Add QQuickWindow::TextureIsOpaque as option to createTextureFromImage.

Opaque textures can be a lot faster, so give this option without
forcing the user to reimplement her/his own QSGTexture class.

The old behavior was that createTextureFromImage() disregarded
TextureHasAlphaChannel and looked solely at the image's format. To
keep this behavior intact, we introduce a second opt-in flag to switch
textures from auto-detect to false, namely TextureIsOpaque.

[ChangeLog][QtQuick][QQuickWindow] Add TextureIsOpaque option to
createTextureFromImage()

Change-Id: I248db4bc5f7920864b6aa8d831ce24d23ad370ef
Reviewed-by: Laszlo Agocs <laszlo.agocs@theqtcompany.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/src/quick/scenegraph/util/qsgatlastexture_p.h b/src/quick/scenegraph/util/qsgatlastexture_p.h
index 399d5fd669..c0f6ab912d 100644
--- a/src/quick/scenegraph/util/qsgatlastexture_p.h
+++ b/src/quick/scenegraph/util/qsgatlastexture_p.h
@@ -58,7 +58,7 @@ public:
     Manager();
     ~Manager();
 
-    QSGTexture *create(const QImage &image);
+    QSGTexture *create(const QImage &image, bool hasAlphaChannel);
     void invalidate();
 
 private:
@@ -114,6 +114,7 @@ public:
 
     int textureId() const { return m_atlas->textureId(); }
     QSize textureSize() const { return atlasSubRectWithoutPadding().size(); }
+    void setHasAlphaChannel(bool alpha) { m_has_alpha = alpha; }
     bool hasAlphaChannel() const { return m_has_alpha; }
     bool hasMipmaps() const { return false; }
     bool isAtlasTexture() const { return true; }