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https://github.com/xenia-project/FFmpeg.git
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drawutils: implement uniform and mask blending.
This commit is contained in:
Nicolas George
parent
e3e89b6d8b
commit
e8497a338e
@ -132,6 +132,8 @@ int ff_draw_init(FFDrawContext *draw, enum PixelFormat format, unsigned flags)
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unsigned i, nb_planes = 0;
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int pixelstep[MAX_PLANES] = { 0 };
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if (!desc->name)
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return AVERROR(EINVAL);
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if (desc->flags & ~(PIX_FMT_PLANAR | PIX_FMT_RGB))
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return AVERROR(ENOSYS);
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for (i = 0; i < desc->nb_components; i++) {
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@ -146,6 +148,8 @@ int ff_draw_init(FFDrawContext *draw, enum PixelFormat format, unsigned flags)
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pixelstep[c->plane] != c->step_minus1 + 1)
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return AVERROR(ENOSYS);
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pixelstep[c->plane] = c->step_minus1 + 1;
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if (pixelstep[c->plane] >= 8)
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return AVERROR(ENOSYS);
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nb_planes = FFMAX(nb_planes, c->plane + 1);
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}
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if ((desc->log2_chroma_w || desc->log2_chroma_h) && nb_planes < 3)
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@ -159,6 +163,9 @@ int ff_draw_init(FFDrawContext *draw, enum PixelFormat format, unsigned flags)
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draw->hsub[1] = draw->hsub[2] = draw->hsub_max = desc->log2_chroma_w;
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draw->vsub[1] = draw->vsub[2] = draw->vsub_max = desc->log2_chroma_h;
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}
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for (i = 0; i < ((desc->nb_components - 1) | 1); i++)
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draw->comp_mask[desc->comp[i].plane] |=
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1 << (desc->comp[i].offset_plus1 - 1);
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return 0;
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}
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@ -167,6 +174,8 @@ void ff_draw_color(FFDrawContext *draw, FFDrawColor *color, uint8_t rgba[4])
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unsigned i;
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uint8_t rgba_map[4];
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if (rgba != color->rgba)
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memcpy(color->rgba, rgba, sizeof(color->rgba));
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if ((draw->desc->flags & PIX_FMT_RGB) && draw->nb_planes == 1 &&
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ff_fill_rgba_map(rgba_map, draw->format) >= 0) {
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for (i = 0; i < 4; i++)
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@ -246,6 +255,231 @@ void ff_fill_rectangle(FFDrawContext *draw, FFDrawColor *color,
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}
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}
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/**
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* Clip interval [x; x+w[ within [0; wmax[.
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* The resulting w may be negative if the final interval is empty.
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* dx, if not null, return the difference between in and out value of x.
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*/
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static void clip_interval(int wmax, int *x, int *w, int *dx)
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{
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if (dx)
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*dx = 0;
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if (*x < 0) {
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if (dx)
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*dx = -*x;
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*w += *x;
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*x = 0;
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}
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if (*x + *w > wmax)
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*w = wmax - *x;
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}
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/**
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* Decompose w pixels starting at x
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* into start + (w starting at x) + end
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* with x and w aligned on multiples of 1<<sub.
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*/
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static void subsampling_bounds(int sub, int *x, int *w, int *start, int *end)
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{
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int mask = (1 << sub) - 1;
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*start = (-*x) & mask;
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*x += *start;
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*start = FFMIN(*start, *w);
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*w -= *start;
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*end = *w & mask;
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*w >>= sub;
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}
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static int component_used(FFDrawContext *draw, int plane, int comp)
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{
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return (draw->comp_mask[plane] >> comp) & 1;
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}
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/* If alpha is in the [ 0 ; 0x1010101 ] range,
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then alpha * value is in the [ 0 ; 0xFFFFFFFF ] range,
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and >> 24 gives a correct rounding. */
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static void blend_line(uint8_t *dst, unsigned src, unsigned alpha,
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int dx, int w, unsigned hsub, int left, int right)
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{
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unsigned asrc = alpha * src;
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unsigned tau = 0x1010101 - alpha;
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int x;
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src *= alpha;
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if (left) {
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unsigned suba = (left * alpha) >> hsub;
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*dst = (*dst * (0x1010101 - suba) + src * suba) >> 24;
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dst += dx;
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}
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for (x = 0; x < w; x++) {
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*dst = (*dst * tau + asrc) >> 24;
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dst += dx;
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}
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if (right) {
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unsigned suba = (right * alpha) >> hsub;
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*dst = (*dst * (0x1010101 - suba) + src * suba) >> 24;
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}
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}
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void ff_blend_rectangle(FFDrawContext *draw, FFDrawColor *color,
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uint8_t *dst[], int dst_linesize[],
