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mpv/sub/draw_bmp.c

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/*
* This file is part of mpv.
*
* mpv is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stddef.h>
#include <stdbool.h>
#include <assert.h>
#include <math.h>
#include <inttypes.h>
#include "common/common.h"
#include "draw_bmp.h"
#include "img_convert.h"
#include "video/mp_image.h"
#include "video/repack.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 part {
int change_id;
// Sub-bitmaps scaled to final sizes.
int num_imgs;
struct mp_image **imgs;
};
// Must be a power of 2. Height is 1, but mark_rect() effectively operates on
// multiples of chroma sized macro-pixels. (E.g. 4:2:0 -> every second line is
// the same as the previous one, and x0%2==x1%2==0.)
#define SLICE_W 256u
// Whether to scale in tiles. Faster, but can't use correct chroma position.
// Should be a runtime option. SLICE_W is used as tile width. The tile size
// should probably be small; too small or too big will cause overhead when
// scaling.
#define SCALE_IN_TILES 1
#define TILE_H 4u
struct slice {
uint16_t x0, x1;
};
struct mp_draw_sub_cache
{
struct mpv_global *global;
// Possibly cached parts. Also implies what's in the video_overlay.
struct part parts[MAX_OSD_PARTS];
int64_t change_id;
struct mp_image_params params; // target image params
int w, h; // like params.w/h, but rounded up to chroma
unsigned align_x, align_y; // alignment for all video pixels
struct mp_image *rgba_overlay; // all OSD in RGBA
struct mp_image *video_overlay; // rgba_overlay converted to video colorspace
struct mp_image *alpha_overlay; // alpha plane ref. to video_overlay
struct mp_image *calpha_overlay; // alpha_overlay scaled to chroma plane size
unsigned s_w; // number of slices per line
struct slice *slices; // slices[y * s_w + x / SLICE_W]
bool any_osd;
struct mp_sws_context *rgba_to_overlay; // scaler for rgba -> video csp.
struct mp_sws_context *alpha_to_calpha; // scaler for overlay -> calpha
bool scale_in_tiles;
struct mp_sws_context *sub_scale; // scaler for SUBBITMAP_RGBA
struct mp_repack *overlay_to_f32; // convert video_overlay to float
struct mp_image *overlay_tmp; // slice in float32
struct mp_repack *calpha_to_f32; // convert video_overlay to float
struct mp_image *calpha_tmp; // slice in float32
struct mp_repack *video_to_f32; // convert video to float
struct mp_repack *video_from_f32; // convert float back to video
struct mp_image *video_tmp; // slice in float32
struct mp_sws_context *premul; // video -> premultiplied video
struct mp_sws_context *unpremul; // reverse
struct mp_image *premul_tmp;
// Function that works on the _f32 data.
void (*blend_line)(void *dst, void *src, void *src_a, int w);
struct mp_image res_overlay; // returned by mp_draw_sub_overlay()
};
static void blend_line_f32(void *dst, void *src, void *src_a, int w)
{
float *dst_f = dst;
float *src_f = src;
float *src_a_f = src_a;
for (int x = 0; x < w; x++)
dst_f[x] = src_f[x] + dst_f[x] * (1.0f - src_a_f[x]);
}
static void blend_line_u8(void *dst, void *src, void *src_a, int w)
{
uint8_t *dst_i = dst;
