libkwineffects: use std::unique_ptr in GLTexture

The implicit internal sharing stuff wasn't used in KWin, and the way the
d pointer was initialized was horrible

src/backends/x11/standalone/x11_standalone_egl_backend.cpp

@@ -418,7 +418,7 @@ void EglSurfaceTextureX11::update(const QRegion &region)
 }
 
 EglPixmapTexture::EglPixmapTexture(EglBackend *backend)
-    : GLTexture(*new EglPixmapTexturePrivate(this, backend))
+    : GLTexture(std::make_unique<EglPixmapTexturePrivate>(this, backend))
 {
 }
 

src/backends/x11/standalone/x11_standalone_glx_backend.cpp

@@ -871,7 +871,7 @@ void GlxSurfaceTextureX11::update(const QRegion &region)
 }
 
 GlxPixmapTexture::GlxPixmapTexture(GlxBackend *backend)
-    : GLTexture(*new GlxPixmapTexturePrivate(this, backend))
+    : GLTexture(std::make_unique<GlxPixmapTexturePrivate>(this, backend))
 {
 }
 

src/libkwineffects/kwingltexture.cpp

@@ -89,13 +89,8 @@ GLTexture::GLTexture(GLenum target)
     d->m_target = target;
 }
 
-GLTexture::GLTexture(GLTexturePrivate &dd)
-    : d_ptr(&dd)
-{
-}
-
-GLTexture::GLTexture(const GLTexture &tex)
-    : d_ptr(tex.d_ptr)
+GLTexture::GLTexture(std::unique_ptr<GLTexturePrivate> &&dd)
+    : d_ptr(std::move(dd))
 {
 }
 
@@ -271,12 +266,6 @@ bool GLTexture::create()
     return d->m_texture != GL_NONE;
 }
 
-GLTexture &GLTexture::operator=(const GLTexture &tex)
-{
-    d_ptr = tex.d_ptr;
-    return *this;
-}
-
 GLTexturePrivate::GLTexturePrivate()
     : m_texture(0)
     , m_target(0)
@@ -437,11 +426,6 @@ void GLTexture::update(const QImage &image, const QPoint &offset, const QRect &s
     }
 }
 
-void GLTexture::discard()
-{
-    d_ptr = new GLTexturePrivate();
-}
-
 void GLTexture::bind()
 {
     Q_D(GLTexture);

src/libkwineffects/kwingltexture.h

@@ -49,7 +49,6 @@ class KWINGLUTILS_EXPORT GLTexture
 {
 public:
     explicit GLTexture(GLenum target);
-    GLTexture(const GLTexture &tex);
     explicit GLTexture(const QImage &image, GLenum target = GL_TEXTURE_2D);
     explicit GLTexture(const QPixmap &pixmap, GLenum target = GL_TEXTURE_2D);
     explicit GLTexture(const QString &fileName);
@@ -71,8 +70,6 @@ public:
     explicit GLTexture(GLuint textureId, GLenum internalFormat, const QSize &size, int levels = 1);
     virtual ~GLTexture();
 
-    GLTexture &operator=(const GLTexture &tex);
-
     bool isNull() const;
     QSize size() const;
     void setSize(const QSize &size);
@@ -114,7 +111,6 @@ public:
     QMatrix4x4 matrix(TextureCoordinateType type) const;
 
     void update(const QImage &image, const QPoint &offset = QPoint(0, 0), const QRect &src = QRect());
-    virtual void discard();
     void bind();
     void unbind();
     void render(const QSizeF &size, double scale);
@@ -163,8 +159,8 @@ public:
     static bool supportsFormatRG();
 
 protected:
-    QExplicitlySharedDataPointer<GLTexturePrivate> d_ptr;
-    GLTexture(GLTexturePrivate &dd);
+    const std::unique_ptr<GLTexturePrivate> d_ptr;
+    GLTexture(std::unique_ptr<GLTexturePrivate> &&dd);
 
 private:
     Q_DECLARE_PRIVATE(GLTexture)

src/plugins/backgroundcontrast/contrast.cpp

@@ -466,7 +466,6 @@ void ContrastEffect::doContrast(const RenderTarget &renderTarget, const RenderVi
     vbo->draw(GL_TRIANGLES, 0, actualShape.rectCount() * 6);
 
     scratch.unbind();
-    scratch.discard();
 
     vbo->unbindArrays();