First Commit

libui-ng/darwin/image.m

@@ -0,0 +1,84 @@
+// 25 june 2016
+#import "uipriv_darwin.h"
+
+struct uiImage {
+	NSImage *i;
+	NSSize size;
+};
+
+uiImage *uiNewImage(double width, double height)
+{
+	uiImage *i;
+
+	i = uiprivNew(uiImage);
+	i->size = NSMakeSize(width, height);
+	i->i = [[NSImage alloc] initWithSize:i->size];
+	return i;
+}
+
+void uiFreeImage(uiImage *i)
+{
+	[i->i release];
+	uiprivFree(i);
+}
+
+void uiImageAppend(uiImage *i, void *pixels, int pixelWidth, int pixelHeight, int byteStride)
+{
+	NSBitmapImageRep *repCalibrated, *repsRGB;
+	int x, y;
+	uint8_t *pix, *data;
+	NSInteger realStride;
+
+	repCalibrated = [[NSBitmapImageRep alloc] initWithBitmapDataPlanes:NULL
+		pixelsWide:pixelWidth
+		pixelsHigh:pixelHeight
+		bitsPerSample:8
+		samplesPerPixel:4
+		hasAlpha:YES
+		isPlanar:NO
+		colorSpaceName:NSCalibratedRGBColorSpace
+		bitmapFormat:0
+		bytesPerRow:0
+		bitsPerPixel:32];
+
+	// Apple doesn't explicitly document this, but we apparently need to use native system endian for the data :|
+	// TODO split this into a utility routine?
+	// TODO find proper documentation
+	// TODO test this on a big-endian system somehow; I have a feeling the above comment is wrong about the diagnosis since the order we are specifying is now 0xAABBGGRR
+	pix = (uint8_t *) pixels;
+	data = (uint8_t *) [repCalibrated bitmapData];
+	realStride = [repCalibrated bytesPerRow];
+	for (y = 0; y < pixelHeight; y++) {
+		for (x = 0; x < pixelWidth * 4; x += 4) {
+			union {
+				uint32_t v32;
+				uint8_t v8[4];
+			} v;
+
+			v.v32 = ((uint32_t) (pix[x + 3])) << 24;
+			v.v32 |= ((uint32_t) (pix[x + 2])) << 16;
+			v.v32 |= ((uint32_t) (pix[x + 1])) << 8;
+			v.v32 |= ((uint32_t) (pix[x]));
+			data[x] = v.v8[0];
+			data[x + 1] = v.v8[1];
+			data[x + 2] = v.v8[2];
+			data[x + 3] = v.v8[3];
+		}
+		pix += byteStride;
+		data += realStride;
+	}
+
+	// we can't call the constructor with this, but we can retag (NOT convert)
+	repsRGB = [repCalibrated bitmapImageRepByRetaggingWithColorSpace:[NSColorSpace sRGBColorSpace]];
+
+	[i->i addRepresentation:repsRGB];
+	[repsRGB setSize:i->size];
+	// don't release repsRGB; it may be equivalent to repCalibrated
+	// do release repCalibrated though; NSImage has a ref to either it or to repsRGB
+	[repCalibrated release];
+}
+
+NSImage *uiprivImageNSImage(uiImage *i)
+{
+	return i->i;
+}