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sw_engine raster: code refactoring

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changed internal function names, keep the neat & clean thorvg style code.
This commit is contained in:
Hermet Park 2021-11-17 19:38:35 +09:00
parent e0c3fafb18
commit 92f57a149f
1 changed files with 30 additions and 26 deletions
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56
src/lib/sw_engine/tvgSwRaster.cpp
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@ -70,13 +70,14 @@ static bool _translucent(const SwSurface* surface, uint8_t a)
}
static uint32_t _applyBilinearInterpolation(const uint32_t *img, uint32_t w, uint32_t h, float fX, float fY)
//Bilinear Interpolation
static uint32_t _interpUpScaler(const uint32_t *img, uint32_t w, uint32_t h, float fX, float fY)
{
auto rX = static_cast<uint32_t>(fX);
auto rY = static_cast<uint32_t>(fY);
auto dX = static_cast<uint32_t>((fX - rX) * 255.0);
auto dY = static_cast<uint32_t>((fY - rY) * 255.0);
auto dX = static_cast<uint32_t>((fX - rX) * 255.0f);
auto dY = static_cast<uint32_t>((fY - rY) * 255.0f);
auto c1 = img[rX + (rY * w)];
auto c2 = img[(rX + 1) + (rY * w)];
@ -84,24 +85,26 @@ static uint32_t _applyBilinearInterpolation(const uint32_t *img, uint32_t w, uin
auto c4 = img[rX + ((rY + 1) * w)];
if (c1 == c2 && c1 == c3 && c1 == c4) return img[rX + (rY * w)];
return COLOR_INTERPOLATE(COLOR_INTERPOLATE(c1, 255 - dX, c2, dX), 255 - dY, COLOR_INTERPOLATE(c4, 255 - dX, c3, dX), dY);
}
static uint32_t _average2Nx2NPixel(SwSurface* surface, const uint32_t *img, uint32_t w, uint32_t h, uint32_t rX, uint32_t rY, uint32_t n)
//2n x 2n Mean Kernel
static uint32_t _interpDownScaler(const uint32_t *img, uint32_t w, uint32_t h, uint32_t rX, uint32_t rY, uint32_t n)
{
uint32_t c[4] = { 0 };
auto n2 = n * n;
auto source = img + rX - n + (rY - n) * w;
auto src = img + rX - n + (rY - n) * w;
for (auto y = rY - n; y < rY + n; ++y) {
auto src = source;
for (auto x = rX - n; x < rX + n; ++x, ++src) {
c[0] += *src >> 24;
c[1] += (*src >> 16) & 0xff;
c[2] += (*src >> 8) & 0xff;
c[3] += *src & 0xff;
auto p = src;
for (auto x = rX - n; x < rX + n; ++x, ++p) {
c[0] += *p >> 24;
c[1] += (*p >> 16) & 0xff;
c[2] += (*p >> 8) & 0xff;
c[3] += *p & 0xff;
}
source += w;
src += w;
}
for (auto i = 0; i < 4; ++i) {
c[i] = (c[i] >> 2) / n2;
@ -109,6 +112,7 @@ static uint32_t _average2Nx2NPixel(SwSurface* surface, const uint32_t *img, uint
return (c[0] << 24) | (c[1] << 16) | (c[2] << 8) | c[3];
}
/************************************************************************/
/* Rect */
/************************************************************************/
@ -333,7 +337,7 @@ static bool _rasterDownScaledMaskedRleImage(SwSurface* surface, const SwImage* i
if (rX >= w || rY >= h) continue;
uint32_t src;
if (rX < halfScale || rY < halfScale || rX >= w - halfScale || rY >= h - halfScale) src = ALPHA_BLEND(img[rY * image->stride + rX], alpha);
else src = ALPHA_BLEND(_average2Nx2NPixel(surface, img, image->stride, h, rX, rY, halfScale), alpha);
else src = ALPHA_BLEND(_interpDownScaler(img, image->stride, h, rX, rY, halfScale), alpha);
auto tmp = ALPHA_BLEND(src, blendMethod(*cmp));
*dst = tmp + ALPHA_BLEND(*dst, surface->blender.ialpha(tmp));
}
@ -344,7 +348,7 @@ static bool _rasterDownScaledMaskedRleImage(SwSurface* surface, const SwImage* i
