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Merge pull request #8654 from Robyt3/Image-Manipulation-Minor-Refactoring

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Minor refactoring of `DilateImage`, `ResizeImage` and related functions
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Dennis Felsing 2024-07-26 22:41:00 +00:00 committed by GitHub
parent 08f955bff0 f79ea492fa
commit a1ef70c114
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GPG key ID: B5690EEEBB952194
1 changed files with 51 additions and 100 deletions
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151
src/engine/gfx/image_manipulation.cpp
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@ -2,38 +2,35 @@
#include <base/math.h>
#include <base/system.h>
#define TW_DILATE_ALPHA_THRESHOLD 10
static constexpr int DILATE_BPP = 4; // RGBA assumed
static constexpr uint8_t DILATE_ALPHA_THRESHOLD = 10;
static void Dilate(int w, int h, const uint8_t *pSrc, uint8_t *pDest, uint8_t AlphaThreshold = TW_DILATE_ALPHA_THRESHOLD)
static void Dilate(int w, int h, const uint8_t *pSrc, uint8_t *pDest)
{
const int BPP = 4; // RGBA assumed
int ix, iy;
const int aDirX[] = {0, -1, 1, 0};
const int aDirY[] = {-1, 0, 0, 1};
int AlphaCompIndex = BPP - 1;
int m = 0;
for(int y = 0; y < h; y++)
{
for(int x = 0; x < w; x++, m += BPP)
for(int x = 0; x < w; x++, m += DILATE_BPP)
{
for(int i = 0; i < BPP; ++i)
for(int i = 0; i < DILATE_BPP; ++i)
pDest[m + i] = pSrc[m + i];
if(pSrc[m + AlphaCompIndex] > AlphaThreshold)
if(pSrc[m + DILATE_BPP - 1] > DILATE_ALPHA_THRESHOLD)
continue;
int aSumOfOpaque[] = {0, 0, 0};
int Counter = 0;
for(int c = 0; c < 4; c++)
{
ix = clamp(x + aDirX[c], 0, w - 1);
iy = clamp(y + aDirY[c], 0, h - 1);
int k = iy * w * BPP + ix * BPP;
if(pSrc[k + AlphaCompIndex] > AlphaThreshold)
const int ClampedX = clamp(x + aDirX[c], 0, w - 1);
const int ClampedY = clamp(y + aDirY[c], 0, h - 1);
const int SrcIndex = ClampedY * w * DILATE_BPP + ClampedX * DILATE_BPP;
if(pSrc[SrcIndex + DILATE_BPP - 1] > DILATE_ALPHA_THRESHOLD)
{
for(int p = 0; p < BPP - 1; ++p)
aSumOfOpaque[p] += pSrc[k + p];
for(int p = 0; p < DILATE_BPP - 1; ++p)
aSumOfOpaque[p] += pSrc[SrcIndex + p];
++Counter;
break;
}
@ -41,29 +38,28 @@ static void Dilate(int w, int h, const uint8_t *pSrc, uint8_t *pDest, uint8_t Al
if(Counter > 0)
{
for(int i = 0; i < BPP - 1; ++i)
for(int i = 0; i < DILATE_BPP - 1; ++i)
{
aSumOfOpaque[i] /= Counter;
pDest[m + i] = (uint8_t)aSumOfOpaque[i];
}
pDest[m + AlphaCompIndex] = 255;
pDest[m + DILATE_BPP - 1] = 255;
}
}
}
}
static void CopyColorValues(int w, int h, int BPP, const uint8_t *pSrc, uint8_t *pDest)
static void CopyColorValues(int w, int h, const uint8_t *pSrc, uint8_t *pDest)
{
int m = 0;
for(int y = 0; y < h; y++)
{
for(int x = 0; x < w; x++, m += BPP)
for(int x = 0; x < w; x++, m += DILATE_BPP)
{
for(int i = 0; i < BPP - 1; ++i)
if(pDest[m + DILATE_BPP - 1] == 0)
{
if(pDest[m + 3] == 0)
pDest[m + i] = pSrc[m + i];
mem_copy(&pDest[m], &pSrc[m], DILATE_BPP - 1);
}
}
}
@ -76,18 +72,18 @@ void DilateImage(uint8_t *pImageBuff, int w, int h)
void DilateImageSub(uint8_t *pImageBuff, int w, int h, int x, int y, int sw, int sh)
{
const int BPP = 4; // RGBA assumed
uint8_t *apBuffer[2] = {NULL, NULL};
uint8_t *apBuffer[2] = {nullptr, nullptr};
apBuffer[0] = (uint8_t *)malloc((size_t)sw * sh * sizeof(uint8_t) * BPP);
apBuffer[1] = (uint8_t *)malloc((size_t)sw * sh * sizeof(uint8_t) * BPP);
uint8_t *pBufferOriginal = (uint8_t *)malloc((size_t)sw * sh * sizeof(uint8_t) * BPP);
const size_t ImageSize = (size_t)sw * sh * sizeof(uint8_t) * DILATE_BPP;
apBuffer[0] = (uint8_t *)malloc(ImageSize);
apBuffer[1] = (uint8_t *)malloc(ImageSize);
uint8_t *pBufferOriginal = (uint8_t *)malloc(ImageSize);
for(int Y = 0; Y < sh; ++Y)
{
int SrcImgOffset = ((y + Y) * w * BPP) + (x * BPP);
int DstImgOffset = (Y * sw * BPP);
int CopySize = sw * BPP;
int SrcImgOffset = ((y + Y) * w * DILATE_BPP) + (x * DILATE_BPP);
int DstImgOffset = (Y * sw * DILATE_BPP);
int CopySize = sw * DILATE_BPP;
mem_copy(&pBufferOriginal[DstImgOffset], &pImageBuff[SrcImgOffset], CopySize);
}
@ -99,16 +95,16 @@ void DilateImageSub(uint8_t *pImageBuff, int w, int h, int x, int y, int sw, int
Dilate(sw, sh, apBuffer[1], apBuffer[0]);
}
CopyColorValues(sw, sh, BPP, apBuffer[0], pBufferOriginal);
CopyColorValues(sw, sh, apBuffer[0], pBufferOriginal);
free(apBuffer[0]);
free(apBuffer[1]);
for(int Y = 0; Y < sh; ++Y)
{
int SrcImgOffset = ((y + Y) * w * BPP) + (x * BPP);
int DstImgOffset = (Y * sw * BPP);
int CopySize = sw * BPP;
int SrcImgOffset = ((y + Y) * w * DILATE_BPP) + (x * DILATE_BPP);
int DstImgOffset = (Y * sw * DILATE_BPP);
int CopySize = sw * DILATE_BPP;
mem_copy(&pImageBuff[SrcImgOffset], &pBufferOriginal[DstImgOffset], CopySize);
}
@ -125,18 +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;
@ -146,79 +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);
}
}
}