uint8_t *src_i = src;
uint8_t *src_a_i = src_a;
for (int x = 0; x < w; x++)
dst_i[x] = src_i[x] + dst_i[x] * (255u - src_a_i[x]) / 255u;
}
static void blend_slice(struct mp_draw_sub_cache *p)
{
struct mp_image *ov = p->overlay_tmp;
struct mp_image *ca = p->calpha_tmp;
struct mp_image *vid = p->video_tmp;
for (int plane = 0; plane < vid->num_planes; plane++) {
int xs = vid->fmt.xs[plane];
int ys = vid->fmt.ys[plane];
int h = (1 << vid->fmt.chroma_ys) - (1 << ys) + 1;
int cw = mp_chroma_div_up(vid->w, xs);
for (int y = 0; y < h; y++) {
p->blend_line(mp_image_pixel_ptr_ny(vid, plane, 0, y),
mp_image_pixel_ptr_ny(ov, plane, 0, y),
xs || ys ? mp_image_pixel_ptr_ny(ca, 0, 0, y)
: mp_image_pixel_ptr_ny(ov, ov->num_planes - 1, 0, y),
cw);
}
}
}
static bool blend_overlay_with_video(struct mp_draw_sub_cache *p,
struct mp_image *dst)
{
if (!repack_config_buffers(p->video_to_f32, 0, p->video_tmp, 0, dst, NULL))
return false;
if (!repack_config_buffers(p->video_from_f32, 0, dst, 0, p->video_tmp, NULL))
return false;
int xs = dst->fmt.chroma_xs;
int ys = dst->fmt.chroma_ys;
for (int y = 0; y < dst->h; y += p->align_y) {
struct slice *line = &p->slices[y * p->s_w];
for (int sx = 0; sx < p->s_w; sx++) {
struct slice *s = &line[sx];
int w = s->x1 - s->x0;
if (w <= 0)
continue;
int x = sx * SLICE_W + s->x0;
assert(MP_IS_ALIGNED(x, p->align_x));
assert(MP_IS_ALIGNED(w, p->align_x));
assert(x + w <= p->w);
repack_line(p->overlay_to_f32, 0, 0, x, y, w);
repack_line(p->video_to_f32, 0, 0, x, y, w);
if (p->calpha_to_f32)
repack_line(p->calpha_to_f32, 0, 0, x >> xs, y >> ys, w >> xs);
blend_slice(p);
repack_line(p->video_from_f32, x, y, 0, 0, w);
}
}
return true;
}
static bool convert_overlay_part(struct mp_draw_sub_cache *p,
int x0, int y0, int w, int h)
{
struct mp_image src = *p->rgba_overlay;
struct mp_image dst = *p->video_overlay;
mp_image_crop(&src, x0, y0, x0 + w, y0 + h);
mp_image_crop(&dst, x0, y0, x0 + w, y0 + h);
if (mp_sws_scale(p->rgba_to_overlay, &dst, &src) < 0)
return false;
if (p->calpha_overlay) {
src = *p->alpha_overlay;
dst = *p->calpha_overlay;
int xs = p->video_overlay->fmt.chroma_xs;
int ys = p->video_overlay->fmt.chroma_ys;
mp_image_crop(&src, x0, y0, x0 + w, y0 + h);
mp_image_crop(&dst, x0 >> xs, y0 >> ys, (x0 + w) >> xs, (y0 + h) >> ys);
if (mp_sws_scale(p->alpha_to_calpha, &dst, &src) < 0)
return false;
}
return true;
}
static bool convert_to_video_overlay(struct mp_draw_sub_cache *p)
{
if (!p->video_overlay)
return true;
if (p->scale_in_tiles) {
int t_h = p->rgba_overlay->h / TILE_H;
for (int ty = 0; ty < t_h; ty++) {
for (int sx = 0; sx < p->s_w; sx++) {
struct slice *s = &p->slices[ty * TILE_H * p->s_w + sx];
bool pixels_set = false;
for (int y = 0; y < TILE_H; y++) {
if (s[0].x0 < s[0].x1) {
pixels_set = true;
break;
}
s += p->s_w;
}
if (!pixels_set)
continue;
if (!convert_overlay_part(p, sx * SLICE_W, ty * TILE_H,
SLICE_W, TILE_H))
return false;
}
}
} else {
if (!convert_overlay_part(p, 0, 0, p->rgba_overlay->w, p->rgba_overlay->h))
return false;
}
return true;
}
// Mark the given rectangle of pixels as possibly non-transparent.
// The rectangle must have been pre-clipped.
