帧颜色格式优化

render_2D/tests/Frame_Pixel_Format_Test.cpp

@@ -0,0 +1,35 @@
+#include <render_2D/base/Frame_2D.hpp>
+#include <gtest/gtest.h>
+namespace {
+using namespace aethera;
+using namespace aethera::render_2d;
+void paint_translucent_red(Frame_2D& frame) {
+    auto& target = detail::Frame_2D_Access::render_target(&frame);
+    detail::Painter painter(target, Size{1, 1});
+    painter.rect(Rect_F{0.0, 0.0, 1.0, 1.0},
+                 Pen{Color::transparent(), 0.0, Line_Style::none},
+                 Brush{Color{255, 0, 0, 128}, Brush_Style::solid});
+}
+}
+TEST(frame_pixel_format, publishes_native_bgra_premultiplied_by_default) {
+    Frame_2D frame{Frame_Identity{1, 0}};
+    paint_translucent_red(frame);
+    const auto pixels = frame.output_pixels();
+    ASSERT_EQ(pixels.format, Pixel_Format::bgra8_premultiplied);
+    ASSERT_EQ(pixels.bytes.size(), 4U);
+    EXPECT_EQ(std::to_integer<unsigned>(pixels.bytes[0]), 0U);
+    EXPECT_EQ(std::to_integer<unsigned>(pixels.bytes[1]), 0U);
+    EXPECT_EQ(std::to_integer<unsigned>(pixels.bytes[2]), 128U);
+    EXPECT_EQ(std::to_integer<unsigned>(pixels.bytes[3]), 128U);
+}
+TEST(frame_pixel_format, uses_blend2d_to_publish_straight_rgba) {
+    Frame_2D frame{Frame_Identity{2, 0}, Pixel_Format::rgba8};
+    paint_translucent_red(frame);
+    const auto pixels = frame.output_pixels();
+    ASSERT_EQ(pixels.format, Pixel_Format::rgba8);
+    ASSERT_EQ(pixels.bytes.size(), 4U);
+    EXPECT_GE(std::to_integer<unsigned>(pixels.bytes[0]), 254U);
+    EXPECT_EQ(std::to_integer<unsigned>(pixels.bytes[1]), 0U);
+    EXPECT_EQ(std::to_integer<unsigned>(pixels.bytes[2]), 0U);
+    EXPECT_EQ(std::to_integer<unsigned>(pixels.bytes[3]), 128U);
+}