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int dst_w, int dst_h,
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int x0, int y0, int w, int h)
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{
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unsigned alpha, nb_planes, nb_comp, plane, comp;
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int w_sub, h_sub, x_sub, y_sub, left, right, top, bottom, y;
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uint8_t *p0, *p;
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/* TODO optimize if alpha = 0xFF */
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clip_interval(dst_w, &x0, &w, NULL);
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clip_interval(dst_h, &y0, &h, NULL);
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if (w <= 0 || h <= 0 || !color->rgba[3])
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return;
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/* 0x10203 * alpha + 2 is in the [ 2 ; 0x1010101 - 2 ] range */
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alpha = 0x10203 * color->rgba[3] + 0x2;
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nb_planes = (draw->nb_planes - 1) | 1; /* eliminate alpha */
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for (plane = 0; plane < nb_planes; plane++) {
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nb_comp = draw->pixelstep[plane];
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p0 = pointer_at(draw, dst, dst_linesize, plane, x0, y0);
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w_sub = w;
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h_sub = h;
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x_sub = x0;
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y_sub = y0;
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subsampling_bounds(draw->hsub[plane], &x_sub, &w_sub, &left, &right);
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subsampling_bounds(draw->vsub[plane], &y_sub, &h_sub, &top, &bottom);
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for (comp = 0; comp < nb_comp; comp++) {
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if (!component_used(draw, plane, comp))
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continue;
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p = p0 + comp;
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if (top) {
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blend_line(p, color->comp[plane].u8[comp], alpha >> 1,
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draw->pixelstep[plane], w_sub,
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draw->hsub[plane], left, right);
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p += dst_linesize[plane];
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}
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for (y = 0; y < h_sub; y++) {
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blend_line(p, color->comp[plane].u8[comp], alpha,
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draw->pixelstep[plane], w_sub,
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draw->hsub[plane], left, right);
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p += dst_linesize[plane];
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}
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if (bottom)
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blend_line(p, color->comp[plane].u8[comp], alpha >> 1,
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draw->pixelstep[plane], w_sub,
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draw->hsub[plane], left, right);
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}
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}
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}
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static void blend_pixel(uint8_t *dst, unsigned src, unsigned alpha,
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uint8_t *mask, int mask_linesize, int l2depth,
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unsigned w, unsigned h, unsigned shift, unsigned xm0)
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{
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unsigned xm, x, y, t = 0;
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unsigned xmshf = 3 - l2depth;
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unsigned xmmod = 7 >> l2depth;
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unsigned mbits = (1 << (1 << l2depth)) - 1;
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unsigned mmult = 255 / mbits;
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for (y = 0; y < h; y++) {
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xm = xm0;
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for (x = 0; x < w; x++) {
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t += ((mask[xm >> xmshf] >> ((~xm & xmmod) << l2depth)) & mbits)
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* mmult;
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xm++;
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}
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mask += mask_linesize;
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}
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alpha = (t >> shift) * alpha;
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*dst = ((0x1010101 - alpha) * *dst + alpha * src) >> 24;
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}
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static void blend_line_hv(uint8_t *dst, int dst_delta,
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unsigned src, unsigned alpha,
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uint8_t *mask, int mask_linesize, int l2depth, int w,
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unsigned hsub, unsigned vsub,
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int xm, int left, int right, int hband)
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{
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int x;
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if (left) {
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blend_pixel(dst, src, alpha, mask, mask_linesize, l2depth,
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left, hband, hsub + vsub, xm);
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dst += dst_delta;
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xm += left;
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}
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for (x = 0; x < w; x++) {
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blend_pixel(dst, src, alpha, mask, mask_linesize, l2depth,
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1 << hsub, hband, hsub + vsub, xm);
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dst += dst_delta;
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xm += 1 << hsub;
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}
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if (right)
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blend_pixel(dst, src, alpha, mask, mask_linesize, l2depth,
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right, hband, hsub + vsub, xm);
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}
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void ff_blend_mask(FFDrawContext *draw, FFDrawColor *color,
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uint8_t *dst[], int dst_linesize[], int dst_w, int dst_h,
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uint8_t *mask, int mask_linesize, int mask_w, int mask_h,
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int l2depth, unsigned endianness, int x0, int y0)
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{
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unsigned alpha, nb_planes, nb_comp, plane, comp;
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int xm0, ym0, w_sub, h_sub, x_sub, y_sub, left, right, top, bottom, y;
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uint8_t *p0, *p, *m;
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clip_interval(dst_w, &x0, &mask_w, &xm0);
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clip_interval(dst_h, &y0, &mask_h, &ym0);
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mask += ym0 * mask_linesize;
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if (mask_w <= 0 || mask_h <= 0 || !color->rgba[3])