static void mark_rect(struct mp_draw_sub_cache *p, int x0, int y0, int x1, int y1)
{
x0 = MP_ALIGN_DOWN(x0, p->align_x);
y0 = MP_ALIGN_DOWN(y0, p->align_y);
x1 = MP_ALIGN_UP(x1, p->align_x);
y1 = MP_ALIGN_UP(y1, p->align_y);
assert(x0 >= 0 && x0 <= x1 && x1 <= p->w);
assert(y0 >= 0 && y0 <= y1 && y1 <= p->h);
int sx0 = x0 / SLICE_W;
int sx1 = x1 / SLICE_W;
for (int y = y0; y < y1; y++) {
struct slice *line = &p->slices[y * p->s_w];
struct slice *s0 = &line[sx0];
struct slice *s1 = &line[sx1];
s0->x0 = MPMIN(s0->x0, x0 % SLICE_W);
s1->x1 = MPMAX(s1->x1, x1 % SLICE_W);
if (s0 != s1) {
s0->x1 = SLICE_W;
s1->x0 = 0;
for (int x = sx0 + 1; x < sx1; x++) {
struct slice *s = &line[x];
s->x0 = 0;
s->x1 = SLICE_W;
}
}
p->any_osd = true;
}
}
static void draw_ass_rgba(uint8_t *dst, ptrdiff_t dst_stride,
uint8_t *src, ptrdiff_t src_stride,
int w, int h, 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);
for (int y = 0; y < h; y++) {
uint32_t *dstrow = (uint32_t *) dst;
for (int x = 0; x < w; x++) {
const unsigned int v = src[x];
unsigned 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 = (v * b * a + dstb * (255 * 255 - aa)) / (255 * 255);
dstg = (v * g * a + dstg * (255 * 255 - aa)) / (255 * 255);
dstr = (v * r * a + dstr * (255 * 255 - aa)) / (255 * 255);
dsta = (aa * 255 + dsta * (255 * 255 - aa)) / (255 * 255);
dstrow[x] = dstb | (dstg << 8) | (dstr << 16) | (dsta << 24);
}
dst += dst_stride;
src += src_stride;
}
}
static void render_ass(struct mp_draw_sub_cache *p, struct sub_bitmaps *sb)
{
assert(sb->format == SUBBITMAP_LIBASS);
for (int i = 0; i < sb->num_parts; i++) {
struct sub_bitmap *s = &sb->parts[i];
draw_ass_rgba(mp_image_pixel_ptr(p->rgba_overlay, 0, s->x, s->y),
p->rgba_overlay->stride[0], s->bitmap, s->stride,
s->w, s->h, s->libass.color);
mark_rect(p, s->x, s->y, s->x + s->w, s->y + s->h);
}
}
static void draw_rgba(uint8_t *dst, ptrdiff_t dst_stride,
uint8_t *src, ptrdiff_t src_stride, int w, int h)
{
for (int y = 0; y < h; y++) {
uint32_t *srcrow = (uint32_t *)src;
uint32_t *dstrow = (uint32_t *)dst;
for (int x = 0; x < w; x++) {
uint32_t srcpix = srcrow[x];
uint32_t dstpix = dstrow[x];
unsigned int srcb = srcpix & 0xFF;
unsigned int srcg = (srcpix >> 8) & 0xFF;
unsigned int srcr = (srcpix >> 16) & 0xFF;
unsigned int srca = (srcpix >> 24) & 0xFF;
unsigned int dstb = dstpix & 0xFF;
unsigned int dstg = (dstpix >> 8) & 0xFF;
unsigned int dstr = (dstpix >> 16) & 0xFF;
unsigned int dsta = (dstpix >> 24) & 0xFF;
dstb = srcb + dstb * (255 * 255 - srca) / (255 * 255);
dstg = srcg + dstg * (255 * 255 - srca) / (255 * 255);
dstr = srcr + dstr * (255 * 255 - srca) / (255 * 255);
dsta = srca + dsta * (255 * 255 - srca) / (255 * 255);
dstrow[x] = dstb | (dstg << 8) | (dstr << 16) | (dsta << 24);
}
dst += dst_stride;
src += src_stride;
}
}
static bool render_rgba(struct mp_draw_sub_cache *p, struct part *part,
struct sub_bitmaps *sb)
{
assert(sb->format == SUBBITMAP_RGBA);
if (part->change_id != sb->change_id) {
for (int n = 0; n < part->num_imgs; n++)
talloc_free(part->imgs[n]);
part->num_imgs = sb->num_parts;
MP_TARRAY_GROW(p, part->imgs, part->num_imgs);
for (int n = 0; n < part->num_imgs; n++)
part->imgs[n] = NULL;
part->change_id = sb->change_id;
}
for (int i = 0; i < sb->num_parts; i++) {
struct sub_bitmap *s = &sb->parts[i];
// Clipping is rare but necessary.
int sx0 = s->x;
int sy0 = s->y;
int sx1 = s->x + s->dw;
int sy1 = s->y + s->dh;
int x0 = MPCLAMP(sx0, 0, p->w);
int y0 = MPCLAMP(sy0, 0, p->h);
int x1 = MPCLAMP(sx1, 0, p->w);
int y1 = MPCLAMP(sy1, 0, p->h);
int dw = x1 - x0;
int dh = y1 - y0;
if (dw <= 0 || dh <= 0)
continue;
// We clip the source instead of the scaled image, because that might
// avoid excessive memory usage when applying a ridiculous scale factor,
// even if that stretches it to up to 1 pixel due to integer rounding.
