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VSE: Speed up "Alpha Over" if the pixels are fully transparent or opaque #117134

Merged
Sebastian Parborg merged 1 commits from ZedDB/blender:vse_alpha_over into main 2024-01-15 18:13:00 +01:00
Conversation 0 Commits 1 Files Changed 1 +42 -32
1 changed files with 42 additions and 32 deletions
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74
source/blender/sequencer/intern/effects.cc
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@ -243,6 +243,16 @@ static void init_alpha_over_or_under(Sequence *seq)
seq->seq1 = seq2;
}
static bool alpha_opaque(uchar alpha)
{
return alpha == 255;
}
static bool alpha_opaque(float alpha)
{
return alpha >= 1.0f;
}
/* dst = src1 over src2 (alpha from src1) */
template<typename T>
static void do_alphaover_effect(
@ -253,23 +263,25 @@ static void do_alphaover_effect(
return;
}
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++) {
for (int pixel_idx = 0; pixel_idx < width * height; pixel_idx++) {
if (src1[3] <= 0.0f) {
/* Alpha of zero. No color addition will happen as the colors are premultipled. */
memcpy(dst, src2, sizeof(T) * 4);
}
else if (fac == 1.0f && alpha_opaque(src1[3])) {
/* No change to src1 as fac == 1 and fully opaque. */
memcpy(dst, src1, sizeof(T) * 4);
}
else {
float4 col1 = load_premul_pixel(src1);
float mfac = 1.0f - fac * col1.w;
if (mfac <= 0.0f) {
memcpy(dst, src1, sizeof(T) * 4);
}
else {
float4 col2 = load_premul_pixel(src2);
float4 col = fac * col1 + mfac * col2;
store_premul_pixel(col, dst);
}
src1 += 4;
src2 += 4;
dst += 4;
float4 col2 = load_premul_pixel(src2);
float4 col = fac * col1 + mfac * col2;
store_premul_pixel(col, dst);
}
src1 += 4;
src2 += 4;
dst += 4;
}
}
@ -318,25 +330,23 @@ static void do_alphaunder_effect(
return;
}
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++) {
float4 col2 = load_premul_pixel(src2);
if (col2.w <= 0.0f) {
memcpy(dst, src1, sizeof(T) * 4);
}
else if (col2.w >= 1.0f || fac <= 0.0f) {
memcpy(dst, src2, sizeof(T) * 4);
}
else {
float mfac = fac * (1.0f - col2.w);
float4 col1 = load_premul_pixel(src1);
float4 col = mfac * col1 + col2;
store_premul_pixel(col, dst);
}
src1 += 4;
src2 += 4;
dst += 4;
for (int pixel_idx = 0; pixel_idx < width * height; pixel_idx++) {
if (src2[3] <= 0.0f) {
memcpy(dst, src1, sizeof(T) * 4);
}
else if (alpha_opaque(src2[3]) || fac <= 0.0f) {
memcpy(dst, src2, sizeof(T) * 4);
}
else {
float4 col2 = load_premul_pixel(src2);
float mfac = fac * (1.0f - col2.w);
float4 col1 = load_premul_pixel(src1);
float4 col = mfac * col1 + col2;
store_premul_pixel(col, dst);
}
src1 += 4;
src2 += 4;
dst += 4;
}
}