static void compare_colors(const Magick::ColorRGB & expected, const Magick::ColorRGB & observed, bool expected_has_alpha, bool observed_has_alpha ) {
ASSERT_NEAR(expected.red(), observed.red(), 1.1f/(0x1<<8));
ASSERT_NEAR(expected.green(), observed.green(), 1.1f/(0x1<<8));
ASSERT_NEAR(expected.blue(), observed.blue(), 1.1f/(0x1<<8));
if (expected_has_alpha) {
ASSERT_NEAR(expected.alpha(), observed.alpha(), 1.1f / (0x1 << 8));
}
else if (observed_has_alpha) {
ASSERT_NEAR(1.0f, observed.alpha(), 1.1f /(0x1 << 8));
}
}
yuv_image magick_wrapper::xyuv_to_yuv_image_444(const xyuv::conversion_matrix &conversion_matrix) const {
// Analyse the conversion matrix to discover if any plane is not present.
bool has[3] = {false, false, false};
for (uint32_t i = 0; i < 9; i++) {
has[i / 3] = has[i / 3] || (conversion_matrix.rgb_to_yuv[i] != static_cast<pixel_quantum>(0));
}
bool has_a = image.matte();
yuv_image image_out = create_yuv_image_444(
static_cast<uint32_t>(image.columns()),
static_cast<uint32_t>(image.rows()),
has[channel::Y],
has[channel::U],
has[channel::V],
has_a);
// Create pixels with default values.
// Note that this hides the lack of planes.
rgb_color rgb;
yuv_color yuv;
const Magick::PixelPacket *pixels = image.getConstPixels(0, 0, image.columns(), image.rows());
for (uint32_t y = 0; y < image_out.image_h; y++) {
for (uint32_t x = 0; x < image_out.image_w; x++) {
// Fetch color from ImageMagick
const Magick::ColorRGB magick_rgb = Magick::Color(pixels[y * image.columns() + x]);
rgb.r = static_cast<float>(magick_rgb.red());
rgb.g = static_cast<float>(magick_rgb.green());
rgb.b = static_cast<float>(magick_rgb.blue());
// Imagemagick stores alpha as 0.0 = opaque
rgb.a = static_cast<float>(1.0-magick_rgb.alpha());
// Convert to yuv.
to_yuv(&yuv, rgb, conversion_matrix);
// Assign pixel
set_yuv_color(image_out, yuv, x, y);
}
}
// No syncing needed.
return image_out;
}