int sx = 0;
int sy = 0;
int sw = s->w;
int sh = s->h;
if (x0 != sx0 || y0 != sy0 || x1 != sx1 || y1 != sy1) {
double fx = s->dw / (double)s->w;
double fy = s->dh / (double)s->h;
sx = MPCLAMP((x0 - sx0) / fx, 0, s->w);
sy = MPCLAMP((y0 - sy0) / fy, 0, s->h);
sw = MPCLAMP(dw / fx, 1, s->w);
sh = MPCLAMP(dh / fy, 1, s->h);
}
assert(sx >= 0 && sw > 0 && sx + sw <= s->w);
assert(sy >= 0 && sh > 0 && sy + sh <= s->h);
ptrdiff_t s_stride = s->stride;
void *s_ptr = (char *)s->bitmap + s_stride * sy + sx * 4;
if (dw != sw || dh != sh) {
struct mp_image *scaled = part->imgs[i];
if (!scaled) {
struct mp_image src_img = {0};
mp_image_setfmt(&src_img, IMGFMT_BGRA);
mp_image_set_size(&src_img, sw, sh);
src_img.planes[0] = s_ptr;
src_img.stride[0] = s_stride;
src_img.params.alpha = MP_ALPHA_PREMUL;
scaled = mp_image_alloc(IMGFMT_BGRA, dw, dh);
if (!scaled)
return false;
part->imgs[i] = talloc_steal(p, scaled);
mp_image_copy_attributes(scaled, &src_img);
if (mp_sws_scale(p->sub_scale, scaled, &src_img) < 0)
return false;
}
assert(scaled->w == dw);
assert(scaled->h == dh);
s_stride = scaled->stride[0];
s_ptr = scaled->planes[0];
}
draw_rgba(mp_image_pixel_ptr(p->rgba_overlay, 0, x0, y0),
p->rgba_overlay->stride[0], s_ptr, s_stride, dw, dh);
mark_rect(p, x0, y0, x1, y1);
}
return true;
}
static bool render_sb(struct mp_draw_sub_cache *p, struct sub_bitmaps *sb)
{
struct part *part = &p->parts[sb->render_index];
switch (sb->format) {
case SUBBITMAP_LIBASS:
render_ass(p, sb);
return true;
case SUBBITMAP_RGBA:
return render_rgba(p, part, sb);
}
return false;
}
static void clear_rgba_overlay(struct mp_draw_sub_cache *p)
{
assert(p->rgba_overlay->imgfmt == IMGFMT_BGRA);
for (int y = 0; y < p->rgba_overlay->h; y++) {
uint32_t *px = mp_image_pixel_ptr(p->rgba_overlay, 0, 0, y);
struct slice *line = &p->slices[y * p->s_w];
for (int sx = 0; sx < p->s_w; sx++) {
struct slice *s = &line[sx];
if (s->x0 <= s->x1) {
memset(px + s->x0, 0, (s->x1 - s->x0) * 4);
*s = (struct slice){SLICE_W, 0};
}
px += SLICE_W;
}
}
p->any_osd = false;
}
static struct mp_sws_context *alloc_scaler(struct mp_draw_sub_cache *p)
{
struct mp_sws_context *s = mp_sws_alloc(p);
mp_sws_enable_cmdline_opts(s, p->global);
return s;
}
static void init_general(struct mp_draw_sub_cache *p)
{
p->sub_scale = alloc_scaler(p);
p->s_w = MP_ALIGN_UP(p->rgba_overlay->w, SLICE_W) / SLICE_W;
p->slices = talloc_zero_array(p, struct slice, p->s_w * p->rgba_overlay->h);
mp_image_clear(p->rgba_overlay, 0, 0, p->w, p->h);
clear_rgba_overlay(p);
}
static bool reinit_to_video(struct mp_draw_sub_cache *p)
{
struct mp_image_params *params = &p->params;
mp_image_params_guess_csp(params);
bool need_premul = params->alpha != MP_ALPHA_PREMUL &&
(mp_imgfmt_get_desc(params->imgfmt).flags & MP_IMGFLAG_ALPHA);
// Intermediate format for video_overlay. Requirements:
// - same subsampling as video
// - uses video colorspace
// - has alpha
// - repacker support (to the format used in p->blend_line)
// - probably 8 bit per component rather than something wasteful or strange
struct mp_regular_imgfmt vfdesc = {0};
int rflags = REPACK_CREATE_EXPAND_8BIT;
bool use_shortcut = false;
p->video_to_f32 = mp_repack_create_planar(params->imgfmt, false, rflags);
talloc_steal(p, p->video_to_f32);
if (!p->video_to_f32)
return false;
mp_get_regular_imgfmt(&vfdesc, mp_repack_get_format_dst(p->video_to_f32));
assert(vfdesc.num_planes); // must have succeeded
if (params->color.space == MP_CSP_RGB && vfdesc.num_planes >= 3) {
use_shortcut = true;
if (vfdesc.component_type == MP_COMPONENT_TYPE_UINT &&
vfdesc.component_size == 1 && vfdesc.component_pad == 0)
p->blend_line = blend_line_u8;
}
// If no special blender is available, blend in float.
