Add some unit tests for pixel conversions

meson.build

@@ -147,6 +147,10 @@ if get_option('benchmarks')
 	subdir('bench')
 endif
 
+if get_option('tests')
+	subdir('test')
+endif
+
 install_headers('include/neatvnc.h')
 
 pkgconfig = import('pkgconfig')

meson_options.txt

@@ -1,5 +1,6 @@
 option('benchmarks', type: 'boolean', value: false, description: 'Build benchmarks')
 option('examples', type: 'boolean', value: false, description: 'Build examples')
+option('tests', type: 'boolean', value: false, description: 'Build unit tests')
 option('jpeg', type: 'feature', value: 'auto', description: 'Enable JPEG compression')
 option('tls', type: 'feature', value: 'auto', description: 'Enable encryption & authentication')
 option('systemtap', type: 'boolean', value: false, description: 'Enable tracing using sdt')

test/meson.build

@@ -0,0 +1,11 @@
+pixels = executable('pixels',
+	[
+		'test-pixels.c',
+		'../src/pixels.c',
+	],
+	include_directories: inc,
+	dependencies: [
+		pixman,
+	],
+)
+test('pixels', pixels)

test/test-pixels.c

@@ -0,0 +1,101 @@
+#include "pixels.h"
+
+#include <stdio.h>
+#include <stdint.h>
+#include <stdbool.h>
+#include <string.h>
+#include <libdrm/drm_fourcc.h>
+
+#define swap32(x) (((x >> 24) & 0xff) | ((x << 8) & 0xff0000) | \
+		((x >> 8) & 0xff00) | ((x << 24) & 0xff000000))
+
+#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
+#define u32_le(x) x
+#else
+#define u32_le(x) swap32(x)
+#endif
+
+#define XSTR(s) STR(s)
+#define STR(s) #s
+
+#define UDIV_UP(a, b) (((a) + (b) - 1) / (b))
+#define ARRAY_LEN(a) (sizeof(a) / (sizeof(a[0])))
+
+static bool test_fourcc_to_pixman_fmt(void)
+{
+	pixman_format_code_t r;
+
+#define check(a, b) \
+	r = 0; \
+	if (!fourcc_to_pixman_fmt(&r, b) || a != r) { \
+		fprintf(stderr, "Failed check for %s\n", XSTR(a)); \
+		return false; \
+	} while(0)
+
+#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
+	check(PIXMAN_a2r10g10b10, DRM_FORMAT_ARGB2101010);
+	check(PIXMAN_r8g8b8a8, DRM_FORMAT_RGBA8888);
+	check(PIXMAN_b8g8r8a8, DRM_FORMAT_BGRA8888);
+	check(PIXMAN_r5g6b5, DRM_FORMAT_RGB565);
+#else
+	check(PIXMAN_r8g8b8a8, DRM_FORMAT_ABGR8888);
+	check(PIXMAN_b8g8r8a8, DRM_FORMAT_ARGB8888);
+	check(PIXMAN_r5g6b5, DRM_FORMAT_BGR565);
+#endif
+
+#undef check
+	return true;
+}
+
+static bool test_extract_alpha_mask_rgba8888(void)
+{
+	uint32_t test_data[] = {
+		u32_le(0x00000000), // Black, transparent
+		u32_le(0xff000000), // Red, transparent
+		u32_le(0x00ff0000), // Red, transparent
+		u32_le(0x0000ff00), // Green, transparent
+		u32_le(0x000000ff), // Black, opaque
+		u32_le(0xff0000ff), // Red, opaque
+		u32_le(0x00ff00ff), // Red, opaque
+		u32_le(0x0000ffff), // Green, opaque
+	};
+
+	uint8_t mask[UDIV_UP(ARRAY_LEN(test_data), 8)] = { 0 };
+
+	bool ok = extract_alpha_mask(mask, test_data, DRM_FORMAT_RGBA8888,
+			ARRAY_LEN(test_data));
+	if (!ok) {
+		fprintf(stderr, "Failed to extract alpha mask");
+		return false;
+	}
+
+	if (mask[0] != 0x0f) {
+		fprintf(stderr, "Expected alpha mask to be 0b00001111 (0x0f), but it was %x",
+				mask[0]);
+		return false;
+	}
+
+	memset(mask, 0, sizeof(mask));
+
+	ok = extract_alpha_mask(mask, test_data, DRM_FORMAT_BGRA8888,
+			ARRAY_LEN(test_data));
+	if (!ok) {
+		fprintf(stderr, "Failed to extract alpha mask");
+		return false;
+	}
+
+	if (mask[0] != 0x0f) {
+		fprintf(stderr, "Expected alpha mask to be 0b00001111 (0x0f), but it was %x",
+				mask[0]);
+		return false;
+	}
+
+	return true;
+}
+
+int main()
+{
+	bool ok = test_fourcc_to_pixman_fmt() &&
+		test_extract_alpha_mask_rgba8888();
+	return ok ? 0 : 1;
+}