aiden/video-shader-toys
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Updated shader and fixed PNG output
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This commit is contained in:
Aiden
2026-05-08 15:52:58 +10:00
parent 05d0bcbedd
commit 0831e18c2d
4 changed files with 69 additions and 22 deletions
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18
apps/LoopThroughWithOpenGLCompositing/gl/PngScreenshotWriter.cpp
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@@ -20,10 +20,10 @@ bool WritePngFile(
const std::filesystem::path& outputPath,
unsigned width,
unsigned height,
const std::vector<unsigned char>& rgbaPixels,
const std::vector<unsigned char>& bgraPixels,
std::string& error)
{
if (width == 0 || height == 0 || rgbaPixels.size() < static_cast<std::size_t>(width) * height * 4)
if (width == 0 || height == 0 || bgraPixels.size() < static_cast<std::size_t>(width) * height * 4)
{
error = "Invalid screenshot dimensions or pixel buffer.";
return false;
@@ -83,19 +83,19 @@ bool WritePngFile(
if (SUCCEEDED(result))
result = frame->SetSize(width, height);
WICPixelFormatGUID pixelFormat = GUID_WICPixelFormat32bppRGBA;
WICPixelFormatGUID pixelFormat = GUID_WICPixelFormat32bppBGRA;
if (SUCCEEDED(result))
result = frame->SetPixelFormat(&pixelFormat);
if (SUCCEEDED(result) && pixelFormat != GUID_WICPixelFormat32bppRGBA)
if (SUCCEEDED(result) && pixelFormat != GUID_WICPixelFormat32bppBGRA)
{
error = "PNG encoder did not accept RGBA pixel format.";
error = "PNG encoder did not accept BGRA pixel format.";
result = E_FAIL;
}
const UINT stride = width * 4;
const UINT imageSize = stride * height;
if (SUCCEEDED(result))
result = frame->WritePixels(height, stride, imageSize, const_cast<BYTE*>(rgbaPixels.data()));
result = frame->WritePixels(height, stride, imageSize, const_cast<BYTE*>(bgraPixels.data()));
if (SUCCEEDED(result))
result = frame->Commit();
if (SUCCEEDED(result))
@@ -107,6 +107,8 @@ bool WritePngFile(
if (FAILED(result))
{
error = "Could not write screenshot PNG: " + HResultToString(result);
std::error_code ignored;
std::filesystem::remove(outputPath, ignored);
return false;
}
@@ -123,6 +125,9 @@ void WritePngFileAsync(
std::thread(
[outputPath, width, height, pixels = std::move(rgbaPixels)]() mutable
{
for (std::size_t index = 0; index + 3 < pixels.size(); index += 4)
std::swap(pixels[index], pixels[index + 2]);
std::string error;
if (!WritePngFile(outputPath, width, height, pixels, error))
OutputDebugStringA(("Screenshot write failed: " + error + "\n").c_str());
@@ -130,4 +135,3 @@ void WritePngFileAsync(
OutputDebugStringA(("Screenshot written: " + outputPath.string() + "\n").c_str());
}).detach();
}