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Fix half pixel offset and add filtering in sw rendering

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Signed-off-by: Dušan Poizl <nou.spiro@gmail.com>
This commit is contained in:
Dušan Poizl
2024-12-05 16:02:46 +01:00
parent be1e65251d
commit 45ee9b7258
1 changed files with 44 additions and 21 deletions
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imagewidget.cpp
+26 -3
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@@ -352,7 +352,7 @@ void swPaint(std::shared_ptr<RawImage> &rawImage, float dx, float dy, float scal
int width = widget->width();
int height = widget->height();
QImage img(width, height, QImage::Format_RGB32);
img.fill(Qt::gray);
img.fill(Qt::darkGray);
int64_t ox = dx;
int64_t oy = dy;
@@ -380,7 +380,7 @@ void swPaint(std::shared_ptr<RawImage> &rawImage, float dx, float dy, float scal
{
uint32_t *pixels = (uint32_t*)(img.scanLine(y));
float iptr;
float fy = std::modf((y + oy) * iscale - 0.5f, &iptr);
float fy = std::modf((y + oy) * iscale, &iptr);
int64_t py = iptr;
int64_t w = py * rawImage->widthBytes();
int64_t w2 = w;
@@ -389,7 +389,7 @@ void swPaint(std::shared_ptr<RawImage> &rawImage, float dx, float dy, float scal
for(int64_t x = std::max((int64_t)0, -ox); x < width; x++)
{
float fx = std::modf((x + ox) * iscale - 0.5f, &iptr);
float fx = std::modf((x + ox) * iscale, &iptr);
int px = iptr;
int px2 = px + 1 < imgWidth ? px + 1 : px;
if(px >= imgWidth)break;
@@ -400,6 +400,8 @@ void swPaint(std::shared_ptr<RawImage> &rawImage, float dx, float dy, float scal
r[0] = src[w + px * 4 + 0];
g[0] = src[w + px * 4 + 1];
b[0] = src[w + px * 4 + 2];
if(FILTERING)
{
r[1] = src[w + px2 * 4 + 0];
g[1] = src[w + px2 * 4 + 1];
b[1] = src[w + px2 * 4 + 2];
@@ -410,15 +412,21 @@ void swPaint(std::shared_ptr<RawImage> &rawImage, float dx, float dy, float scal
g[3] = src[w2 + px2 * 4 + 1];
b[3] = src[w2 + px2 * 4 + 2];
}
}
else
{
r[0] = src[w + px];
if(FILTERING)
{
r[2] = src[w2 + px];
r[1] = src[w + px2];
r[3] = src[w2 + px2];
}
}
uint32_t rgb = 0xff000000;
if(FILTERING)
{
if(rawImage->channels() > 1)
{
rgb |= (uint8_t)(mtf(0, ((r[3] * fx + r[2] * (1.0f - fx)) * fy + (r[1] * fx + r[0] * (1.0f - fx)) * (1.0f - fy)) / s) * 255.0f) << 16;
@@ -430,6 +438,21 @@ void swPaint(std::shared_ptr<RawImage> &rawImage, float dx, float dy, float scal
uint32_t v = (uint8_t)(mtf(0, ((r[3] * fx + r[2] * (1.0f - fx)) * fy + (r[1] * fx + r[0] * (1.0f - fx)) * (1.0f - fy)) / s) * 255.0f);
rgb = 0xff000000 | (v << 16) | (v << 8) | v;
}
}
else
{
if(rawImage->channels() > 1)
{
rgb |= (uint8_t)(mtf(0, r[0] / s) * 255.0f) << 16;
rgb |= (uint8_t)(mtf(1, g[0] / s) * 255.0f) << 8;
rgb |= (uint8_t)(mtf(1, b[0] / s) * 255.0f);
}
else
{
uint32_t v = (uint8_t)(mtf(0, r[0] / s) * 255.0f);
rgb = 0xff000000 | (v << 16) | (v << 8) | v;
}
}
pixels[x] = rgb;
}
}