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mpv/sub/img_convert.c
wm4 92720fcc0e Revert "sub: support straight alpha additionally to premultiplied alpha" 
This reverts commit 689a25003f, with some
adjustments to code that was added after that commit.

I just messed up big time. We don't need this, and in fact the commit
confused straight and premultiplied alpha at one point (just a simple
inverted condition due to an oversight), which is why it looked like
it was working.

In commit 2827295 I wrote:

   Also, libva can't decide whether it accepts straight or premultiplied
   alpha for OSD sub-pictures [...]

That was just me messing up and being severely confused by my own bugs.
VA API  uses premultiplied alpha, which by the way is nice and
thoughtful of the VA API devs.

Well, this was stupid. But in the end, I'm glad that I could actually
reduce codesize by a good amount again.
2013-08-12 02:49:22 +02:00

390 lines
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/*
* This file is part of mplayer.
*
* mplayer 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.
*
* mplayer 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 mplayer. If not, see <http://www.gnu.org/licenses/>.
*/
#include <string.h>
#include <assert.h>
#include <libavutil/mem.h>
#include <libavutil/common.h>
#include "talloc.h"
#include "img_convert.h"
#include "sub.h"
#include "video/img_format.h"
#include "video/mp_image.h"
#include "video/sws_utils.h"
#include "video/memcpy_pic.h"
struct osd_conv_cache {
struct sub_bitmap part[MP_SUB_BB_LIST_MAX];
struct sub_bitmap *parts;
void *scratch;
};
struct osd_conv_cache *osd_conv_cache_new(void)
{
return talloc_zero(NULL, struct osd_conv_cache);
}
static void rgba_to_premultiplied_rgba(uint32_t *colors, size_t count)
{
for (int n = 0; n < count; n++) {
uint32_t c = colors[n];
int b = c & 0xFF;
int g = (c >> 8) & 0xFF;
int r = (c >> 16) & 0xFF;
int a = (c >> 24) & 0xFF;
b = b * a / 255;
g = g * a / 255;
r = r * a / 255;
colors[n] = b | (g << 8) | (r << 16) | (a << 24);
}
}
bool osd_conv_idx_to_rgba(struct osd_conv_cache *c, struct sub_bitmaps *imgs)
{
struct sub_bitmaps src = *imgs;
if (src.format != SUBBITMAP_INDEXED)
return false;
imgs->format = SUBBITMAP_RGBA;
talloc_free(c->parts);
imgs->parts = c->parts = talloc_array(c, struct sub_bitmap, src.num_parts);
for (int n = 0; n < src.num_parts; n++) {
struct sub_bitmap *d = &imgs->parts[n];
struct sub_bitmap *s = &src.parts[n];
struct osd_bmp_indexed sb = *(struct osd_bmp_indexed *)s->bitmap;
rgba_to_premultiplied_rgba(sb.palette, 256);
*d = *s;
struct mp_image *image = mp_image_alloc(IMGFMT_BGRA, s->w, s->h);
talloc_steal(c->parts, image);
d->stride = image->stride[0];
d->bitmap = image->planes[0];
for (int y = 0; y < s->h; y++) {
uint8_t *inbmp = sb.bitmap + y * s->stride;
uint32_t *outbmp = (uint32_t*)((uint8_t*)d->bitmap + y * d->stride);
for (int x = 0; x < s->w; x++)
*outbmp++ = sb.palette[*inbmp++];
}
}
return true;
}
bool osd_conv_blur_rgba(struct osd_conv_cache *c, struct sub_bitmaps *imgs,
double gblur)
{
struct sub_bitmaps src = *imgs;
if (src.format != SUBBITMAP_RGBA)
return false;
talloc_free(c->parts);
imgs->parts = c->parts = talloc_array(c, struct sub_bitmap, src.num_parts);
for (int n = 0; n < src.num_parts; n++) {
struct sub_bitmap *d = &imgs->parts[n];
struct sub_bitmap *s = &src.parts[n];
// add a transparent padding border to reduce artifacts
int pad = 5;
struct mp_image *temp = mp_image_alloc(IMGFMT_BGRA, s->w + pad * 2,
s->h + pad * 2);
memset_pic(temp->planes[0], 0, temp->w * 4, temp->h, temp->stride[0]);
uint8_t *p0 = temp->planes[0] + pad * 4 + pad * temp->stride[0];
memcpy_pic(p0, s->bitmap, s->w * 4, s->h, temp->stride[0], s->stride);
double sx = (double)s->dw / s->w;
