Added Surface type - as a simple value type to hold a 2d collection of pixels. (#548)

Added PngSerializeUtil allows currently for just writing Surface of RGBA format.
Removes dependency on stbi_image except for in PngSerializeUtil.
Removed use of gWindowWidth/Height globals - pass the height into initialize or Renderer.

1 files changed, 38 insertions, 0 deletions

diff --git a/tools/render-test/png-serialize-util.cpp b/tools/render-test/png-serialize-util.cpp
new file mode 100644
index 000000000..a7f6aa83a
--- /dev/null
+++ b/tools/render-test/png-serialize-util.cpp
@@ -0,0 +1,38 @@
+// png-serialize-util.cpp
+#define _CRT_SECURE_NO_WARNINGS
+
+#include "png-serialize-util.h"
+
+#include <stdlib.h>
+#include <stdio.h>
+
+#define STB_IMAGE_WRITE_IMPLEMENTATION
+#include "external/stb/stb_image_write.h"
+
+namespace renderer_test {
+using namespace Slang;
+
+/* static */Slang::Result PngSerializeUtil::write(const char* filename, const Surface& surface)
+{
+    int numComps = 0;
+    switch (surface.m_format)
+    {
+        case Format::RGBA_Unorm_UInt8:
+        {
+            numComps = 4;
+            break;
+        }
+        default: break;
+    }
+
+    if (numComps <= 0)
+    {
+        return SLANG_FAIL;
+    }
+
+    int stbResult = stbi_write_png(filename, surface.m_width, surface.m_height, numComps, surface.m_data, surface.m_rowStrideInBytes);
+
+    return stbResult ? SLANG_OK : SLANG_FAIL;
+}
+
+} // renderer_test