void ZLEwlImageData::copyFrom(const ZLImageData &source, unsigned int targetX __UNUSED__, unsigned int targetY __UNUSED__) {
int sW = source.width();
int sH = source.height();
ZLEwlImageData *source_image = (ZLEwlImageData *)&source;
memcpy(myImageData, source_image->getImageData(), sW * sH);
}
void ZLGtkImageData::copyFrom(const ZLImageData &source, unsigned int targetX, unsigned int targetY) {
gdk_pixbuf_copy_area(
((const ZLGtkImageData&)source).myPixbuf,
0, 0,
source.width(), source.height(),
myPixbuf,
targetX, targetY
);
}
void ZLWin32PaintContext::drawImage(int x, int y, const ZLImageData &image) {
ZLWin32ImageData &win32Image = (ZLWin32ImageData&)image;
const BYTE *pixels = win32Image.pixels(myBackgroundColor);
if (pixels != 0) {
const int width = image.width();
const int height = image.height();
StretchDIBits(myDisplayContext,
x, y - height, width, height,
0, 0, width, height,
pixels, win32Image.info(), DIB_RGB_COLORS, SRCCOPY);
}
}
void ZLWin32ImageData::copyFrom(const ZLImageData &source, unsigned int targetX, unsigned int targetY) {
ZLWin32ImageData &win32source = (ZLWin32ImageData&)source;
if ((myArray == 0) || (win32source.myArray == 0)) {
return;
}
int height = source.height();
int bytes = source.width() * myBytesPerPixel;
BYTE *src = win32source.myArray + win32source.myBytesPerLine * (win32source.myHeight - 1);
BYTE *dst = myArray + (myHeight - targetY - 1) * myBytesPerLine + targetX * myBytesPerPixel;
for (int i = 0; i < height; ++i) {
memcpy(dst, src, bytes);
dst -= myBytesPerLine;
src -= win32source.myBytesPerLine;
}
}
int ZLPaintContext::imageHeight(const ZLImageData &image, int width, int height, ScalingType type) const {
const int origWidth = image.width();
const int origHeight = image.height();
if (origWidth == 0 || origHeight == 0) {
return 0;
}
if ((origWidth <= width) && (origHeight <= height)) {
if (type == SCALE_REDUCE_SIZE) {
return origHeight;
}
} else {
width = std::min(width, origWidth);
height = std::min(height, origHeight);
}
if (origWidth * height > origHeight * width) {
return (origHeight * width + origWidth / 2) / origWidth;
}
return height;
}
void floyd_steinberg_dither(ZLImageData &data)
{
ZLEwlImageData &i = (ZLEwlImageData&)data;
int w = data.width();
int h = data.height();
unsigned char *c = (unsigned char*)i.getImageData();
int xi;
unsigned char *x;
int oldpixel, newpixel;
int quant_error;
extern int xcb_pal_colours;
int factor = 255 / (xcb_pal_colours - 1);
int factor_half = factor>>1;
for(int j = 0; j < h; j++)
for(int i = 0; i < w; i++) {
x = c + j * w + i;
oldpixel = *x;
newpixel = (oldpixel + factor_half) / factor;
newpixel *= factor;
if(newpixel > 255)
newpixel = 255;
if(newpixel < 0)
newpixel = 0;
*x = newpixel;
quant_error = oldpixel - newpixel;
if(i < w - 1) {
x++;
xi = *x;
xi = xi + 7 * quant_error / 16;
if(xi <= 0)
*x = 0;
else if (xi >= 255)
*x = 255;
else
*x = xi;
}
x = c + (j+1) * w + i - 1;
if(j < h - 1) {
if(i > 0) {
xi = *x;
xi = xi + 3 * quant_error / 16;
if(xi <= 0)
*x = 0;
else if (xi >= 255)
*x = 255;
else
*x = xi;
}
x++;
xi = *x;
xi = xi + 5 * quant_error / 16;
if(xi <= 0)
*x = 0;
else if (xi >= 255)
*x = 255;
else
*x = xi;
if(i < w - 1) {
x++;
xi = *x;
xi = xi + quant_error / 16;
if(xi <= 0)
*x = 0;
else if (xi >= 255)
*x = 255;
else
*x = xi;
}
}
}
}