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This commit is contained in:
Adam D. Ruppe 2019-01-06 17:28:34 -05:00
parent 08efa61c7d
commit e2e8a917e5
1 changed files with 29 additions and 8 deletions
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37
png.d
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@ -25,17 +25,19 @@ void writePng(string filename, MemoryImage mi) {
///
enum PngType {
greyscale = 0, /// The data must be `depth` bits per pixel
truecolor = 2, /// The data will be RGB triples, so `depth * 3` bits per pixel
indexed = 3, /// The data must be `depth` bits per pixel, with a palette attached. Use [writePng] with [IndexedImage] for this mode
greyscale_with_alpha = 4, /// The data must be (grey, alpha) byte pairs for each pixel. Thus `depth * 2` bits per pixel
truecolor_with_alpha = 6 /// The data must be RGBA quads for each pixel. Thus, `depth * 4` bits per pixel.
truecolor = 2, /// The data will be RGB triples, so `depth * 3` bits per pixel. Depth must be 8 or 16.
indexed = 3, /// The data must be `depth` bits per pixel, with a palette attached. Use [writePng] with [IndexedImage] for this mode. Depth must be <= 8.
greyscale_with_alpha = 4, /// The data must be (grey, alpha) byte pairs for each pixel. Thus `depth * 2` bits per pixel. Depth must be 8 or 16.
truecolor_with_alpha = 6 /// The data must be RGBA quads for each pixel. Thus, `depth * 4` bits per pixel. Depth must be 8 or 16.
}
/// Saves an image from an existing array. Note that depth other than 8 may not be implemented yet.
/// Saves an image from an existing array. Note that depth other than 8 may not be implemented yet. Also note depth of 16 must be stored big endian
void writePng(string filename, const ubyte[] data, int width, int height, PngType type, ubyte depth = 8) {
PngHeader h;
h.width = width;
h.height = height;
h.type = cast(ubyte) type;
h.depth = depth;
auto png = blankPNG(h);
addImageDatastreamToPng(data, png);
@ -652,9 +654,28 @@ void addImageDatastreamToPng(const(ubyte)[] data, PNG* png) {
PngHeader h = getHeader(png);
auto bytesPerLine = h.width * 4;
if(h.type == 3)
bytesPerLine = h.width * h.depth / 8;
int bytesPerLine;
switch(h.type) {
case 0:
// FIXME: < 8 depth not supported here but should be
bytesPerLine = h.width * 1 * h.depth / 8;
break;
case 2:
bytesPerLine = h.width * 3 * h.depth / 8;
break;
case 3:
bytesPerLine = h.width * 1 * h.depth / 8;
break;
case 4:
// FIXME: < 8 depth not supported here but should be
bytesPerLine = h.width * 2 * h.depth / 8;
break;
case 6:
bytesPerLine = h.width * 4 * h.depth / 8;
break;
default: assert(0);
}
Chunk dat;
dat.type = ['I', 'D', 'A', 'T'];
int pos = 0;