renderer: revamped engine interfaces

Introduced updated pre/post calls
for proper preparation of the drawing process.

src/renderer/gl_engine/tvgGlRenderer.cpp

@@ -1233,6 +1233,18 @@ bool GlRenderer::viewport(const RenderRegion& vp)
 }
 
 
+bool GlRenderer::preUpdate()
+{
+    return true;
+}
+
+
+bool GlRenderer::postUpdate()
+{
+    return true;
+}
+
+
 int GlRenderer::init(uint32_t threads)
 {
     if ((initEngineCnt++) > 0) return true;

src/renderer/gl_engine/tvgGlRenderer.h

@@ -63,8 +63,10 @@ public:
         RT_None,
     };
 
+    bool preUpdate() override;
     RenderData prepare(const RenderShape& rshape, RenderData data, const Matrix& transform, Array<RenderData>& clips, uint8_t opacity, RenderUpdateFlag flags, bool clipper) override;
     RenderData prepare(RenderSurface* surface, RenderData data, const Matrix& transform, Array<RenderData>& clips, uint8_t opacity, RenderUpdateFlag flags) override;
+    bool postUpdate() override;
     bool preRender() override;
     bool renderShape(RenderData data) override;
     bool renderImage(RenderData data) override;

src/renderer/sw_engine/tvgSwRenderer.cpp

@@ -363,6 +363,18 @@ bool SwRenderer::target(pixel_t* data, uint32_t stride, uint32_t w, uint32_t h,
 }
 
 
+bool SwRenderer::preUpdate()
+{
+    return true;
+}
+
+
+bool SwRenderer::postUpdate()
+{
+    return true;
+}
+
+
 bool SwRenderer::preRender()
 {
     return true;

src/renderer/sw_engine/tvgSwRenderer.h

@@ -36,8 +36,10 @@ namespace tvg
 class SwRenderer : public RenderMethod
 {
 public:
+    bool preUpdate() override;
     RenderData prepare(const RenderShape& rshape, RenderData data, const Matrix& transform, Array<RenderData>& clips, uint8_t opacity, RenderUpdateFlag flags, bool clipper) override;
     RenderData prepare(RenderSurface* surface, RenderData data, const Matrix& transform, Array<RenderData>& clips, uint8_t opacity, RenderUpdateFlag flags) override;
+    bool postUpdate() override;
     bool preRender() override;
     bool renderShape(RenderData data) override;
     bool renderImage(RenderData data) override;

src/renderer/tvgCanvas.h

@@ -76,9 +76,13 @@ struct Canvas::Impl
 
         auto m = Matrix{1, 0, 0, 0, 1, 0, 0, 0, 1};
 
+        if (!renderer->preUpdate()) return Result::InsufficientCondition;
+
         if (paint) PAINT(paint)->update(renderer, m, clips, 255, flag);
         else PAINT(scene)->update(renderer, m, clips, 255, flag);
 
+        if (!renderer->postUpdate()) return Result::InsufficientCondition;
+
         status = Status::Updating;
         return Result::Success;
     }

src/renderer/tvgRender.h

@@ -383,8 +383,10 @@ public:
     uint32_t unref();
 
     virtual ~RenderMethod() {}
+    virtual bool preUpdate() = 0;
     virtual RenderData prepare(const RenderShape& rshape, RenderData data, const Matrix& transform, Array<RenderData>& clips, uint8_t opacity, RenderUpdateFlag flags, bool clipper) = 0;
     virtual RenderData prepare(RenderSurface* surface, RenderData data, const Matrix& transform, Array<RenderData>& clips, uint8_t opacity, RenderUpdateFlag flags) = 0;
+    virtual bool postUpdate() = 0;
     virtual bool preRender() = 0;
     virtual bool renderShape(RenderData data) = 0;
     virtual bool renderImage(RenderData data) = 0;

src/renderer/wg_engine/tvgWgRenderer.cpp

@@ -480,6 +480,18 @@ bool WgRenderer::effect(TVG_UNUSED RenderCompositor* cmp, TVG_UNUSED const Rende
 }
 
 
+bool WgRenderer::preUpdate()
+{
+    return true;
+}
+
+
+bool WgRenderer::postUpdate()
+{
+    return true;
+}
+
+
 WgRenderer* WgRenderer::gen()
 {
     return new WgRenderer();

src/renderer/wg_engine/tvgWgRenderer.h

@@ -28,8 +28,10 @@
 class WgRenderer : public RenderMethod
 {
 public:
+    bool preUpdate() override;
     RenderData prepare(const RenderShape& rshape, RenderData data, const Matrix& transform, Array<RenderData>& clips, uint8_t opacity, RenderUpdateFlag flags, bool clipper) override;
     RenderData prepare(RenderSurface* surface, RenderData data, const Matrix& transform, Array<RenderData>& clips, uint8_t opacity, RenderUpdateFlag flags) override;
+    bool postUpdate() override;
     bool preRender() override;
     bool renderShape(RenderData data) override;
     bool renderImage(RenderData data) override;