Kha

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On HTML5 and android-native targets, the following sample will output "Found some data" to the console. On iOS, however, "Found NO data" will be outputted to the console instead.

package;

class Main {
    public static function main() {
        kha.System.start({}, function(window) {
            kha.Assets.loadEverything(function() {
                var image:kha.Image = kha.Assets.images.custom_04b03;
                var copy:kha.Image = kha.Image.createRenderTarget(image.width, image.height);
                copy.g2.begin(true, kha.Color.Transparent);
                copy.g2.drawImage(image, 0, 0);
                copy.g2.end();
                var bytes = copy.getPixels();
                var i = 0;
                for (y in 0...image.height) {
                    for (x in 0...image.width) {
                        var alpha = bytes.get((y * image.width + x) * 4 + 3);
                        if (alpha > 0) {
                            i++;
                        }
                    }
                }
                if (i > 0) {
                    trace("Found some data");
                } else {
                    trace("Found NO data");
                }
                kha.System.notifyOnFrames(function render(framebuffers:Array<kha.Framebuffer>):Void {
                    var framebuffer = framebuffers[0];
                    framebuffer.g2.begin();
                    framebuffer.g2.end();
                });
            });
        });
    }
}

Clone from: https://github.com/Joncom/Empty/tree/ISSUE_953

Just realized, it appears that getPixels actually works fine if using OpenGL, and not Metal!

node Kha/make ios --graphics opengl

Booo!