Convert .tgs with go libraries (and cgo) (telegram) (#1569)

This commit adds support for go/cgo tgs conversion when building with the -tags `cgo`
The default binaries are still "pure" go and uses the old way of converting.

* Move lottie_convert.py conversion code to its own file

* Add optional libtgsconverter

* Update vendor

* Apply suggestions from code review

* Update bridge/helper/libtgsconverter.go

Co-authored-by: Wim <wim@42.be>

vendor/github.com/Benau/go_rlottie/rlottiecommon.h

@@ -0,0 +1,231 @@
+/*
+ * Copyright (c) 2020 Samsung Electronics Co., Ltd. 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 _RLOTTIE_COMMON_H_
+#define _RLOTTIE_COMMON_H_
+
+#if defined _WIN32 || defined __CYGWIN__
+  #ifdef RLOTTIE_BUILD
+    #define RLOTTIE_API __declspec(dllexport)
+  #else
+    #define RLOTTIE_API __declspec(dllimport)
+  #endif
+#else
+  #ifdef RLOTTIE_BUILD
+      #define RLOTTIE_API __attribute__ ((visibility ("default")))
+  #else
+      #define RLOTTIE_API
+  #endif
+#endif
+
+
+/**
+ * @defgroup Lottie_Animation Lottie_Animation
+ *
+ * Lottie Animation is a modern style vector based animation design. Its animation
+ * resource(within json format) could be generated by Adobe After Effect using
+ * bodymovin plugin. You can find a good examples in Lottie Community which
+ * shares many free resources(see: www.lottiefiles.com).
+ *
+ * This Lottie_Animation is a common engine to manipulate, control Lottie
+ * Animation from the Lottie resource - json file. It provides a scene-graph
+ * node tree per frames by user demand as well as rasterized frame images.
+ *
+ */
+
+/**
+ * @ingroup Lottie_Animation
+ */
+
+typedef enum
+{
+    BrushSolid = 0,
+    BrushGradient
+} LOTBrushType;
+
+typedef enum
+{
+    FillEvenOdd = 0,
+    FillWinding
+} LOTFillRule;
+
+typedef enum
+{
+    JoinMiter = 0,
+    JoinBevel,
+    JoinRound
+} LOTJoinStyle;
+
+typedef enum
+{
+    CapFlat = 0,
+    CapSquare,
+    CapRound
+} LOTCapStyle;
+
+typedef enum
+{
+    GradientLinear = 0,
+    GradientRadial
+} LOTGradientType;
+
+typedef struct LOTGradientStop
+{
+    float         pos;
+    unsigned char r, g, b, a;
+} LOTGradientStop;
+
+typedef enum
+{
+    MaskAdd = 0,
+    MaskSubstract,
+    MaskIntersect,
+    MaskDifference
+} LOTMaskType;
+
+typedef struct LOTMask {
+    struct {
+        const float *ptPtr;
+        size_t       ptCount;
+        const char*  elmPtr;
+        size_t       elmCount;
+    } mPath;
+    LOTMaskType mMode;
+    unsigned char mAlpha;
+}LOTMask;
+
+typedef enum
+{
+    MatteNone = 0,
+    MatteAlpha,
+    MatteAlphaInv,
+    MatteLuma,
+    MatteLumaInv
+} LOTMatteType;
+
+typedef struct LOTMarker {
+   char *name;
+   size_t startframe;
+   size_t endframe;
+} LOTMarker;
+
+typedef struct LOTMarkerList {
+   LOTMarker *ptr;
+   size_t size;
+} LOTMarkerList;
+
+typedef struct LOTNode {
+
+#define ChangeFlagNone 0x0000
+#define ChangeFlagPath 0x0001
+#define ChangeFlagPaint 0x0010
+#define ChangeFlagAll (ChangeFlagPath & ChangeFlagPaint)
+
+    struct {
+        const float *ptPtr;
+        size_t       ptCount;
+        const char  *elmPtr;
+        size_t       elmCount;
+    } mPath;
+
+    struct {
+        unsigned char r, g, b, a;
+    } mColor;
+
+    struct {
+        unsigned char  enable;
+        float       width;
+        LOTCapStyle  cap;
+        LOTJoinStyle join;
+        float       miterLimit;
+        float    *dashArray;
+        int       dashArraySize;
+    } mStroke;
+
+    struct {
+        LOTGradientType  type;
+        LOTGradientStop *stopPtr;
+        size_t           stopCount;
+        struct {
+            float x, y;
+        } start, end, center, focal;
+        float cradius;
+        float fradius;
+    } mGradient;
+
+    struct {
+        unsigned char *data;
+        size_t width;
+        size_t height;
+        unsigned char mAlpha;
+        struct {
+           float m11; float m12; float m13;
+           float m21; float m22; float m23;
+           float m31; float m32; float m33;
+        } mMatrix;
+    } mImageInfo;
+
+    int       mFlag;
+    LOTBrushType mBrushType;
+    LOTFillRule  mFillRule;
+
+    const char  *keypath;
+} LOTNode;
+
+
+
+typedef struct LOTLayerNode {
+
+    struct {
+        LOTMask        *ptr;
+        size_t          size;
+    } mMaskList;
+
+    struct {
+        const float *ptPtr;
+        size_t       ptCount;
+        const char  *elmPtr;
+        size_t       elmCount;
+    } mClipPath;
+
+    struct {
+        struct LOTLayerNode   **ptr;
+        size_t                  size;
+    } mLayerList;
+
+    struct {
+        LOTNode        **ptr;
+        size_t           size;
+    } mNodeList;
+
+    LOTMatteType mMatte;
+    int          mVisible;
+    unsigned char mAlpha;
+    const char  *keypath;
+
+} LOTLayerNode;
+
+/**
+ * @}
+ */
+
+#endif  // _RLOTTIE_COMMON_H_