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mpv/sub/img_convert.c
wm4 5d5ddb2ad0 sub: add --sub-gray option to display image subs in grayscale
MPlayer/mplayer2 still show DVD subtitles in gray. Depending on who you
ask, this can be considered a bug or a feature. Include rendering in
gray as explicit feature, so the user can decide what is better.

This affects all indexed sub bitmaps entering the OSD rendering path.
Currently, this means all image subs are affected by this option, but
nothing else.
2012-11-25 23:40:07 +01:00

166 lines
5.0 KiB
C

/*
* 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;
struct sub_bitmap *parts;
};
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 = alloc_mpi(s->w, s->h, IMGFMT_BGRA);
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 = alloc_mpi(s->w + pad * 2, s->h + pad * 2,
IMGFMT_BGRA);
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 = alloc_mpi(d->w, d->h, IMGFMT_BGRA);
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;
}
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;
}