double sy = (double)s->dh / s->h;
d->x = s->x - pad * sx;
d->y = s->y - pad * sy;
d->w = d->dw = s->dw + pad * 2 * sx;
d->h = d->dh = s->dh + pad * 2 * sy;
struct mp_image *image = mp_image_alloc(IMGFMT_BGRA, d->w, d->h);
talloc_steal(c->parts, image);
d->stride = image->stride[0];
d->bitmap = image->planes[0];
mp_image_sw_blur_scale(image, temp, gblur);
talloc_free(temp);
}
return true;
}
// If RGBA parts need scaling, scale them.
bool osd_scale_rgba(struct osd_conv_cache *c, struct sub_bitmaps *imgs)
{
struct sub_bitmaps src = *imgs;
if (src.format != SUBBITMAP_RGBA)
return false;
bool need_scale = false;
for (int n = 0; n < src.num_parts; n++) {
struct sub_bitmap *sb = &src.parts[n];
if (sb->w != sb->dw || sb->h != sb->dh)
need_scale = true;
}
if (!need_scale)
return false;
talloc_free(c->parts);
imgs->parts = c->parts = talloc_array(c, struct sub_bitmap, src.num_parts);
// Note: we scale all parts, since most likely all need scaling anyway, and
// to get a proper copy of all data in the imgs list.
for (int n = 0; n < src.num_parts; n++) {
struct sub_bitmap *d = &imgs->parts[n];
struct sub_bitmap *s = &src.parts[n];
struct mp_image src_image = {0};
mp_image_setfmt(&src_image, IMGFMT_BGRA);
mp_image_set_size(&src_image, s->w, s->h);
src_image.planes[0] = s->bitmap;
src_image.stride[0] = s->stride;
d->x = s->x;
d->y = s->y;
d->w = d->dw = s->dw;
d->h = d->dh = s->dh;
struct mp_image *image = mp_image_alloc(IMGFMT_BGRA, d->w, d->h);
talloc_steal(c->parts, image);
d->stride = image->stride[0];
d->bitmap = image->planes[0];
mp_image_swscale(image, &src_image, mp_sws_fast_flags);
}
return true;
}
static void rgba_to_gray(uint32_t *colors, size_t count)
{
for (int n = 0; n < count; n++) {
uint32_t c = colors[n];
int b = c & 0xFF;
int g = (c >> 8) & 0xFF;
int r = (c >> 16) & 0xFF;
int a = (c >> 24) & 0xFF;
r = g = b = (r + g + b) / 3;
colors[n] = b | (g << 8) | (r << 16) | (a << 24);
}
}
bool osd_conv_idx_to_gray(struct osd_conv_cache *c, struct sub_bitmaps *imgs)
{
struct sub_bitmaps src = *imgs;
if (src.format != SUBBITMAP_INDEXED)
return false;
talloc_free(c->parts);
imgs->parts = c->parts = talloc_array(c, struct sub_bitmap, src.num_parts);
for (int n = 0; n < src.num_parts; n++) {
struct sub_bitmap *d = &imgs->parts[n];
struct sub_bitmap *s = &src.parts[n];
struct osd_bmp_indexed sb = *(struct osd_bmp_indexed *)s->bitmap;
rgba_to_gray(sb.palette, 256);
*d = *s;
d->bitmap = talloc_memdup(c->parts, &sb, sizeof(sb));
}
return true;
}
static void draw_ass_rgba(unsigned char *src, int src_w, int src_h,
int src_stride, unsigned char *dst, size_t dst_stride,
int dst_x, int dst_y, uint32_t color)
{
const unsigned int r = (color >> 24) & 0xff;
const unsigned int g = (color >> 16) & 0xff;
const unsigned int b = (color >> 8) & 0xff;
const unsigned int a = 0xff - (color & 0xff);
dst += dst_y * dst_stride + dst_x * 4;
for (int y = 0; y < src_h; y++, dst += dst_stride, src += src_stride) {
uint32_t *dstrow = (uint32_t *) dst;
for (int x = 0; x < src_w; x++) {
const unsigned int v = src[x];
int rr = (r * a * v);
int gg = (g * a * v);
int bb = (b * a * v);
int aa = a * v;
uint32_t dstpix = dstrow[x];
unsigned int dstb = dstpix & 0xFF;
unsigned int dstg = (dstpix >> 8) & 0xFF;
unsigned int dstr = (dstpix >> 16) & 0xFF;
unsigned int dsta = (dstpix >> 24) & 0xFF;
dstb = (bb + dstb * (255 * 255 - aa)) / (255 * 255);
dstg = (gg + dstg * (255 * 255 - aa)) / (255 * 255);
dstr = (rr + dstr * (255 * 255 - aa)) / (255 * 255);
dsta = (aa * 255 + dsta * (255 * 255 - aa)) / (255 * 255);
dstrow[x] = dstb | (dstg << 8) | (dstr << 16) | (dsta << 24);
}
}
}
bool osd_conv_ass_to_rgba(struct osd_conv_cache *c, struct sub_bitmaps *imgs)
{
struct sub_bitmaps src = *imgs;
if (src.format != SUBBITMAP_LIBASS)
return false;
