kms++: Add support for semiplanar YUV422 formats (NV16 and NV61)

Add support for the NV16 and NV61 pixel formats to the PixelFormat
class, the Python API, and the drawing utilities.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

2 files changed, 66 insertions, 9 deletions

diff --git a/kms++util/src/drawing.cpp b/kms++util/src/drawing.cpp
index 194daf8..a329b83 100644
--- a/kms++util/src/drawing.cpp
+++ b/kms++util/src/drawing.cpp
@@ -115,13 +115,9 @@ void draw_rgb_pixel(IFramebuffer& buf, unsigned x, unsigned y, RGB color)
 	}
 }
 
-void draw_yuv422_macropixel(IFramebuffer& buf, unsigned x, unsigned y, YUV yuv1, YUV yuv2)
+static void draw_yuv422_packed_macropixel(IFramebuffer& buf, unsigned x, unsigned y,
+					  YUV yuv1, YUV yuv2)
 {
-	if ((x + 1) >= buf.width() || y >= buf.height())
-		throw runtime_error("attempt to draw outside the buffer");
-
-	ASSERT((x & 1) == 0);
-
 	uint8_t *p = (uint8_t*)(buf.map(0) + buf.stride(0) * y + x * 2);
 
 	uint8_t y0 = yuv1.y;
@@ -163,6 +159,62 @@ void draw_yuv422_macropixel(IFramebuffer& buf, unsigned x, unsigned y, YUV yuv1,
 	}
 }
 
+static void draw_yuv422_semiplanar_macropixel(IFramebuffer& buf, unsigned x, unsigned y,
+					      YUV yuv1, YUV yuv2)
+{
+	uint8_t *py = (uint8_t*)(buf.map(0) + buf.stride(0) * y + x);
+	uint8_t *puv = (uint8_t*)(buf.map(1) + buf.stride(1) * y + x);
+
+	uint8_t y0 = yuv1.y;
+	uint8_t y1 = yuv2.y;
+	uint8_t u = (yuv1.u + yuv2.u) / 2;
+	uint8_t v = (yuv1.v + yuv2.v) / 2;
+
+	switch (buf.format()) {
+	case PixelFormat::NV16:
+		py[0] = y0;
+		py[1] = y1;
+		puv[0] = u;
+		puv[1] = v;
+		break;
+
+	case PixelFormat::NV61:
+		py[0] = y0;
+		py[1] = y1;
+		puv[0] = v;
+		puv[1] = u;
+		break;
+
+	default:
+		throw std::invalid_argument("invalid pixelformat");
+	}
+}
+
+void draw_yuv422_macropixel(IFramebuffer& buf, unsigned x, unsigned y, YUV yuv1, YUV yuv2)
+{
+	if ((x + 1) >= buf.width() || y >= buf.height())
+		throw runtime_error("attempt to draw outside the buffer");
+
+	ASSERT((x & 1) == 0);
+
+	switch (buf.format()) {
+	case PixelFormat::UYVY:
+	case PixelFormat::YUYV:
+	case PixelFormat::YVYU:
+	case PixelFormat::VYUY:
+		draw_yuv422_packed_macropixel(buf, x, y, yuv1, yuv2);
+		break;
+
+	case PixelFormat::NV16:
+	case PixelFormat::NV61:
+		draw_yuv422_semiplanar_macropixel(buf, x, y, yuv1, yuv2);
+		break;
+
+	default:
+		throw std::invalid_argument("invalid pixelformat");
+	}
+}
+
 void draw_yuv420_macropixel(IFramebuffer& buf, unsigned x, unsigned y,
 			    YUV yuv1, YUV yuv2, YUV yuv3, YUV yuv4)
 {
@@ -235,6 +287,8 @@ void draw_rect(IFramebuffer &fb, uint32_t x, uint32_t y, uint32_t w, uint32_t h,
 	case PixelFormat::YUYV:
 	case PixelFormat::YVYU:
 	case PixelFormat::VYUY:
+	case PixelFormat::NV16:
+	case PixelFormat::NV61:
 		for (j = 0; j < h; j++) {
 			for (i = 0; i < w; i += 2) {
 				draw_yuv422_macropixel(fb, x + i, y + j, yuvcolor, yuvcolor);
@@ -311,6 +365,8 @@ static void draw_char(IFramebuffer& buf, uint32_t xpos, uint32_t ypos, char c, R
 	case PixelFormat::YUYV:
 	case PixelFormat::YVYU:
 	case PixelFormat::VYUY:
+	case PixelFormat::NV16:
+	case PixelFormat::NV61:
 		for (y = 0; y < 8; y++) {
 			for (x = 0; x < 8; x += 2) {
 				bool b0 = get_char_pixel(c, x, y);
diff --git a/kms++util/src/testpat.cpp b/kms++util/src/testpat.cpp
index f9a3c8a..c120de3 100644
--- a/kms++util/src/testpat.cpp
+++ b/kms++util/src/testpat.cpp
@@ -106,6 +106,7 @@ static void draw_test_pattern_part(IFramebuffer& fb, unsigned start_y, unsigned
 	unsigned w = fb.width();
 
 	const PixelFormatInfo& format_info = get_pixel_format_info(fb.format());
+	const PixelFormatPlaneInfo& plane_info = format_info.planes[format_info.num_planes - 1];
 
 	switch (format_info.type) {
 	case PixelColorType::RGB:
@@ -118,8 +119,8 @@ static void draw_test_pattern_part(IFramebuffer& fb, unsigned start_y, unsigned
 		break;
 
 	case PixelColorType::YUV:
-		switch (format_info.num_planes) {
-		case 1:
+		switch (plane_info.xsub + plane_info.ysub) {
+		case 3:
 			for (y = start_y; y < end_y; y++) {
 				for (x = 0; x < w; x += 2) {
 					RGB pixel1 = get_test_pattern_pixel(fb, x, y);
@@ -129,7 +130,7 @@ static void draw_test_pattern_part(IFramebuffer& fb, unsigned start_y, unsigned
 			}
 			break;
 
-		case 2:
+		case 4:
 			for (y = start_y; y < end_y; y += 2) {
 				for (x = 0; x < w; x += 2) {
 					RGB pixel00 = get_test_pattern_pixel(fb, x, y);