if (!p->blend_line) {
TA_FREEP(&p->video_to_f32);
rflags |= REPACK_CREATE_PLANAR_F32;
p->video_to_f32 = mp_repack_create_planar(params->imgfmt, false, rflags);
talloc_steal(p, p->video_to_f32);
if (!p->video_to_f32)
return false;
mp_get_regular_imgfmt(&vfdesc, mp_repack_get_format_dst(p->video_to_f32));
assert(vfdesc.component_type == MP_COMPONENT_TYPE_FLOAT);
p->blend_line = blend_line_f32;
}
p->scale_in_tiles = SCALE_IN_TILES;
int vid_f32_fmt = mp_repack_get_format_dst(p->video_to_f32);
p->video_from_f32 = mp_repack_create_planar(params->imgfmt, true, rflags);
talloc_steal(p, p->video_from_f32);
if (!p->video_from_f32)
return false;
assert(mp_repack_get_format_dst(p->video_to_f32) ==
mp_repack_get_format_src(p->video_from_f32));
int overlay_fmt = 0;
if (use_shortcut) {
// No point in doing anything fancy.
overlay_fmt = IMGFMT_BGRA;
p->scale_in_tiles = false;
} else {
struct mp_regular_imgfmt odesc = vfdesc;
// Just use 8 bit as well (should be fine, may use less memory).
odesc.component_type = MP_COMPONENT_TYPE_UINT;
odesc.component_size = 1;
odesc.component_pad = 0;
// Ensure there's alpha.
if (odesc.planes[odesc.num_planes - 1].components[0] != 4) {
if (odesc.num_planes >= 4)
return false; // wat
odesc.planes[odesc.num_planes++] =
(struct mp_regular_imgfmt_plane){1, {4}};
}
overlay_fmt = mp_find_regular_imgfmt(&odesc);
p->scale_in_tiles = odesc.chroma_xs || odesc.chroma_ys;
}
if (!overlay_fmt)
return false;
p->overlay_to_f32 = mp_repack_create_planar(overlay_fmt, false, rflags);
talloc_steal(p, p->overlay_to_f32);
if (!p->overlay_to_f32)
return false;
int render_fmt = mp_repack_get_format_dst(p->overlay_to_f32);
struct mp_regular_imgfmt ofdesc = {0};
mp_get_regular_imgfmt(&ofdesc, render_fmt);
if (ofdesc.planes[ofdesc.num_planes - 1].components[0] != 4)
return false;
// The formats must be the same, minus possible lack of alpha in vfdesc.
if (ofdesc.num_planes != vfdesc.num_planes &&
ofdesc.num_planes - 1 != vfdesc.num_planes)
return false;
for (int n = 0; n < vfdesc.num_planes; n++) {
if (vfdesc.planes[n].components[0] != ofdesc.planes[n].components[0])
return false;
}
p->align_x = mp_repack_get_align_x(p->video_to_f32);
p->align_y = mp_repack_get_align_y(p->video_to_f32);
assert(p->align_x >= mp_repack_get_align_x(p->overlay_to_f32));
assert(p->align_y >= mp_repack_get_align_y(p->overlay_to_f32));
if (p->align_x > SLICE_W || p->align_y > TILE_H)
return false;
p->w = MP_ALIGN_UP(params->w, p->align_x);
int slice_h = p->align_y;
p->h = MP_ALIGN_UP(params->h, slice_h);
// Size of the overlay. If scaling in tiles, round up to tiles, so we don't
// need to reinit the scale for right/bottom tiles.
