renderer/engines: added mainSurface() interface.

This interface expects the main surface of the raster engine.

src/renderer/gl_engine/tvgGlRenderer.cpp

@@ -191,6 +191,12 @@ ColorSpace GlRenderer::colorSpace()
 }
 
 
+const Surface* GlRenderer::mainSurface()
+{
+    return &surface;
+}
+
+
 bool GlRenderer::blend(TVG_UNUSED BlendMethod method)
 {
     //TODO:

src/renderer/gl_engine/tvgGlRenderer.h

@@ -51,8 +51,6 @@ public:
         RT_None,
     };
 
-    Surface surface;
-
     RenderData prepare(const RenderShape& rshape, RenderData data, const RenderTransform* transform, Array<RenderData>& clips, uint8_t opacity, RenderUpdateFlag flags, bool clipper) override;
     RenderData prepare(const Array<RenderData>& scene, RenderData data, const RenderTransform* transform, Array<RenderData>& clips, uint8_t opacity, RenderUpdateFlag flags) override;
     RenderData prepare(Surface* surface, const RenderMesh* mesh, RenderData data, const RenderTransform* transform, Array<RenderData>& clips, uint8_t opacity, RenderUpdateFlag flags) override;
@@ -66,6 +64,7 @@ public:
     bool viewport(const RenderRegion& vp) override;
     bool blend(BlendMethod method) override;
     ColorSpace colorSpace() override;
+    const Surface* mainSurface() override;
 
     bool target(int32_t id, uint32_t w, uint32_t h);
     bool sync() override;
@@ -93,6 +92,7 @@ private:
     void prepareCmpTask(GlRenderTask* task);
     void endRenderPass(Compositor* cmp);
 
+    Surface surface;
     GLint mTargetFboId = 0;
     RenderRegion mViewport;
     std::unique_ptr<GlStageBuffer> mGpuBuffer;

src/renderer/sw_engine/tvgSwRenderer.cpp

@@ -607,6 +607,12 @@ bool SwRenderer::mempool(bool shared)
 }
 
 
+const Surface* SwRenderer::mainSurface()
+{
+    return surface;
+}
+
+
 Compositor* SwRenderer::target(const RenderRegion& region, ColorSpace cs)
 {
     auto x = region.x;

src/renderer/sw_engine/tvgSwRenderer.h

@@ -49,6 +49,7 @@ public:
     bool viewport(const RenderRegion& vp) override;
     bool blend(BlendMethod method) override;
     ColorSpace colorSpace() override;
+    const Surface* mainSurface() override;
 
     bool clear() override;
     bool sync() override;

src/renderer/tvgRender.h

@@ -293,6 +293,7 @@ public:
     virtual bool viewport(const RenderRegion& vp) = 0;
     virtual bool blend(BlendMethod method) = 0;
     virtual ColorSpace colorSpace() = 0;
+    virtual const Surface* mainSurface() = 0;
 
     virtual bool clear() = 0;
     virtual bool sync() = 0;

src/renderer/wg_engine/tvgWgRenderer.cpp

@@ -254,6 +254,12 @@ ColorSpace WgRenderer::colorSpace()
 }
 
 
+const Surface* WgRenderer::mainSurface()
+{
+    return &mTargetSurface;
+}
+
+
 bool WgRenderer::clear()
 {
     return true;

src/renderer/wg_engine/tvgWgRenderer.h

@@ -46,6 +46,7 @@ public:
     bool viewport(const RenderRegion& vp) override;
     bool blend(BlendMethod method) override;
     ColorSpace colorSpace() override;
+    const Surface* mainSurface() override;
 
     bool clear() override;
     bool sync() override;