🚸 (video): Center images

Essentially for pictos
leka · May 22, 2022 · 8cdd254 · 8cdd254
1 parent b184e1e
commit 8cdd254
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Showing 3 changed files with 24 additions and 6 deletions.
diff --git a/drivers/CoreVideo/include/internal/corevideo_config.h b/drivers/CoreVideo/include/internal/corevideo_config.h
@@ -25,6 +25,8 @@ namespace lcd {
 	// TODO : it should be instanciated and passed to objects that need it
 	namespace property {
 
+		inline constexpr uint8_t pixel_memory_size = 4;	  // ARGB, in bytes
+
 		// clang-format off
 		inline constexpr uint16_t VSA  = lcd::otm8009a::landscape::vsync;   // Vertical start active time in units of lines
 		inline constexpr uint16_t VBP  = lcd::otm8009a::landscape::vbp;	    // Vertical Back Porch time in units of lines

diff --git a/drivers/CoreVideo/source/CoreDMA2D.cpp b/drivers/CoreVideo/source/CoreDMA2D.cpp
@@ -81,7 +81,16 @@ void CoreDMA2D::transferImage(uint32_t width, uint32_t height, uint32_t width_of
 	_hdma2d.LayerCfg[1].InputOffset = width_offset;
 	_hdma2d.Init.OutputOffset		= lcd::dimension::width - width;
 
-	transferData(jpeg::decoded_buffer_address, lcd::frame_buffer_address, width, height);
+	auto memory_offset_to_center = [](auto image_width, auto image_height) {
+		auto unoccupied_width  = lcd::dimension::width - image_width;
+		auto unoccupied_height = lcd::dimension::height - image_height;
+
+		return lcd::property::pixel_memory_size *
+			   (unoccupied_width / 2 + unoccupied_height / 2 * lcd::dimension::width);
+	};
+
+	transferData(jpeg::decoded_buffer_address, lcd::frame_buffer_address + memory_offset_to_center(width, height),
+				 width, height);
 }
 
 auto CoreDMA2D::getHandle() -> DMA2D_HandleTypeDef &

diff --git a/drivers/CoreVideo/tests/CoreDMA2D_test.cpp b/drivers/CoreVideo/tests/CoreDMA2D_test.cpp
@@ -151,18 +151,25 @@ TEST_F(CoreDMA2DTest, transferImage)
 	ASSERT_EQ(handle.Init.OutputOffset, lcd::dimension::width - image_width);
 }
 
-TEST_F(CoreDMA2DTest, transferImageDifferentWidth)
+TEST_F(CoreDMA2DTest, transferImageCentered)
 {
-	uint16_t image_width  = 400;
-	uint16_t image_height = 400;
+	uint16_t image_width  = 123;
+	uint16_t image_height = 456;
+
+	auto left_pixels_offset_to_center = (lcd::dimension::width - image_width) / 2;
+	auto top_pixel_offset_to_center	  = (lcd::dimension::height - image_height) / 2;
+
+	auto memory_offset_to_center = lcd::property::pixel_memory_size *
+								   (left_pixels_offset_to_center + top_pixel_offset_to_center * lcd::dimension::width);
 
 	{
 		InSequence seq;
 
 		EXPECT_CALL(halmock, HAL_DMA2D_Init).Times(1).WillRepeatedly(Return(HAL_OK));
 		EXPECT_CALL(halmock, HAL_DMA2D_ConfigLayer).Times(1).WillRepeatedly(Return(HAL_OK));
-		EXPECT_CALL(halmock, HAL_DMA2D_Start_IT(_, jpeg::decoded_buffer_address, lcd::frame_buffer_address, image_width,
-												image_height))
+		EXPECT_CALL(halmock,
+					HAL_DMA2D_Start_IT(_, jpeg::decoded_buffer_address,
+									   lcd::frame_buffer_address + memory_offset_to_center, image_width, image_height))
 			.Times(1);
 	}