if (rX >= w || rY >= h) continue;
uint32_t src;
if (rX < halfScale || rY < halfScale || rX >= w - halfScale || rY >= h - halfScale) src = ALPHA_BLEND(img[rY * image->stride + rX], alpha);
else src = ALPHA_BLEND(_average2Nx2NPixel(surface, img, image->stride, h, rX, rY, halfScale), alpha);
else src = ALPHA_BLEND(_interpDownScaler(img, image->stride, h, rX, rY, halfScale), alpha);
auto tmp = ALPHA_BLEND(src, _multiplyAlpha(alpha, blendMethod(*cmp)));
*dst = tmp + ALPHA_BLEND(*dst, surface->blender.ialpha(tmp));
}
@ -372,7 +376,7 @@ static bool _rasterDownScaledTranslucentRleImage(SwSurface* surface, const SwIma
if (rX >= w || rY >= h) continue;
uint32_t src;
if (rX < halfScale || rY < halfScale || rX >= w - halfScale || rY >= h - halfScale) src = ALPHA_BLEND(img[rY * image->stride + rX], alpha);
else src = ALPHA_BLEND(_average2Nx2NPixel(surface, img, image->stride, h, rX, rY, halfScale), alpha);
else src = ALPHA_BLEND(_interpDownScaler(img, image->stride, h, rX, rY, halfScale), alpha);
*dst = src + ALPHA_BLEND(*dst, surface->blender.ialpha(src));
}
}
@ -405,7 +409,7 @@ static bool _rasterUpScaledMaskedRleImage(SwSurface* surface, const SwImage* ima
if (rX >= w || rY >= h) continue;
uint32_t src;
if (rX == w - 1 || rY == h - 1) src = ALPHA_BLEND(img[rY * image->stride + rX], alpha);
else src = ALPHA_BLEND(_applyBilinearInterpolation(img, image->stride, h, fX, fY), alpha);
else src = ALPHA_BLEND(_interpUpScaler(img, image->stride, h, fX, fY), alpha);
auto tmp = ALPHA_BLEND(src, blendMethod(*cmp));
*dst = tmp + ALPHA_BLEND(*dst, surface->blender.ialpha(tmp));
}
@ -418,7 +422,7 @@ static bool _rasterUpScaledMaskedRleImage(SwSurface* surface, const SwImage* ima
if (rX >= w || rY >= h) continue;
uint32_t src;
if (rX == w - 1 || rY == h - 1) src = ALPHA_BLEND(img[rY * image->stride + rX], alpha);
else src = ALPHA_BLEND(_applyBilinearInterpolation(img, image->stride, h, fX, fY), alpha);
else src = ALPHA_BLEND(_interpUpScaler(img, image->stride, h, fX, fY), alpha);
auto tmp = ALPHA_BLEND(src, _multiplyAlpha(alpha, blendMethod(*cmp)));
*dst = tmp + ALPHA_BLEND(*dst, surface->blender.ialpha(tmp));
}
@ -448,7 +452,7 @@ static bool _rasterUpScaledTranslucentRleImage(SwSurface* surface, const SwImage
if (rX >= w || rY >= h) continue;
uint32_t src;
if (rX == w - 1 || rY == h - 1) src = ALPHA_BLEND(img[rY * image->stride + rX], alpha);
else src = ALPHA_BLEND(_applyBilinearInterpolation(img, image->stride, h, fX, fY), alpha);
else src = ALPHA_BLEND(_interpUpScaler(img, image->stride, h, fX, fY), alpha);
*dst = src + ALPHA_BLEND(*dst, surface->blender.ialpha(src));
}
}
@ -538,7 +542,7 @@ static bool _rasterDownScaledSolidRleImage(SwSurface* surface, const SwImage* im
uint32_t src;
if (rX < halfScale || rY < halfScale || rX >= w - halfScale || rY >= h - halfScale) src = ALPHA_BLEND(img[rY * image->stride + rX], span->coverage);
else src = ALPHA_BLEND(_average2Nx2NPixel(surface, img, image->stride, h, rX, rY, halfScale), span->coverage);
else src = ALPHA_BLEND(_interpDownScaler(img, image->stride, h, rX, rY, halfScale), span->coverage);
*dst = src + ALPHA_BLEND(*dst, surface->blender.ialpha(src));
}
}
@ -565,7 +569,7 @@ static bool _rasterUpScaledSolidRleImage(SwSurface* surface, const SwImage* imag
if (rX >= w || rY >= h) continue;
uint32_t src;
if (rX == w - 1 || rY == h - 1) src = ALPHA_BLEND(img[rY * image->stride + rX], span->coverage);
