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