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Minor refactoring of DilateImage and related functions

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Add constants for BPP and alpha threshold during Dilate, as dilating only works for RGBA images and we only use a fixed alpha threshold.

Move local variable declarations closer to their usages.

Use `mem_copy` instead of for-loop.

Use `nullptr` instead of `NULL`.
This commit is contained in:
Robert Müller 2024-07-03 23:27:56 +02:00
parent 08f955bff0
commit bfc4902910
1 changed files with 30 additions and 34 deletions
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64
src/engine/gfx/image_manipulation.cpp
View file

@ -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);
}