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ketmar patch for getPixel. inefficient but convenient

This commit is contained in:
Adam D. Ruppe 2016-04-23 10:02:01 -04:00
parent c6f83abe14
commit c0868ad46a
1 changed files with 25 additions and 0 deletions
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25
color.d
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@ -764,6 +764,9 @@ interface MemoryImage {
/// Image height, in pixels
int height() const;
/// Get image pixel. Slow, but returns valid RGBA color (completely transparent for off-image pixels).
Color getPixel(int x, int y) const;
}
/// An image that consists of indexes into a color palette. Use getAsTrueColorImage() if you don't care about palettes
@ -785,6 +788,18 @@ class IndexedImage : MemoryImage {
return _height;
}
override Color getPixel(int x, int y) const @trusted {
if (x >= 0 && y >= 0 && x < _width && y < _height) {
uint pos = y*_width+x;
if (pos >= data.length) return Color(0, 0, 0, 0);
ubyte b = data.ptr[pos];
if (b >= palette.length) return Color(0, 0, 0, 0);
return palette.ptr[b];
} else {
return Color(0, 0, 0, 0);
}
}
private int _width;
private int _height;
@ -883,6 +898,16 @@ class TrueColorImage : MemoryImage {
///.
override int height() const { return _height; }
override Color getPixel(int x, int y) const @trusted {
if (x >= 0 && y >= 0 && x < _width && y < _height) {
uint pos = y*_width+x;
if (pos >= imageData.bytes.length/4) return Color(0, 0, 0, 0);
return imageData.colors.ptr[pos];
} else {
return Color(0, 0, 0, 0);
}
}
/// .
this(int w, int h) {
_width = w;