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return;
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/* alpha is in the [ 0 ; 0x10203 ] range,
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alpha * mask is in the [ 0 ; 0x1010101 - 4 ] range */
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alpha = (0x10307 * color->rgba[3] + 0x3) >> 8;
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nb_planes = (draw->nb_planes - 1) | 1; /* eliminate alpha */
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for (plane = 0; plane < nb_planes; plane++) {
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nb_comp = draw->pixelstep[plane];
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p0 = pointer_at(draw, dst, dst_linesize, plane, x0, y0);
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w_sub = mask_w;
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h_sub = mask_h;
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x_sub = x0;
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y_sub = y0;
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subsampling_bounds(draw->hsub[plane], &x_sub, &w_sub, &left, &right);
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subsampling_bounds(draw->vsub[plane], &y_sub, &h_sub, &top, &bottom);
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for (comp = 0; comp < nb_comp; comp++) {
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if (!component_used(draw, plane, comp))
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continue;
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p = p0 + comp;
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m = mask;
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if (top) {
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blend_line_hv(p, draw->pixelstep[plane],
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color->comp[plane].u8[comp], alpha,
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m, mask_linesize, l2depth, w_sub,
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draw->hsub[plane], draw->vsub[plane],
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xm0, left, right, top);
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p += dst_linesize[plane];
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m += top * mask_linesize;
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}
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for (y = 0; y < h_sub; y++) {
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blend_line_hv(p, draw->pixelstep[plane],
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color->comp[plane].u8[comp], alpha,
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m, mask_linesize, l2depth, w_sub,
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draw->hsub[plane], draw->vsub[plane],
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xm0, left, right, 1 << draw->vsub[plane]);
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p += dst_linesize[plane];
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m += mask_linesize << draw->vsub[plane];
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}
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if (bottom)
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blend_line_hv(p, draw->pixelstep[plane],
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color->comp[plane].u8[comp], alpha,
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m, mask_linesize, l2depth, w_sub,
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draw->hsub[plane], draw->vsub[plane],
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xm0, left, right, bottom);
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}
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}
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}
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int ff_draw_round_to_sub(FFDrawContext *draw, int sub_dir, int round_dir,
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int value)
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{
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@ -50,6 +50,7 @@ typedef struct FFDrawContext {
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enum PixelFormat format;
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unsigned nb_planes;
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int pixelstep[MAX_PLANES]; /*< offset between pixels */
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uint8_t comp_mask[MAX_PLANES]; /*< bitmask of used non-alpha components */
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uint8_t hsub[MAX_PLANES]; /*< horizontal subsamling */
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uint8_t vsub[MAX_PLANES]; /*< vertical subsamling */
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uint8_t hsub_max;
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@ -57,6 +58,7 @@ typedef struct FFDrawContext {
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} FFDrawContext;
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typedef struct FFDrawColor {
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uint8_t rgba[4];
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union {
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uint32_t u32;
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uint16_t u16;
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@ -100,6 +102,37 @@ void ff_fill_rectangle(FFDrawContext *draw, FFDrawColor *color,
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uint8_t *dst[], int dst_linesize[],
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int dst_x, int dst_y, int w, int h);
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/**
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* Blend a rectangle with an uniform color.
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*/
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void ff_blend_rectangle(FFDrawContext *draw, FFDrawColor *color,
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uint8_t *dst[], int dst_linesize[],
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int dst_w, int dst_h,
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int x0, int y0, int w, int h);
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/**
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* Blend an alpha mask with an uniform color.
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*
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* @param draw draw context
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* @param color color for the overlay;
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* @param dst destination image
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* @param dst_linesize line stride of the destination
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* @param dst_w width of the destination image
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* @param dst_h height of the destination image
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* @param mask mask
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* @param mask_linesize line stride of the mask
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* @param mask_w width of the mask
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* @param mask_h height of the mask
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* @param l2depth log2 of depth of the mask (0 for 1bpp, 3 for 8bpp)
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* @param endianness bit order of the mask (0: MSB to the left)
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* @param x0 horizontal position of the overlay
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* @param y0 vertical position of the overlay
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*/
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void ff_blend_mask(FFDrawContext *draw, FFDrawColor *color,
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uint8_t *dst[], int dst_linesize[], int dst_w, int dst_h,
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uint8_t *mask, int mask_linesize, int mask_w, int mask_h,
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int l2depth, unsigned endianness, int x0, int y0);
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/**
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* Round a dimension according to subsampling.
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*
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