int w = p->w;
int h = p->h;
if (p->scale_in_tiles) {
w = MP_ALIGN_UP(w, SLICE_W);
h = MP_ALIGN_UP(h, TILE_H);
}
p->rgba_overlay = talloc_steal(p, mp_image_alloc(IMGFMT_BGRA, w, h));
p->overlay_tmp = talloc_steal(p, mp_image_alloc(render_fmt, SLICE_W, slice_h));
p->video_tmp = talloc_steal(p, mp_image_alloc(vid_f32_fmt, SLICE_W, slice_h));
if (!p->rgba_overlay || !p->overlay_tmp || !p->video_tmp)
return false;
mp_image_params_guess_csp(&p->rgba_overlay->params);
p->rgba_overlay->params.alpha = MP_ALPHA_PREMUL;
p->overlay_tmp->params.color = params->color;
p->video_tmp->params.color = params->color;
if (p->rgba_overlay->imgfmt == overlay_fmt) {
if (!repack_config_buffers(p->overlay_to_f32, 0, p->overlay_tmp,
0, p->rgba_overlay, NULL))
return false;
} else {
// Generally non-RGB.
p->video_overlay = talloc_steal(p, mp_image_alloc(overlay_fmt, w, h));
if (!p->video_overlay)
return false;
p->video_overlay->params.color = params->color;
p->video_overlay->params.chroma_location = params->chroma_location;
p->video_overlay->params.alpha = MP_ALPHA_PREMUL;
if (p->scale_in_tiles)
p->video_overlay->params.chroma_location = MP_CHROMA_CENTER;
p->rgba_to_overlay = alloc_scaler(p);
p->rgba_to_overlay->allow_zimg = true;
if (!mp_sws_supports_formats(p->rgba_to_overlay,
p->video_overlay->imgfmt, p->rgba_overlay->imgfmt))
return false;
if (!repack_config_buffers(p->overlay_to_f32, 0, p->overlay_tmp,
0, p->video_overlay, NULL))
return false;
// Setup a scaled alpha plane if chroma-subsampling is present.
int xs = p->video_overlay->fmt.chroma_xs;
int ys = p->video_overlay->fmt.chroma_ys;
if (xs || ys) {
// Require float so format selection becomes simpler (maybe).
assert(rflags & REPACK_CREATE_PLANAR_F32);
// For extracting the alpha plane, construct a gray format that is
// compatible with the alpha one.
struct mp_regular_imgfmt odesc = {0};
mp_get_regular_imgfmt(&odesc, overlay_fmt);
assert(odesc.component_size);
int aplane = odesc.num_planes - 1;
assert(odesc.planes[aplane].num_components == 1);
assert(odesc.planes[aplane].components[0] == 4);
struct mp_regular_imgfmt cadesc = odesc;
cadesc.num_planes = 1;
cadesc.planes[0] = (struct mp_regular_imgfmt_plane){1, {1}};
cadesc.chroma_xs = cadesc.chroma_ys = 0;
int calpha_fmt = mp_find_regular_imgfmt(&cadesc);
if (!calpha_fmt)
return false;
// Unscaled alpha plane from p->video_overlay.
p->alpha_overlay = talloc_zero(p, struct mp_image);
mp_image_setfmt(p->alpha_overlay, calpha_fmt);
mp_image_set_size(p->alpha_overlay, w, h);
p->alpha_overlay->planes[0] = p->video_overlay->planes[aplane];
p->alpha_overlay->stride[0] = p->video_overlay->stride[aplane];
// Full range gray always has the same range as alpha.
p->alpha_overlay->params.color.levels = MP_CSP_LEVELS_PC;
mp_image_params_guess_csp(&p->alpha_overlay->params);
p->calpha_overlay =
talloc_steal(p, mp_image_alloc(calpha_fmt, w >> xs, h >> ys));
if (!p->calpha_overlay)
return false;
p->calpha_overlay->params.color = p->alpha_overlay->params.color;
p->calpha_to_f32 = mp_repack_create_planar(calpha_fmt, false, rflags);
talloc_steal(p, p->calpha_to_f32);
if (!p->calpha_to_f32)
return false;
int af32_fmt = mp_repack_get_format_dst(p->calpha_to_f32);
p->calpha_tmp = talloc_steal(p, mp_image_alloc(af32_fmt, SLICE_W, 1));
if (!p->calpha_tmp)
return false;
if (!repack_config_buffers(p->calpha_to_f32, 0, p->calpha_tmp,
0, p->calpha_overlay, NULL))
return false;
p->alpha_to_calpha = alloc_scaler(p);
if (!mp_sws_supports_formats(p->alpha_to_calpha,
calpha_fmt, calpha_fmt))
return false;
}
}
if (need_premul) {
p->premul = alloc_scaler(p);
p->unpremul = alloc_scaler(p);
p->premul_tmp = mp_image_alloc(params->imgfmt, params->w, params->h);
talloc_steal(p, p->premul_tmp);
if (!p->premul_tmp)
return false;
mp_image_set_params(p->premul_tmp, params);
p->premul_tmp->params.alpha = MP_ALPHA_PREMUL;
// Only zimg supports this.
