backends/drm: transform damage to match the framebuffer

Otherwise, the repainted region can be completely wrong, which breaks damage tracking very badly

BUG: 494837

src/backends/drm/drm_egl_layer_surface.cpp

@@ -250,8 +250,10 @@ bool EglGbmLayerSurface::endRendering(const QRegion &damagedRegion, OutputFrame
         if (logicalRepaint == infiniteRegion()) {
             repaint = QRect(QPoint(), m_surface->gbmSwapchain->size());
         } else {
+            const auto mapping = m_surface->currentShadowSlot->framebuffer()->colorAttachment()->contentTransform().combine(OutputTransform::FlipY);
+            const QSize rotatedSize = mapping.map(m_surface->gbmSwapchain->size());
             for (const QRect rect : logicalRepaint) {
-                repaint |= scaledRect(rect, m_surface->scale).toAlignedRect() & QRect(QPoint(), m_surface->gbmSwapchain->size());
+                repaint |= mapping.map(scaledRect(rect, m_surface->scale), rotatedSize).toAlignedRect() & QRect(QPoint(), m_surface->gbmSwapchain->size());
             }
         }
 
@@ -270,8 +272,6 @@ bool EglGbmLayerSurface::endRendering(const QRegion &damagedRegion, OutputFrame
         }
         QMatrix4x4 mat;
         mat.scale(1, -1);
-        mat *= fbo->colorAttachment()->contentTransform().toMatrix();
-        mat.scale(1, -1);
         mat.ortho(QRectF(QPointF(), fbo->size()));
         binder.shader()->setUniform(GLShader::Mat4Uniform::ModelViewProjectionMatrix, mat);
         glDisable(GL_BLEND);
@@ -672,8 +672,10 @@ std::shared_ptr<DrmFramebuffer> EglGbmLayerSurface::importWithEgl(Surface *surfa
     if (damagedRegion == infiniteRegion()) {
         deviceDamage = QRect(QPoint(), surface->gbmSwapchain->size());
     } else {
-        for (const QRect &logical : damagedRegion) {
-            deviceDamage |= scaledRect(logical, surface->scale).toAlignedRect();
+        const auto mapping = surface->currentSlot->framebuffer()->colorAttachment()->contentTransform().combine(OutputTransform::FlipY);
+        const QSize rotatedSize = mapping.map(surface->gbmSwapchain->size());
+        for (const QRect rect : damagedRegion) {
+            deviceDamage |= mapping.map(scaledRect(rect, surface->scale), rotatedSize).toAlignedRect() & QRect(QPoint(), surface->gbmSwapchain->size());
         }
     }
     const QRegion repaint = (deviceDamage | surface->importDamageJournal.accumulate(slot->age(), infiniteRegion())) & QRect(QPoint(), surface->gbmSwapchain->size());