cache ? *cache : NULL;
    if (!cache_)
        cache_ = talloc_zero(NULL, struct mp_draw_sub_cache);

    int format, bits;
    get_closest_y444_format(dst->imgfmt, &format, &bits);

    struct mp_rect rc_list[MP_SUB_BB_LIST_MAX];
    int num_rc = mp_get_sub_bb_list(sbs, rc_list, MP_SUB_BB_LIST_MAX);

    for (int r = 0; r < num_rc; r++) {
        struct mp_rect bb = rc_list[r];

        if (!align_bbox_for_swscale(dst, &bb))
            return;

        struct mp_image dst_region = *dst;
        mp_image_crop_rc(&dst_region, bb);
        struct mp_image *temp = chroma_up(cache_, format, &dst_region);

        if (sbs->format == SUBBITMAP_RGBA) {
            draw_rgba(cache_, bb, temp, bits, sbs);
        } else if (sbs->format == SUBBITMAP_LIBASS) {
            draw_ass(cache_, bb, temp, bits, sbs);
        }

        chroma_down(&dst_region, temp);
    }

    if (cache) {
        *cache = cache_;
    } else {
        talloc_free(cache_);
    }
}

// vim: ts=4 sw=4 et tw=80