common frame_module: adds FrameModule interface.

This interface is designed for controlling animation frames.

src/lib/meson.build

@@ -14,6 +14,7 @@ source_file = [
    'tvgBezier.h',
    'tvgBinaryDesc.h',
    'tvgFill.h',
+   'tvgFrameModule.h',
    'tvgLoader.h',
    'tvgLoadModule.h',
    'tvgLzw.h',

src/lib/tvgFrameModule.h

@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2023 the ThorVG project. All rights reserved.
+
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#ifndef _TVG_FRAME_MODULE_H_
+#define _TVG_FRAME_MODULE_H_
+
+#include "tvgLoadModule.h"
+
+namespace tvg
+{
+
+class FrameModule: public LoadModule
+{
+public:
+    virtual ~FrameModule() {}
+
+    virtual bool frame(uint32_t frameNo) = 0;   //set the current frame number
+
+    virtual uint32_t totalFrame() = 0;      //return the total frame count
+    virtual uint32_t curFrame() = 0;        //return the current frame number
+    virtual float duration() = 0;           //return the animation duration in seconds
+
+    virtual bool animatable() override { return true; }
+};
+
+}
+
+#endif //_TVG_FRAME_MODULE_H_