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Performance: Limit blitting work to overlapping area

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Lars Mueller 2024-01-27 22:59:27 +01:00 committed by Lars Müller
parent ffec698d3e
commit 40bf88ac74
1 changed files with 15 additions and 64 deletions
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79
src/client/tile.cpp
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@ -539,14 +539,11 @@ u32 TextureSource::getTextureId(const std::string &name)
// Draw an image on top of another one, using the alpha channel of the
// source image
// overlay: only modify destination pixels that are fully opaque.
template<bool overlay = false>
static void blit_with_alpha(video::IImage *src, video::IImage *dst,
v2s32 src_pos, v2s32 dst_pos, v2u32 size);
// Like blit_with_alpha, but only modifies destination pixels that
// are fully opaque
static void blit_with_alpha_overlay(video::IImage *src, video::IImage *dst,
v2s32 src_pos, v2s32 dst_pos, v2u32 size);
// Apply a color to an image. Uses an int (0-255) to calculate the ratio.
// If the ratio is 255 or -1 and keep_alpha is true, then it multiples the
// color alpha with the destination alpha.
@ -2042,35 +2039,21 @@ static inline video::SColor blitPixel(const video::SColor src_c, const video::SC
This exists because IImage::copyToWithAlpha() doesn't seem to always
work.
*/
template<bool overlay>
static void blit_with_alpha(video::IImage *src, video::IImage *dst,
v2s32 src_pos, v2s32 dst_pos, v2u32 size)
{
// FIXME: loop should be restricted to actual overlap
// (if dst smaller than size or dst_pos negative)
for (u32 y0=0; y0<size.Y; y0++)
for (u32 x0=0; x0<size.X; x0++)
{
s32 src_x = src_pos.X + x0;
s32 src_y = src_pos.Y + y0;
s32 dst_x = dst_pos.X + x0;
s32 dst_y = dst_pos.Y + y0;
video::SColor src_c = src->getPixel(src_x, src_y);
video::SColor dst_c = dst->getPixel(dst_x, dst_y);
dst_c = blitPixel(src_c, dst_c, src_c.getAlpha());
dst->setPixel(dst_x, dst_y, dst_c);
}
}
auto src_dim = src->getDimension();
auto dst_dim = dst->getDimension();
/*
Draw an image on top of another one, using the alpha channel of the
source image; only modify fully opaque pixels in destinaion
*/
static void blit_with_alpha_overlay(video::IImage *src, video::IImage *dst,
v2s32 src_pos, v2s32 dst_pos, v2u32 size)
{
// FIXME: same as above here
for (u32 y0=0; y0<size.Y; y0++)
for (u32 x0=0; x0<size.X; x0++)
// Limit y and x to the overlapping ranges
// s.t. the positions are all in bounds after offsetting.
for (u32 y0 = std::max(0, -dst_pos.Y);
y0 < std::min<s64>({size.Y, src_dim.Height, dst_dim.Height - (s64) dst_pos.Y});
++y0)
for (u32 x0 = std::max(0, -dst_pos.X);
x0 < std::min<s64>({size.X, src_dim.Width, dst_dim.Width - (s64) dst_pos.X});
++x0)
{
s32 src_x = src_pos.X + x0;
s32 src_y = src_pos.Y + y0;
@ -2078,45 +2061,13 @@ static void blit_with_alpha_overlay(video::IImage *src, video::IImage *dst,
s32 dst_y = dst_pos.Y + y0;
video::SColor src_c = src->getPixel(src_x, src_y);
video::SColor dst_c = dst->getPixel(dst_x, dst_y);
if (dst_c.getAlpha() == 255 && src_c.getAlpha() != 0)
{
if (!overlay || (dst_c.getAlpha() == 255 && src_c.getAlpha() != 0)) {
dst_c = blitPixel(src_c, dst_c, src_c.getAlpha());
dst->setPixel(dst_x, dst_y, dst_c);
}
}
}
// This function has been disabled because it is currently unused.
// Feel free to re-enable if you find it handy.
#if 0
/*
Draw an image on top of another one, using the specified ratio
modify all partially-opaque pixels in the destination.
*/
static void blit_with_interpolate_overlay(video::IImage *src, video::IImage *dst,
v2s32 src_pos, v2s32 dst_pos, v2u32 size, int ratio)
{
for (u32 y0 = 0; y0 < size.Y; y0++)
for (u32 x0 = 0; x0 < size.X; x0++)
{
s32 src_x = src_pos.X + x0;
s32 src_y = src_pos.Y + y0;
s32 dst_x = dst_pos.X + x0;
s32 dst_y = dst_pos.Y + y0;
video::SColor src_c = src->getPixel(src_x, src_y);
video::SColor dst_c = dst->getPixel(dst_x, dst_y);
if (dst_c.getAlpha() > 0 && src_c.getAlpha() != 0)
{
if (ratio == -1)
dst_c = src_c.getInterpolated(dst_c, (float)src_c.getAlpha()/255.0f);
else
dst_c = src_c.getInterpolated(dst_c, (float)ratio/255.0f);
dst->setPixel(dst_x, dst_y, dst_c);
}
}
}
#endif
/*
Apply color to destination, using a weighted interpolation blend
*/
@ -2455,7 +2406,7 @@ static void draw_crack(video::IImage *crack, video::IImage *dst,
if (!crack_scaled)
return;
auto blit = use_overlay ? blit_with_alpha_overlay : blit_with_alpha;
auto blit = use_overlay ? blit_with_alpha<true> : blit_with_alpha<false>;
for (s32 i = 0; i < frame_count; ++i) {
v2s32 dst_pos(0, frame_size.Height * i);
blit(crack_scaled, dst, v2s32(0,0), dst_pos, frame_size);