}
+static inline unsigned char clamp(int x)
+{
+ if (x <= 0) {
+ return 0;
+ }
+ if (x > 255) {
+ return 255;
+ }
+ return (unsigned char) x;
+}
+
+static inline unsigned char clamp(float x)
+{
+ if (x <= 0.0f) {
+ return 0;
+ }
+ if (x > 255.0f) {
+ return 255;
+ }
+ return (unsigned char) (x + 0.5f);
+}
+
+
QImage
-ApiSurface::qimageFromRawImage(const image::Image *image)
+ApiSurface::qimageFromRawImage(const image::Image *image,
+ float lowerValue,
+ float upperValue,
+ bool opaque,
+ bool alpha)
{
QImage img;
int width = image->width;
img = QImage(width, height, QImage::Format_ARGB32);
+ int offset = - lowerValue * 255;
+ int scale = 256 / (upperValue - lowerValue);
+
+ float offset_f = - lowerValue;
+ float scale_f = 255.0f / (upperValue - lowerValue);
+
+ int aMask = (opaque || alpha) ? 0xff : 0;
+
const unsigned char *srcRow = image->start();
for (int y = 0; y < height; ++y) {
QRgb *dst = (QRgb *)img.scanLine(y);
for (int x = 0; x < width; ++x) {
unsigned char rgba[4] = {0, 0, 0, 0xff};
for (int c = 0; c < image->channels; ++c) {
- rgba[c] = *src++;
+ rgba[c] = clamp(((*src++ + offset) * scale) >> 8);
}
if (image->channels == 1) {
// Use gray-scale instead of red
rgba[1] = rgba[0];
rgba[2] = rgba[0];
}
+ if (alpha) {
+ rgba[2] = rgba[1] = rgba[0] = rgba[3];
+ }
+ rgba[3] |= aMask;
dst[x] = qRgba(rgba[0], rgba[1], rgba[2], rgba[3]);
}
} else {
for (int x = 0; x < width; ++x) {
unsigned char rgba[4] = {0, 0, 0, 0xff};
for (int c = 0; c < image->channels; ++c) {
- float f = *src++;
- unsigned char u;
- if (f >= 1.0f) {
- u = 255;
- } else if (f <= 0.0f) {
- u = 0;
- } else {
- u = f * 255 + 0.5;
- }
- rgba[c] = u;
+ rgba[c] = clamp((*src++ + offset_f)*scale_f);
}
if (image->channels == 1) {
// Use gray-scale instead of red
rgba[1] = rgba[0];
rgba[2] = rgba[0];
}
+ if (alpha) {
+ rgba[2] = rgba[1] = rgba[0] = rgba[3];
+ }
+ rgba[3] |= aMask;
dst[x] = qRgba(rgba[0], rgba[1], rgba[2], rgba[3]);
}
}