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avfilter/vf_blend: fix normal mode with opacity != 1

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Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol 2015-10-09 12:12:03 +02:00
parent f00ec7eb1b
commit 5e0abf59d8
1 changed files with 46 additions and 1 deletions
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47
libavfilter/vf_blend.c
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@ -126,6 +126,50 @@ static void blend_normal(const uint8_t *top, ptrdiff_t top_linesize,
av_image_copy_plane(dst, dst_linesize, top, top_linesize, width, end - start);
}
static void blend_normal_8bit(const uint8_t *top, ptrdiff_t top_linesize,
const uint8_t *bottom, ptrdiff_t bottom_linesize,
uint8_t *dst, ptrdiff_t dst_linesize,
ptrdiff_t width, ptrdiff_t start, ptrdiff_t end,
FilterParams *param, double *values)
{
const double opacity = param->opacity;
int i, j;
for (i = start; i < end; i++) {
for (j = 0; j < width; j++) {
dst[j] = top[j] * opacity + bottom[j] * (1. - opacity);
}
dst += dst_linesize;
top += top_linesize;
bottom += bottom_linesize;
}
}
static void blend_normal_16bit(const uint8_t *_top, ptrdiff_t top_linesize,
const uint8_t *_bottom, ptrdiff_t bottom_linesize,
uint8_t *_dst, ptrdiff_t dst_linesize,
ptrdiff_t width, ptrdiff_t start, ptrdiff_t end,
FilterParams *param, double *values)
{
const uint16_t *top = (uint16_t*)_top;
const uint16_t *bottom = (uint16_t*)_bottom;
uint16_t *dst = (uint16_t*)_dst;
const double opacity = param->opacity;
int i, j;
dst_linesize /= 2;
top_linesize /= 2;
bottom_linesize /= 2;
for (i = start; i < end; i++) {
for (j = 0; j < width; j++) {
dst[j] = top[j] * opacity + bottom[j] * (1. - opacity);
}
dst += dst_linesize;
top += top_linesize;
bottom += bottom_linesize;
}
}
#define DEFINE_BLEND8(name, expr) \
static void blend_## name##_8bit(const uint8_t *top, ptrdiff_t top_linesize, \
const uint8_t *bottom, ptrdiff_t bottom_linesize, \
@ -457,7 +501,8 @@ static int config_output(AVFilterLink *outlink)
case BLEND_LINEARLIGHT:param->blend = is_16bit ? blend_linearlight_16bit: blend_linearlight_8bit;break;
case BLEND_MULTIPLY: param->blend = is_16bit ? blend_multiply_16bit : blend_multiply_8bit; break;
case BLEND_NEGATION: param->blend = is_16bit ? blend_negation_16bit : blend_negation_8bit; break;
case BLEND_NORMAL: param->blend = blend_normal; break;
case BLEND_NORMAL: param->blend = param->opacity == 1 ? blend_normal:
is_16bit ? blend_normal_16bit : blend_normal_8bit; break;
case BLEND_OR: param->blend = is_16bit ? blend_or_16bit : blend_or_8bit; break;
case BLEND_OVERLAY: param->blend = is_16bit ? blend_overlay_16bit : blend_overlay_8bit; break;
case BLEND_PHOENIX: param->blend = is_16bit ? blend_phoenix_16bit : blend_phoenix_8bit; break;