p->premul->force_scaler = MP_SWS_ZIMG;
p->unpremul->force_scaler = MP_SWS_ZIMG;
}
init_general(p);
return true;
}
static bool reinit_to_overlay(struct mp_draw_sub_cache *p)
{
p->align_x = 1;
p->align_y = 1;
p->w = p->params.w;
p->h = p->params.h;
p->rgba_overlay = talloc_steal(p, mp_image_alloc(IMGFMT_BGRA, p->w, p->h));
if (!p->rgba_overlay)
return false;
mp_image_params_guess_csp(&p->rgba_overlay->params);
p->rgba_overlay->params.alpha = MP_ALPHA_PREMUL;
// Some non-sense with the intention to somewhat isolate the returned image.
mp_image_setfmt(&p->res_overlay, p->rgba_overlay->imgfmt);
mp_image_set_size(&p->res_overlay, p->rgba_overlay->w, p->rgba_overlay->h);
mp_image_copy_attributes(&p->res_overlay, p->rgba_overlay);
p->res_overlay.planes[0] = p->rgba_overlay->planes[0];
p->res_overlay.stride[0] = p->rgba_overlay->stride[0];
init_general(p);
// Mark all dirty (for full reinit of user state).
for (int y = 0; y < p->rgba_overlay->h; y++) {
for (int sx = 0; sx < p->s_w; sx++)
p->slices[y * p->s_w + sx] = (struct slice){0, SLICE_W};
}
return true;
}
static bool check_reinit(struct mp_draw_sub_cache *p,
struct mp_image_params *params, bool to_video)
{
if (!mp_image_params_equal(&p->params, params) || !p->rgba_overlay) {
talloc_free_children(p);
*p = (struct mp_draw_sub_cache){.global = p->global, .params = *params};
if (!(to_video ? reinit_to_video(p) : reinit_to_overlay(p))) {
talloc_free_children(p);
*p = (struct mp_draw_sub_cache){.global = p->global};
return false;
}
}
return true;
}
char *mp_draw_sub_get_dbg_info(struct mp_draw_sub_cache *p)
{
assert(p);
return talloc_asprintf(NULL,
"align=%d:%d ov=%-7s, ov_f=%s, v_f=%s, a=%s, ca=%s, ca_f=%s",
p->align_x, p->align_y,
mp_imgfmt_to_name(p->video_overlay ? p->video_overlay->imgfmt : 0),
mp_imgfmt_to_name(p->overlay_tmp->imgfmt),
mp_imgfmt_to_name(p->video_tmp->imgfmt),
mp_imgfmt_to_name(p->alpha_overlay ? p->alpha_overlay->imgfmt : 0),
mp_imgfmt_to_name(p->calpha_overlay ? p->calpha_overlay->imgfmt : 0),
mp_imgfmt_to_name(p->calpha_tmp ? p->calpha_tmp->imgfmt : 0));
}
struct mp_draw_sub_cache *mp_draw_sub_alloc(void *ta_parent, struct mpv_global *g)
{
struct mp_draw_sub_cache *c = talloc_zero(ta_parent, struct mp_draw_sub_cache);
c->global = g;
return c;
}
bool mp_draw_sub_bitmaps(struct mp_draw_sub_cache *p, struct mp_image *dst,
struct sub_bitmap_list *sbs_list)
{
bool ok = false;
// dst must at least be as large as the bounding box, or you may get memory
// corruption.
assert(dst->w >= sbs_list->w);
assert(dst->h >= sbs_list->h);
if (!check_reinit(p, &dst->params, true))
return false;
if (p->change_id != sbs_list->change_id) {
p->change_id = sbs_list->change_id;
clear_rgba_overlay(p);
for (int n = 0; n < sbs_list->num_items; n++) {
if (!render_sb(p, sbs_list->items[n]))
goto done;
}
if (!convert_to_video_overlay(p))
goto done;
}
if (p->any_osd) {
struct mp_image *target = dst;
if (p->premul_tmp) {
if (mp_sws_scale(p->premul, p->premul_tmp, dst) < 0)
goto done;
target = p->premul_tmp;
}
if (!blend_overlay_with_video(p, target))
goto done;
if (target != dst) {
if (mp_sws_scale(p->unpremul, dst, p->premul_tmp) < 0)
goto done;
}
}
ok = true;
done:
return ok;
}
// Bounding boxes for mp_draw_sub_overlay() API. For simplicity, each rectangle
// covers a fixed tile on the screen, starts out empty, but is not extended
// beyond the tile. In the simplest case, there's only 1 rect/tile for everything.
