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GBlend.cpp
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GBlend.cpp
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#include "GBlend.h"
#include "include/GPixel.h"
#include "include/GPaint.h"
#include "include/GColor.h"
#include "include/GShader.h"
#include "include/GBlendMode.h"
// enum class GMode{
// mNormal,
// mZero,
// mHalf,
// mOne
// };
// typedef GPixel (*GBlendFunc)(const GPixel&, const GPixel&);
GPixel GColorToPixel(const GColor& color){
float fAPinned = GPinToUnit(color.fA);
return GPixel_PackARGB(GRoundToInt(fAPinned * 255.0),
GRoundToInt(GPinToUnit(color.fR) * fAPinned * 255.0),
GRoundToInt(GPinToUnit(color.fG) * fAPinned * 255.0),
GRoundToInt(GPinToUnit(color.fB) * fAPinned * 255.0));
}
uint64_t const GExpand(uint32_t op){
uint64_t hi = op & 0xFF00FF00;
uint64_t lo = op & 0x00FF00FF;
return (hi << 24) | lo;
}
uint32_t GDiv255(uint64_t op){
op >>= 8;
return ((op >> 24) & 0xFF00FF00) | (op & 0xFF00FF);
}
uint64_t GMultXor(GPixel c1, GPixel x1, GPixel c2, GPixel x2){
uint64_t result = GExpand(x1) * c1 + GExpand(x2) * c2;
result += 0x80008000800080;
result += (result >> 8) & 0xFF00FF00FF00FF;
return result;
}
uint32_t GDiv(uint32_t op){
op += 128;
return op + (op >> 8) >> 8;
}
GPixel GMultPixel(const GPixel& p1, const GPixel& p2){
int a1 = GPixel_GetA(p1), r1 = GPixel_GetR(p1), g1 = GPixel_GetG(p1), b1 = GPixel_GetB(p1);
int a2 = GPixel_GetA(p2), r2 = GPixel_GetR(p2), g2 = GPixel_GetG(p2), b2 = GPixel_GetB(p2);
return GPixel_PackARGB(GDiv(a1* a2), GDiv(r1* r2), GDiv(g1* g2), GDiv(b1* b2));
}
uint64_t GMult(uint32_t op1, uint8_t op2){
uint64_t result = GExpand(op1) * op2;
result += 0x80008000800080;
result += (result >> 8) & 0xFF00FF00FF00FF;
return result;
}
GPixel div2_127(const GPixel& pixel){
return GPixel_PackARGB((GPixel_GetA(pixel)) >> 1,
(GPixel_GetR(pixel)) >> 1,
(GPixel_GetG(pixel)) >> 1,
(GPixel_GetB(pixel)) >> 1);
}
GPixel div2_128(const GPixel& pixel){
return GPixel_PackARGB((GPixel_GetA(pixel) + 1) >> 1,
(GPixel_GetR(pixel) + 1) >> 1,
(GPixel_GetG(pixel) + 1) >> 1,
(GPixel_GetB(pixel) + 1) >> 1);
}
GPixel blend_clear(const GPixel& src, const GPixel& des){
return 0;
}
GPixel blend_src(const GPixel& src, const GPixel& des){
return src;
}
GPixel blend_dst(const GPixel& src, const GPixel& des){
return des;
}
GPixel blend_srcover(const GPixel& src, const GPixel& des){
return src + GDiv255(GMult(des, 255 - GPixel_GetA(src)));
}
GPixel blend_dstover(const GPixel& src, const GPixel& des){
return des + GDiv255(GMult(src, 255 - GPixel_GetA(des)));
}
GPixel blend_srcin(const GPixel& src, const GPixel& des){
return GDiv255(GMult(src, GPixel_GetA(des)));
}
GPixel blend_dstin(const GPixel& src, const GPixel& des){
return GDiv255(GMult(des, GPixel_GetA(src)));
}
GPixel blend_srcout(const GPixel& src, const GPixel& des){
return GDiv255(GMult(src, 255 - GPixel_GetA(des)));
}
GPixel blend_dstout(const GPixel& src, const GPixel& des){
return GDiv255(GMult(des, 255 - GPixel_GetA(src)));
}
GPixel blend_srcatop(const GPixel& src, const GPixel& des){
return GDiv255(GMult(src, GPixel_GetA(des))) + GDiv255(GMult(des, 255 - GPixel_GetA(src)));
}
GPixel blend_dstatop(const GPixel& src, const GPixel& des){
return GDiv255(GMult(des, GPixel_GetA(src))) + GDiv255(GMult(src, 255 - GPixel_GetA(des)));
