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plugins/backgroundcontrast: Correct texture transform

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The y axis should be mirrored as the last step, otherwise it's going to
change the winding order in rotation transforms in the render target
transform.

BUG: 479934
This commit is contained in:
Vlad Zahorodnii 2024-02-07 10:12:03 +02:00
parent f75fb70ddc
commit 6d0f1fedc0
1 changed files with 2 additions and 2 deletions
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4
src/plugins/backgroundcontrast/contrast.cpp
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@ -474,13 +474,13 @@ void ContrastEffect::doContrast(const RenderTarget &renderTarget, const RenderVi
// to texture coordinates.
const QRectF boundingRect = actualShape.boundingRect();
QMatrix4x4 textureMatrix;
textureMatrix.scale(1, -1);
textureMatrix.translate(0, -1);
// apply texture->buffer transformation
textureMatrix.translate(0.5, 0.5);
textureMatrix *= renderTarget.transform().toMatrix();
textureMatrix.translate(-0.5, -0.5);
// scaled logical to texture coordinates
textureMatrix.scale(1, -1);
textureMatrix.translate(0, -1);
textureMatrix.scale(1.0 / boundingRect.width(), 1.0 / boundingRect.height(), 1);
textureMatrix.translate(-boundingRect.x(), -boundingRect.y(), 0);
textureMatrix.scale(1.0 / viewport.scale(), 1.0 / viewport.scale());