assert(!src.scaled); // ASS is always unscaled
struct mp_rect bb_list[MP_SUB_BB_LIST_MAX];
int num_bb = mp_get_sub_bb_list(&src, bb_list, MP_SUB_BB_LIST_MAX);
imgs->format = SUBBITMAP_RGBA;
imgs->parts = c->part;
imgs->num_parts = num_bb;
size_t newsize = 0;
for (int n = 0; n < num_bb; n++) {
struct mp_rect bb = bb_list[n];
int w = bb.x1 - bb.x0;
int h = bb.y1 - bb.y0;
int stride = w * 4;
newsize += h * stride;
}
if (talloc_get_size(c->scratch) < newsize) {
talloc_free(c->scratch);
c->scratch = talloc_array(c, uint8_t, newsize);
}
uint8_t *data = c->scratch;
for (int n = 0; n < num_bb; n++) {
struct mp_rect bb = bb_list[n];
struct sub_bitmap *bmp = &c->part[n];
bmp->x = bb.x0;
bmp->y = bb.y0;
bmp->w = bmp->dw = bb.x1 - bb.x0;
bmp->h = bmp->dh = bb.y1 - bb.y0;
bmp->stride = bmp->w * 4;
bmp->bitmap = data;
data += bmp->h * bmp->stride;
memset_pic(bmp->bitmap, 0, bmp->w * 4, bmp->h, bmp->stride);
for (int p = 0; p < src.num_parts; p++) {
struct sub_bitmap *s = &src.parts[p];
// Assume mp_get_sub_bb_list() never splits sub bitmaps
// So we don't clip/adjust the size of the sub bitmap
if (s->x > bb.x1 || s->x + s->w < bb.x0 ||
s->y > bb.y1 || s->y + s->h < bb.y0)
continue;
draw_ass_rgba(s->bitmap, s->w, s->h, s->stride,
bmp->bitmap, bmp->stride,
s->x - bb.x0, s->y - bb.y0,
s->libass.color);
}
}
return true;
}
bool mp_sub_bitmaps_bb(struct sub_bitmaps *imgs, struct mp_rect *out_bb)
{
struct mp_rect bb = {INT_MAX, INT_MAX, INT_MIN, INT_MIN};
for (int n = 0; n < imgs->num_parts; n++) {
struct sub_bitmap *p = &imgs->parts[n];
bb.x0 = FFMIN(bb.x0, p->x);
bb.y0 = FFMIN(bb.y0, p->y);
bb.x1 = FFMAX(bb.x1, p->x + p->dw);
bb.y1 = FFMAX(bb.y1, p->y + p->dh);
}
// avoid degenerate bounding box if empty
bb.x0 = FFMIN(bb.x0, bb.x1);
bb.y0 = FFMIN(bb.y0, bb.y1);
*out_bb = bb;
return bb.x0 < bb.x1 && bb.y0 < bb.y1;
}
// Merge bounding rectangles if they're closer than the given amount of pixels.
// Avoids having too many rectangles due to spacing between letter.
#define MERGE_RC_PIXELS 50
static void remove_intersecting_rcs(struct mp_rect *list, int *count)
{
int M = MERGE_RC_PIXELS;
bool changed = true;
while (changed) {
changed = false;
for (int a = 0; a < *count; a++) {
struct mp_rect *rc_a = &list[a];
for (int b = *count - 1; b > a; b--) {
struct mp_rect *rc_b = &list[b];
if (rc_a->x0 - M <= rc_b->x1 && rc_a->x1 + M >= rc_b->x0 &&
rc_a->y0 - M <= rc_b->y1 && rc_a->y1 + M >= rc_b->y0)
{
mp_rect_union(rc_a, rc_b);
MP_TARRAY_REMOVE_AT(list, *count, b);
changed = true;
}
}
}
}
}
// Cluster the given subrectangles into a small numbers of bounding rectangles,
// and store them into list. E.g. when subtitles and toptitles are visible at
// the same time, there should be two bounding boxes, so that the video between
// the text is left untouched (need to resample less pixels -> faster).
// Returns number of rectangles added to out_rc_list (<= rc_list_count)
// NOTE: some callers assume that sub bitmaps are never split or partially
// covered by returned rectangles.
int mp_get_sub_bb_list(struct sub_bitmaps *sbs, struct mp_rect *out_rc_list,
int rc_list_count)
{
int M = MERGE_RC_PIXELS;
int num_rc = 0;
for (int n = 0; n < sbs->num_parts; n++) {
struct sub_bitmap *sb = &sbs->parts[n];
struct mp_rect bb = {sb->x, sb->y, sb->x + sb->dw, sb->y + sb->dh};
bool intersects = false;
for (int r = 0; r < num_rc; r++) {
struct mp_rect *rc = &out_rc_list[r];
if ((bb.x0 - M <= rc->x1 && bb.x1 + M >= rc->x0 &&
bb.y0 - M <= rc->y1 && bb.y1 + M >= rc->y0) ||
num_rc == rc_list_count)
{
mp_rect_union(rc, &bb);
intersects = true;
break;
}
}
if (!intersects) {
out_rc_list[num_rc++] = bb;
remove_intersecting_rcs(out_rc_list, &num_rc);
}
}
remove_intersecting_rcs(out_rc_list, &num_rc);
return num_rc;
}
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