统一 Image 和 Sprite 语义到目前的 Image/Sprite 结构体而非之前的类定义

tests/render_pipeline_tests.cpp

@@ -78,11 +78,12 @@ namespace
 		Core::DrawContext ctx(2, 1);
 		ctx.clear_color(RenderData::Color(0, 0, 255, 255));
 
-		RenderData::Image sprite(
+		RenderData::Image image(
 			sprite_pixels,
 			2,
 			1,
 			RenderData::PixelFormat::RGBA5551);
+		RenderData::Sprite sprite(&image, 0, 0, image.width, image.height);
 		ctx.draw_sprite(0, 0, sprite);
 
 		CaptureDisplay display;
@@ -95,6 +96,29 @@ namespace
 		assert(pixels[1] == 0x07E0u);
 	}
 
+	void TestDrawSpriteUsesAtlasSubrect()
+	{
+		const uint16_t atlas_pixels[] = {
+			0xF801u,
+			0x07C1u
+		};
+
+		RenderData::Image atlas(
+			atlas_pixels,
+			2,
+			1,
+			RenderData::PixelFormat::RGBA5551);
+		RenderData::Sprite sprite(&atlas, 1, 0, 1, 1);
+
+		Core::DrawContext ctx(1, 1);
+		ctx.clear_color(RenderData::Color::Blue());
+		ctx.draw_sprite(0, 0, sprite);
+
+		CaptureDisplay display;
+		const Core::FramePixel* pixels = PresentPixels(ctx, display);
+		assert(pixels[0] == 0x07E0u);
+	}
+
 	void TestSpriteAssetLoaderRoundTripsRgba5551()
 	{
 		const std::string path = "render_pipeline_test.sprite";
@@ -216,6 +240,7 @@ int main()
 	TestFrameBufferStoresRgb565();
 	TestImageDefaultsToRgba5551AndReturnsRawPixels();
 	TestDrawSpriteUsesOneBitAlpha();
+	TestDrawSpriteUsesAtlasSubrect();
 	TestSpriteAssetLoaderRoundTripsRgba5551();
 	TestDrawTextUsesBitMaskAndColor();
 	TestDrawTextColorChangesPerCallAndBackgroundFill();