}
GPixel blend_xor(const GPixel& src, const GPixel& des){
return GDiv255(GMultXor(255 - GPixel_GetA(src), des, 255 - GPixel_GetA(des), src));
}
void GBlend(const GPaint& paint, GPixel* row, int count){
GBlendMode mode = paint.getBlendMode();
GColor color = paint.getColor();
GPixel src = GColorToPixel(color);
float fA = color.fA;
if(fA == 0.0){
switch(mode){
case GBlendMode::kClear:
std::fill(row, row + count, 0);
break;
case GBlendMode::kSrc:
std::fill(row, row + count, 0);
break;
case GBlendMode::kDst:
break;
case GBlendMode::kSrcOver:
break;
case GBlendMode::kDstOver:
break;
case GBlendMode::kSrcIn:
std::fill(row, row + count, 0);
break;
case GBlendMode::kDstIn:
std::fill(row, row + count, 0);
break;
case GBlendMode::kSrcOut:
std::fill(row, row + count, 0);
break;
case GBlendMode::kDstOut:
break;
case GBlendMode::kSrcATop:
break;
case GBlendMode::kDstATop:
std::fill(row, row + count, 0);
break;
case GBlendMode::kXor:{
break;
}
}
}
else if(fA == 1.0){
switch(mode){
case GBlendMode::kClear:
std::fill(row, row + count, 0);
break;
case GBlendMode::kSrc:
std::fill(row, row + count, src);
break;
case GBlendMode::kDst:
break;
case GBlendMode::kSrcOver:
std::fill(row, row + count, src);
break;
case GBlendMode::kDstOver:
for(int i = 0; i < count; ++i)
row[i] = blend_dstover(src, row[i]);
break;
case GBlendMode::kSrcIn:
for(int i = 0; i < count; ++i)
row[i] = blend_srcin(src, row[i]);
break;
case GBlendMode::kDstIn:
break;
case GBlendMode::kSrcOut:
for(int i = 0; i < count; ++i)
row[i] = blend_srcout(src, row[i]);
break;
case GBlendMode::kDstOut:
std::fill(row, row + count, 0);
break;
case GBlendMode::kSrcATop:
for(int i = 0; i < count; ++i)
row[i] = blend_srcin(src, row[i]);
break;
case GBlendMode::kDstATop:
for(int i = 0; i < count; ++i)
row[i] = blend_srcout(src, row[i]) + row[i];
break;
case GBlendMode::kXor:{
for(int i = 0; i < count; ++i)
row[i] = blend_srcout(src, row[i]);
break;
}
}
}
else if(fA == 0.5){
switch(mode){
case GBlendMode::kClear:
std::fill(row, row + count, 0);
break;
case GBlendMode::kSrc:
std::fill(row, row + count, src);
break;
case GBlendMode::kDst:
break;
case GBlendMode::kSrcOver:
for(int i = 0; i < count; ++i)
row[i] = src + div2_127(row[i]);
break;
case GBlendMode::kDstOver:
for(int i = 0; i < count; ++i)
row[i] = blend_dstover(src, row[i]);
break;
case GBlendMode::kSrcIn:
for(int i = 0; i < count; ++i)
row[i] = blend_srcin(src, row[i]);
break;
case GBlendMode::kDstIn:
for(int i = 0; i < count; ++i)
row[i] = div2_128(row[i]);
break;
case GBlendMode::kSrcOut:
for(int i = 0; i < count; ++i)
row[i] = blend_srcout(src, row[i]);
break;
case GBlendMode::kDstOut:
for(int i = 0; i < count; ++i)
row[i] = div2_127(row[i]);
break;
case GBlendMode::kSrcATop:
for(int i = 0; i < count; ++i)
row[i] = blend_srcin(src, row[i]) + div2_127(row[i]);
break;
case GBlendMode::kDstATop:
for(int i = 0; i < count; ++i)
row[i] = blend_srcout(src, row[i]) + div2_128(row[i]);
break;
case GBlendMode::kXor:{
for(int i = 0; i < count; ++i)
row[i] = blend_xor(src, row[i]);
break;
}
}
}
else{
switch(mode){
case GBlendMode::kClear:
std::fill(row, row + count, 0);
break;
case GBlendMode::kSrc:
std::fill(row, row + count, src);
break;
case GBlendMode::kDst:
break;
case GBlendMode::kSrcOver:
for(int i = 0; i < count; ++i)
