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Refactor stretching blitters 

* Fixes skipped pixels
* Improves readability
This commit is contained in:
Alexander Batalov 2022-12-08 16:34:38 +03:00
parent 602ef7c1e1
commit 884034f0bf
1 changed files with 25 additions and 43 deletions
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68
src/draw.cc
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@ -152,74 +152,56 @@ void bufferDrawRectShadowed(unsigned char* buf, int pitch, int left, int top, in
// 0x4D33F0
void blitBufferToBufferStretch(unsigned char* src, int srcWidth, int srcHeight, int srcPitch, unsigned char* dest, int destWidth, int destHeight, int destPitch)
{
int heightRatio = (destHeight << 16) / srcHeight;
int widthRatio = (destWidth << 16) / srcWidth;
int stepX = (destWidth << 16) / srcWidth;
int stepY = (destHeight << 16) / srcHeight;
int v1 = 0;
int v2 = heightRatio;
for (int srcY = 0; srcY < srcHeight; srcY += 1) {
int v3 = widthRatio;
int v4 = (heightRatio * srcY) >> 16;
int v5 = v2 >> 16;
int v6 = 0;
int startDestY = (srcY * stepY) >> 16;
int endDestY = ((srcY + 1) * stepY) >> 16;
unsigned char* c = src + v1;
unsigned char* currSrc = src + srcPitch * srcY;
for (int srcX = 0; srcX < srcWidth; srcX += 1) {
int v7 = v3 >> 16;
int v8 = v6 >> 16;
int startDestX = (srcX * stepX) >> 16;
int endDestX = ((srcX + 1) * stepX) >> 16;
unsigned char* v9 = dest + destPitch * v4 + v8;
for (int destY = v4; destY < v5; destY += 1) {
for (int destX = v8; destX < v7; destX += 1) {
*v9++ = *c;
for (int destY = startDestY; destY < endDestY; destY += 1) {
unsigned char* currDest = dest + destPitch * destY + startDestX;
for (int destX = startDestX; destX < endDestX; destX += 1) {
*currDest++ = *currSrc;
}
v9 += destPitch;
}
v3 += widthRatio;
c++;
v6 += widthRatio;
currSrc++;
}
v1 += srcPitch;
v2 += heightRatio;
}
}
// 0x4D3560
void blitBufferToBufferStretchTrans(unsigned char* src, int srcWidth, int srcHeight, int srcPitch, unsigned char* dest, int destWidth, int destHeight, int destPitch)
{
int heightRatio = (destHeight << 16) / srcHeight;
int widthRatio = (destWidth << 16) / srcWidth;
int stepX = (destWidth << 16) / srcWidth;
int stepY = (destHeight << 16) / srcHeight;
int v1 = 0;
int v2 = heightRatio;
for (int srcY = 0; srcY < srcHeight; srcY += 1) {
int v3 = widthRatio;
int v4 = (heightRatio * srcY) >> 16;
int v5 = v2 >> 16;
int v6 = 0;
int startDestY = (srcY * stepY) >> 16;
int endDestY = ((srcY + 1) * stepY) >> 16;
unsigned char* c = src + v1;
unsigned char* currSrc = src + srcPitch * srcY;
for (int srcX = 0; srcX < srcWidth; srcX += 1) {
int v7 = v3 >> 16;
int v8 = v6 >> 16;
int startDestX = (srcX * stepX) >> 16;
int endDestX = ((srcX + 1) * stepX) >> 16;
if (*c != 0) {
unsigned char* v9 = dest + destPitch * v4 + v8;
for (int destY = v4; destY < v5; destY += 1) {
for (int destX = v8; destX < v7; destX += 1) {
*v9++ = *c;
if (*currSrc != 0) {
for (int destY = startDestY; destY < endDestY; destY += 1) {
unsigned char* currDest = dest + destPitch * destY + startDestX;
for (int destX = startDestX; destX < endDestX; destX += 1) {
*currDest++ = *currSrc;
}
v9 += destPitch;
}
}
v3 += widthRatio;
c++;
v6 += widthRatio;
currSrc++;
}
v1 += srcPitch;
v2 += heightRatio;
}
}