#include <QTime>
#define CHOP255(a) ((255) < (a) ? (255) : (a))
+#define CHOP1255(a) ((a) < (1) ? (1) : ((a) > (255) ? (255) : (a)))
const QColor RGBParadeGenerator::colHighlight(255, 245, 235, 255);
const QColor RGBParadeGenerator::colLight(200, 200, 200, 255);
const uchar RGBParadeGenerator::distRight(40);
const uchar RGBParadeGenerator::distBottom(40);
+struct StructRGB {
+ uint r;
+ uint g;
+ uint b;
+};
+
RGBParadeGenerator::RGBParadeGenerator()
{
}
parade.fill(qRgba(0,0,0,0));
QRgb *col;
- QRgb paradeCol;
- QPoint paradePoint;
QPainter davinci(¶de);
double dx, dy;
const uint wh = paradeSize.height();
const uint iw = image.bytesPerLine();
const uint ih = image.height();
- const uint byteCount = iw*ih;
+ const uint byteCount = iw*ih; // Note that 1 px = 4 B
const uchar offset = 10;
- const int partW = (ww - 2*offset - distRight) / 3;
- const int partH = wh - distBottom;
-
- // To get constant brightness, independant of acceleration factor and input image size
- // Must be a float because the acceleration factor can be high, leading to <1 expected px per px.
- // Divide by 3 because of the 3 components.
- const float brightnessAdjustment = accelFactor * ((float) ww*wh/(byteCount>>3)) / 3;
+ const uint partW = (ww - 2*offset - distRight) / 3;
+ const uint partH = wh - distBottom;
+ // Statistics
uchar minR = 255, minG = 255, minB = 255, maxR = 0, maxG = 0, maxB = 0, r, g, b;
-// qDebug() << "Expecting about " << avgPxPerPx << " pixels per pixel in the RGB parade. Weakening by " << weaken
-// << " with an acceleration factor of " << accelFactor;
+ // Number of input pixels that will fall on one scope pixel.
+ // Must be a float because the acceleration factor can be high, leading to <1 expected px per px.
+ const float pixelDepth = (float)((byteCount>>2) / accelFactor)/(partW*255);
+ const float gain = 255/(8*pixelDepth);
+// qDebug() << "Pixel depth: expected " << pixelDepth << "; Gain: using " << gain << " (acceleration: " << accelFactor << "x)";
+
QImage unscaled(ww-distRight, 256, QImage::Format_ARGB32);
unscaled.fill(qRgba(0, 0, 0, 0));
const float wPrediv = (float)(partW-1)/(iw-1);
+ StructRGB paradeVals[partW][256];
+ for (uint i = 0; i < partW; i++) {
+ for (uint j = 0; j < 256; j++) {
+ paradeVals[i][j].r = 0;
+ paradeVals[i][j].g = 0;
+ paradeVals[i][j].b = 0;
+ }
+ }
+
const uchar *bits = image.bits();
const uint stepsize = 4*accelFactor;
dx = x*wPrediv;
- paradePoint = QPoint((int)dx, r);
- paradeCol = QRgb(unscaled.pixel(paradePoint));
- switch(paintMode) {
- case PaintMode_RGB:
- unscaled.setPixel(paradePoint, qRgba(255,10,10, CHOP255(brightnessAdjustment*16 + qAlpha(paradeCol))));
- break;
- default:
- unscaled.setPixel(paradePoint, qRgba(255,255,255, CHOP255(brightnessAdjustment*16 + qAlpha(paradeCol))));
- break;
- }
-
- paradePoint = QPoint((int) (dx + partW + offset), g);
- paradeCol = QRgb(unscaled.pixel(paradePoint));
- switch(paintMode) {
- case PaintMode_RGB:
- unscaled.setPixel(paradePoint, qRgba(10,255,10, CHOP255(brightnessAdjustment*16 + qAlpha(paradeCol))));
- break;
- default:
- unscaled.setPixel(paradePoint, qRgba(255,255,255, CHOP255(brightnessAdjustment*16 + qAlpha(paradeCol))));
- break;
- }
-
- paradePoint = QPoint((int) (dx + 2*partW + 2*offset), b);
- paradeCol = QRgb(unscaled.pixel(paradePoint));
- switch(paintMode) {
- case PaintMode_RGB:
- unscaled.setPixel(paradePoint, qRgba(10,10,255, CHOP255(brightnessAdjustment*16 + qAlpha(paradeCol))));
- break;
- default:
- unscaled.setPixel(paradePoint, qRgba(255,255,255, CHOP255(brightnessAdjustment*16 + qAlpha(paradeCol))));
- break;
- }
+ paradeVals[(int)dx][r].r++;
+ paradeVals[(int)dx][g].g++;
+ paradeVals[(int)dx][b].b++;
if (r < minR) { minR = r; }
x += stepsize;
x %= iw; // Modulo image width, to represent the current x position in the image
}
+
+
+ const uint offset1 = partW + offset;
+ const uint offset2 = 2*partW + 2*offset;
+ switch(paintMode) {
+ case PaintMode_RGB:
+ for (uint i = 0; i < partW; i++) {
+ for (uint j = 0; j < 256; j++) {
+ unscaled.setPixel(i, j, qRgba(255,10,10, CHOP255(gain*paradeVals[i][j].r)));
+ unscaled.setPixel(i+offset1, j, qRgba(10,255,10, CHOP255(gain*paradeVals[i][j].g)));
+ unscaled.setPixel(i+offset2, j, qRgba(10,10,255, CHOP255(gain*paradeVals[i][j].b)));
+ }
+ }
+ break;
+ default:
+ for (uint i = 0; i < partW; i++) {
+ for (uint j = 0; j < 256; j++) {
+ unscaled.setPixel(i, j, qRgba(255,255,255, CHOP255(gain*paradeVals[i][j].r)));
+ unscaled.setPixel(i+offset1, j, qRgba(255,255,255, CHOP255(gain*paradeVals[i][j].g)));
+ unscaled.setPixel(i+offset2, j, qRgba(255,255,255, CHOP255(gain*paradeVals[i][j].b)));
+ }
+ }
+ break;
+ }
+
// Scale the image to the target height. Scaling is not accomplished before because
// there are only 255 different values which would lead to gaps if the height is not exactly 255.
// Don't use bilinear transformation because the fast transformation meets the goal better.