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Minor refactoring of ResizeImage and related functions

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Avoid duplicate code by using arrays and loops.

Move local variable declarations closer to their usages.

Use `mem_copy` instead of for-loops.
This commit is contained in:
Robert Müller 2024-07-03 23:38:43 +02:00
parent bfc4902910
commit f79ea492fa
1 changed files with 21 additions and 66 deletions
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87
src/engine/gfx/image_manipulation.cpp
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@ -121,18 +121,15 @@ static float CubicHermite(float A, float B, float C, float D, float t)
return (a * t * t * t) + (b * t * t) + (c * t) + d;
}
static void GetPixelClamped(const uint8_t *pSourceImage, int x, int y, uint32_t W, uint32_t H, size_t BPP, uint8_t aTmp[])
static void GetPixelClamped(const uint8_t *pSourceImage, int x, int y, uint32_t W, uint32_t H, size_t BPP, uint8_t aSample[4])
{
x = clamp<int>(x, 0, (int)W - 1);
y = clamp<int>(y, 0, (int)H - 1);
for(size_t i = 0; i < BPP; i++)
{
aTmp[i] = pSourceImage[x * BPP + (W * BPP * y) + i];
}
mem_copy(aSample, &pSourceImage[x * BPP + (W * BPP * y)], BPP);
}
static void SampleBicubic(const uint8_t *pSourceImage, float u, float v, uint32_t W, uint32_t H, size_t BPP, uint8_t aSample[])
static void SampleBicubic(const uint8_t *pSourceImage, float u, float v, uint32_t W, uint32_t H, size_t BPP, uint8_t aSample[4])
{
float X = (u * W) - 0.5f;
int xInt = (int)X;
@ -142,79 +139,37 @@ static void SampleBicubic(const uint8_t *pSourceImage, float u, float v, uint32_
int yInt = (int)Y;
float yFract = Y - std::floor(Y);
uint8_t aPX00[4];
uint8_t aPX10[4];
uint8_t aPX20[4];
uint8_t aPX30[4];
uint8_t aPX01[4];
uint8_t aPX11[4];
uint8_t aPX21[4];
uint8_t aPX31[4];
uint8_t aPX02[4];
uint8_t aPX12[4];
uint8_t aPX22[4];
uint8_t aPX32[4];
uint8_t aPX03[4];
uint8_t aPX13[4];
uint8_t aPX23[4];
uint8_t aPX33[4];
GetPixelClamped(pSourceImage, xInt - 1, yInt - 1, W, H, BPP, aPX00);
GetPixelClamped(pSourceImage, xInt + 0, yInt - 1, W, H, BPP, aPX10);
GetPixelClamped(pSourceImage, xInt + 1, yInt - 1, W, H, BPP, aPX20);
GetPixelClamped(pSourceImage, xInt + 2, yInt - 1, W, H, BPP, aPX30);
GetPixelClamped(pSourceImage, xInt - 1, yInt + 0, W, H, BPP, aPX01);
GetPixelClamped(pSourceImage, xInt + 0, yInt + 0, W, H, BPP, aPX11);
GetPixelClamped(pSourceImage, xInt + 1, yInt + 0, W, H, BPP, aPX21);
GetPixelClamped(pSourceImage, xInt + 2, yInt + 0, W, H, BPP, aPX31);
GetPixelClamped(pSourceImage, xInt - 1, yInt + 1, W, H, BPP, aPX02);
GetPixelClamped(pSourceImage, xInt + 0, yInt + 1, W, H, BPP, aPX12);
GetPixelClamped(pSourceImage, xInt + 1, yInt + 1, W, H, BPP, aPX22);
GetPixelClamped(pSourceImage, xInt + 2, yInt + 1, W, H, BPP, aPX32);
GetPixelClamped(pSourceImage, xInt - 1, yInt + 2, W, H, BPP, aPX03);
GetPixelClamped(pSourceImage, xInt + 0, yInt + 2, W, H, BPP, aPX13);
GetPixelClamped(pSourceImage, xInt + 1, yInt + 2, W, H, BPP, aPX23);
GetPixelClamped(pSourceImage, xInt + 2, yInt + 2, W, H, BPP, aPX33);
uint8_t aaaSamples[4][4][4];
for(int y = 0; y < 4; ++y)
{
for(int x = 0; x < 4; ++x)
{
GetPixelClamped(pSourceImage, xInt + x - 1, yInt + y - 1, W, H, BPP, aaaSamples[x][y]);
}
}
for(size_t i = 0; i < BPP; i++)
{
float Clmn0 = CubicHermite(aPX00[i], aPX10[i], aPX20[i], aPX30[i], xFract);
float Clmn1 = CubicHermite(aPX01[i], aPX11[i], aPX21[i], aPX31[i], xFract);
float Clmn2 = CubicHermite(aPX02[i], aPX12[i], aPX22[i], aPX32[i], xFract);
float Clmn3 = CubicHermite(aPX03[i], aPX13[i], aPX23[i], aPX33[i], xFract);
float Valuef = CubicHermite(Clmn0, Clmn1, Clmn2, Clmn3, yFract);
Valuef = clamp<float>(Valuef, 0.0f, 255.0f);
aSample[i] = (uint8_t)Valuef;
float aRows[4];
for(int y = 0; y < 4; ++y)
{
aRows[y] = CubicHermite(aaaSamples[0][y][i], aaaSamples[1][y][i], aaaSamples[2][y][i], aaaSamples[3][y][i], xFract);
}
aSample[i] = (uint8_t)clamp<float>(CubicHermite(aRows[0], aRows[1], aRows[2], aRows[3], yFract), 0.0f, 255.0f);
}
}
static void ResizeImage(const uint8_t *pSourceImage, uint32_t SW, uint32_t SH, uint8_t *pDestinationImage, uint32_t W, uint32_t H, size_t BPP)
{
uint8_t aSample[4];
int y, x;
for(y = 0; y < (int)H; ++y)
for(int y = 0; y < (int)H; ++y)
{
float v = (float)y / (float)(H - 1);
for(x = 0; x < (int)W; ++x)
for(int x = 0; x < (int)W; ++x)
{
float u = (float)x / (float)(W - 1);
uint8_t aSample[4];
SampleBicubic(pSourceImage, u, v, SW, SH, BPP, aSample);
for(size_t i = 0; i < BPP; ++i)
{
pDestinationImage[x * BPP + ((W * BPP) * y) + i] = aSample[i];
}
mem_copy(&pDestinationImage[x * BPP + ((W * BPP) * y)], aSample, BPP);
}
}
}