row[i] = blend_srcover(src, row[i]);
break;
case GBlendMode::kDstOver:
for(int i = 0; i < count; ++i)
row[i] = blend_dstover(src, row[i]);
break;
case GBlendMode::kSrcIn:
for(int i = 0; i < count; ++i)
row[i] = blend_srcin(src, row[i]);
break;
case GBlendMode::kDstIn:
for(int i = 0; i < count; ++i)
row[i] = blend_dstin(src, row[i]);
break;
case GBlendMode::kSrcOut:
for(int i = 0; i < count; ++i)
row[i] = blend_srcout(src, row[i]);
break;
case GBlendMode::kDstOut:
for(int i = 0; i < count; ++i)
row[i] = blend_dstout(src, row[i]);
break;
case GBlendMode::kSrcATop:
for(int i = 0; i < count; ++i)
row[i] = blend_srcatop(src, row[i]);
break;
case GBlendMode::kDstATop:
for(int i = 0; i < count; ++i)
row[i] = blend_dstatop(src, row[i]);
break;
case GBlendMode::kXor:{
for(int i = 0; i < count; ++i)
row[i] = blend_xor(src, row[i]);
break;
}
}
}
}
void GShade(const GPaint& paint, GPixel* row, int x, int y, int count){
if(paint.getShader() == nullptr){
GBlend(paint, row, count);
}
else{
GShader* shader = paint.getShader();
GPixel src[count];
shader->shadeRow(x, y, count, src);
GBlendMode mode = paint.getBlendMode();
if(shader -> isOpaque()){
switch(mode){
case GBlendMode::kClear:
std::fill(row, row + count, 0);
break;
case GBlendMode::kSrc:
for(int i = 0; i < count; ++i)
row[i] = src[i];
break;
case GBlendMode::kDst:
break;
case GBlendMode::kSrcOver:
for(int i = 0; i < count; ++i)
row[i] = src[i];
break;
case GBlendMode::kDstOver:
for(int i = 0; i < count; ++i)
row[i] = blend_dstover(src[i], row[i]);
break;
case GBlendMode::kSrcIn:
for(int i = 0; i < count; ++i)
row[i] = blend_srcin(src[i], row[i]);
break;
case GBlendMode::kDstIn:
break;
case GBlendMode::kSrcOut:
for(int i = 0; i < count; ++i)
row[i] = blend_srcout(src[i], row[i]);
break;
case GBlendMode::kDstOut:
std::fill(row, row + count, 0);
break;
case GBlendMode::kSrcATop:
for(int i = 0; i < count; ++i)
row[i] = blend_srcin(src[i], row[i]);
break;
case GBlendMode::kDstATop:
for(int i = 0; i < count; ++i)
row[i] = row[i] + blend_srcout(src[i], row[i]);
break;
case GBlendMode::kXor:{
for(int i = 0; i < count; ++i)
row[i] = blend_srcout(src[i], row[i]);
break;
}
}
}
else{
switch(mode){
case GBlendMode::kClear:
std::fill(row, row + count, 0);
break;
case GBlendMode::kSrc:
for(int i = 0; i < count; ++i)
row[i] = blend_src(src[i], row[i]);
break;
case GBlendMode::kDst:
break;
case GBlendMode::kSrcOver:
for(int i = 0; i < count; ++i)
row[i] = blend_srcover(src[i], row[i]);
break;
case GBlendMode::kDstOver:
for(int i = 0; i < count; ++i)
row[i] = blend_dstover(src[i], row[i]);
break;
case GBlendMode::kSrcIn:
for(int i = 0; i < count; ++i)
row[i] = blend_srcin(src[i], row[i]);
break;
case GBlendMode::kDstIn:
for(int i = 0; i < count; ++i)
row[i] = blend_dstin(src[i], row[i]);
break;
case GBlendMode::kSrcOut:
for(int i = 0; i < count; ++i)
row[i] = blend_srcout(src[i], row[i]);
break;
case GBlendMode::kDstOut:
for(int i = 0; i < count; ++i)
row[i] = blend_dstout(src[i], row[i]);
break;
case GBlendMode::kSrcATop:
for(int i = 0; i < count; ++i)
row[i] = blend_srcatop(src[i], row[i]);
break;
case GBlendMode::kDstATop:
for(int i = 0; i < count; ++i)
row[i] = blend_dstatop(src[i], row[i]);
break;
case GBlendMode::kXor:{
for(int i = 0; i < count; ++i)
row[i] = blend_xor(src[i], row[i]);
break;
}
}
}
}
}