else src = ALPHA_BLEND(_applyBilinearInterpolation(img, image->stride, h, fX, fY), span->coverage);
else src = ALPHA_BLEND(_interpUpScaler(img, image->stride, h, fX, fY), span->coverage);
*dst = src + ALPHA_BLEND(*dst, surface->blender.ialpha(src));
}
}
@ -746,7 +750,7 @@ static bool _rasterDownScaledMaskedImage(SwSurface* surface, const SwImage* imag
if (rX < halfScale || rY < halfScale || rX >= w - halfScale || rY >= h - halfScale) {
src = ALPHA_BLEND(img[rX + (rY * image->stride)], _multiplyAlpha(opacity, blendMethod(*cmp)));
} else {
src = ALPHA_BLEND(_average2Nx2NPixel(surface, img, image->stride, h, rX, rY, halfScale), _multiplyAlpha(opacity, blendMethod(*cmp)));
src = ALPHA_BLEND(_interpDownScaler(img, image->stride, h, rX, rY, halfScale), _multiplyAlpha(opacity, blendMethod(*cmp)));
}
*dst = src + ALPHA_BLEND(*dst, surface->blender.ialpha(src));
}
@ -774,7 +778,7 @@ static bool _rasterDownScaledTranslucentImage(SwSurface* surface, const SwImage*
if (rX >= w || rY >= h) continue;
uint32_t src;
if (rX < halfScale || rY < halfScale || rX >= w - halfScale || rY >= h - halfScale) src = ALPHA_BLEND(img[rX + (rY * w)], opacity);
else src = ALPHA_BLEND(_average2Nx2NPixel(surface, img, w, h, rX, rY, halfScale), opacity);
else src = ALPHA_BLEND(_interpDownScaler(img, w, h, rX, rY, halfScale), opacity);
*dst = src + ALPHA_BLEND(*dst, surface->blender.ialpha(src));
}
dbuffer += surface->stride;
@ -806,7 +810,7 @@ static bool _rasterUpScaledMaskedImage(SwSurface* surface, const SwImage* image,
if (rX >= w || rY >= h) continue;
uint32_t src;
if (rX == w - 1 || rY == h - 1) src = ALPHA_BLEND(img[rX + (rY * image->stride)], _multiplyAlpha(opacity, blendMethod(*cmp)));
else src = ALPHA_BLEND(_applyBilinearInterpolation(img, image->stride, h, fX, fY), _multiplyAlpha(opacity, blendMethod(*cmp)));
else src = ALPHA_BLEND(_interpUpScaler(img, image->stride, h, fX, fY), _multiplyAlpha(opacity, blendMethod(*cmp)));
*dst = src + ALPHA_BLEND(*dst, surface->blender.ialpha(src));
}
dbuffer += surface->stride;
@ -835,7 +839,7 @@ static bool _rasterUpScaledTranslucentImage(SwSurface* surface, const SwImage* i
if (rX >= w || rY >= h) continue;
uint32_t src;
if (rX == w - 1 || rY == h - 1) src = ALPHA_BLEND(img[rX + (rY * image->stride)], opacity);
else src = ALPHA_BLEND(_applyBilinearInterpolation(img, image->stride, h, fX, fY), opacity);
else src = ALPHA_BLEND(_interpUpScaler(img, image->stride, h, fX, fY), opacity);
*dst = src + ALPHA_BLEND(*dst, surface->blender.ialpha(src));
}
dbuffer += surface->stride;
@ -923,7 +927,7 @@ static bool _rasterDownScaledSolidImage(SwSurface* surface, const SwImage* image
if (rX >= w || rY >= h) continue;
uint32_t src;
if (rX < halfScale || rY < halfScale || rX >= w - halfScale || rY >= h - halfScale) src = img[rX + (rY * w)];
else src = _average2Nx2NPixel(surface, img, w, h, rX, rY, halfScale);
else src = _interpDownScaler(img, w, h, rX, rY, halfScale);
*dst = src + ALPHA_BLEND(*dst, surface->blender.ialpha(src));
}
}
@ -949,7 +953,7 @@ static bool _rasterUpScaledSolidImage(SwSurface* surface, const SwImage* image,
if (rX >= w || rY >= h) continue;
uint32_t src;
if (rX == w - 1 || rY == h - 1) src = img[rX + (rY * w)];
else src = _applyBilinearInterpolation(img, w, h, fX, fY);
else src = _interpUpScaler(img, w, h, fX, fY);
*dst = src + ALPHA_BLEND(*dst, surface->blender.ialpha(src));
}
}