struct rc_grid {
unsigned w, h; // size in grid tiles
unsigned r_w, r_h; // size of a grid tile in pixels
struct mp_rect *rcs; // rcs[x * w + y]
};
static void init_rc_grid(struct rc_grid *gr, struct mp_draw_sub_cache *p,
struct mp_rect *rcs, int max_rcs)
{
*gr = (struct rc_grid){ .w = max_rcs ? 1 : 0, .h = max_rcs ? 1 : 0,
.rcs = rcs, .r_w = p->s_w * SLICE_W, .r_h = p->h, };
// Dumb iteration to figure out max. size because I'm stupid.
bool more = true;
while (more) {
more = false;
if (gr->r_h >= 128) {
if (gr->w * gr->h * 2 > max_rcs)
break;
gr->h *= 2;
gr->r_h = (p->h + gr->h - 1) / gr->h;
more = true;
}
if (gr->r_w >= SLICE_W * 2) {
if (gr->w * gr->h * 2 > max_rcs)
break;
gr->w *= 2;
gr->r_w = (p->s_w + gr->w - 1) / gr->w * SLICE_W;
more = true;
}
}
assert(gr->r_h * gr->h >= p->h);
assert(!(gr->r_w & (SLICE_W - 1)));
assert(gr->r_w * gr->w >= p->w);
// Init with empty (degenerate) rectangles.
for (int y = 0; y < gr->h; y++) {
for (int x = 0; x < gr->w; x++) {
struct mp_rect *rc = &gr->rcs[y * gr->w + x];
rc->x1 = x * gr->r_w;
rc->y1 = y * gr->r_h;
rc->x0 = rc->x1 + gr->r_w;
rc->y0 = rc->y1 + gr->r_h;
}
}
}
// Extend given grid with contents of p->slices.
static void mark_rcs(struct mp_draw_sub_cache *p, struct rc_grid *gr)
{
for (int y = 0; y < p->h; y++) {
struct slice *line = &p->slices[y * p->s_w];
struct mp_rect *rcs = &gr->rcs[y / gr->r_h * gr->w];
for (int sx = 0; sx < p->s_w; sx++) {
struct slice *s = &line[sx];
if (s->x0 < s->x1) {
unsigned xpos = sx * SLICE_W;
struct mp_rect *rc = &rcs[xpos / gr->r_w];
rc->y0 = MPMIN(rc->y0, y);
rc->y1 = MPMAX(rc->y1, y + 1);
rc->x0 = MPMIN(rc->x0, xpos + s->x0);
rc->x1 = MPMAX(rc->x1, xpos + s->x1);
}
}
}
}
// Remove empty RCs, and return rc count.
static int return_rcs(struct rc_grid *gr)
{
int num = 0, cnt = gr->w * gr->h;
for (int n = 0; n < cnt; n++) {
struct mp_rect *rc = &gr->rcs[n];
if (rc->x0 < rc->x1 && rc->y0 < rc->y1)
gr->rcs[num++] = *rc;
}
return num;
}
struct mp_image *mp_draw_sub_overlay(struct mp_draw_sub_cache *p,
struct sub_bitmap_list *sbs_list,
struct mp_rect *act_rcs,
int max_act_rcs,
int *num_act_rcs,
struct mp_rect *mod_rcs,
int max_mod_rcs,
int *num_mod_rcs)
{
*num_act_rcs = 0;
*num_mod_rcs = 0;
struct mp_image_params params = {.w = sbs_list->w, .h = sbs_list->h};
if (!check_reinit(p, &params, false))
return NULL;
struct rc_grid gr_act, gr_mod;
init_rc_grid(&gr_act, p, act_rcs, max_act_rcs);
init_rc_grid(&gr_mod, p, mod_rcs, max_mod_rcs);
if (p->change_id != sbs_list->change_id) {
p->change_id = sbs_list->change_id;
mark_rcs(p, &gr_mod);
clear_rgba_overlay(p);
for (int n = 0; n < sbs_list->num_items; n++) {
if (!render_sb(p, sbs_list->items[n])) {
p->change_id = 0;
return NULL;
}
}
mark_rcs(p, &gr_mod);
}
mark_rcs(p, &gr_act);
*num_act_rcs = return_rcs(&gr_act);
*num_mod_rcs = return_rcs(&gr_mod);
return &p->res_overlay;
}
// vim: ts=4 sw=4 et tw=80
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