bindings/capi: Check invalid parameters in capi.

Added checks to capi bindings to avoid crash when api is used
with invalid parameters.

src/bindings/capi/tvgCapi.cpp

@@ -83,6 +83,7 @@ TVG_EXPORT Tvg_Canvas* tvg_swcanvas_create()
 
 TVG_EXPORT Tvg_Result tvg_canvas_destroy(Tvg_Canvas* canvas)
 {
+    if (!canvas) return TVG_RESULT_INVALID_ARGUMENT;
     delete(reinterpret_cast<SwCanvas*>(canvas));
     return TVG_RESULT_SUCCESS;
 }
@@ -90,48 +91,56 @@ TVG_EXPORT Tvg_Result tvg_canvas_destroy(Tvg_Canvas* canvas)
 
 TVG_EXPORT Tvg_Result tvg_swcanvas_set_target(Tvg_Canvas* canvas, uint32_t* buffer, uint32_t stride, uint32_t w, uint32_t h, uint32_t cs)
 {
+    if (!canvas) return TVG_RESULT_INVALID_ARGUMENT;
     return (Tvg_Result) reinterpret_cast<SwCanvas*>(canvas)->target(buffer, stride, w, h, static_cast<SwCanvas::Colorspace>(cs));
 }
 
 
 TVG_EXPORT Tvg_Result tvg_canvas_push(Tvg_Canvas* canvas, Tvg_Paint* paint)
 {
+    if (!canvas || !paint) return TVG_RESULT_INVALID_ARGUMENT;
     return (Tvg_Result) reinterpret_cast<Canvas*>(canvas)->push(unique_ptr<Paint>((Paint*)paint));
 }
 
 
 TVG_EXPORT Tvg_Result tvg_canvas_reserve(Tvg_Canvas* canvas, uint32_t n)
 {
+    if (!canvas) return TVG_RESULT_INVALID_ARGUMENT;
     return (Tvg_Result) reinterpret_cast<Canvas*>(canvas)->reserve(n);
 }
 
 
 TVG_EXPORT Tvg_Result tvg_canvas_clear(Tvg_Canvas* canvas)
 {
+    if (!canvas) return TVG_RESULT_INVALID_ARGUMENT;
     return (Tvg_Result) reinterpret_cast<Canvas*>(canvas)->clear();
 }
 
 
 TVG_EXPORT Tvg_Result tvg_canvas_update(Tvg_Canvas* canvas)
 {
-     return (Tvg_Result) reinterpret_cast<Canvas*>(canvas)->update(nullptr);
+    if (!canvas) return TVG_RESULT_INVALID_ARGUMENT;
+    return (Tvg_Result) reinterpret_cast<Canvas*>(canvas)->update(nullptr);
 }
 
 
 TVG_EXPORT Tvg_Result tvg_canvas_update_paint(Tvg_Canvas* canvas, Tvg_Paint* paint)
 {
+    if (!canvas || !paint) return TVG_RESULT_INVALID_ARGUMENT;
     return (Tvg_Result) reinterpret_cast<Canvas*>(canvas)->update((Paint*) paint);
 }
 
 
 TVG_EXPORT Tvg_Result tvg_canvas_draw(Tvg_Canvas* canvas)
 {
+    if (!canvas) return TVG_RESULT_INVALID_ARGUMENT;
     return (Tvg_Result) reinterpret_cast<Canvas*>(canvas)->draw();
 }
 
 
 TVG_EXPORT Tvg_Result tvg_canvas_sync(Tvg_Canvas* canvas)
 {
+    if (!canvas) return TVG_RESULT_INVALID_ARGUMENT;
     return (Tvg_Result) reinterpret_cast<Canvas*>(canvas)->sync();
 }
 
@@ -142,6 +151,7 @@ TVG_EXPORT Tvg_Result tvg_canvas_sync(Tvg_Canvas* canvas)
 
 TVG_EXPORT Tvg_Result tvg_paint_del(Tvg_Paint* paint)
 {
+    if (!paint) return TVG_RESULT_INVALID_ARGUMENT;
     delete(paint);
     return TVG_RESULT_SUCCESS;
 }
@@ -149,24 +159,28 @@ TVG_EXPORT Tvg_Result tvg_paint_del(Tvg_Paint* paint)
 
 TVG_EXPORT Tvg_Result tvg_paint_scale(Tvg_Paint* paint, float factor)
 {
+    if (!paint) return TVG_RESULT_INVALID_ARGUMENT;
     return (Tvg_Result) reinterpret_cast<Paint*>(paint)->scale(factor);
 }
 
 
 TVG_EXPORT Tvg_Result tvg_paint_rotate(Tvg_Paint* paint, float degree)
 {
+    if (!paint) return TVG_RESULT_INVALID_ARGUMENT;
     return (Tvg_Result) reinterpret_cast<Paint*>(paint)->rotate(degree);
 }
 
 
 TVG_EXPORT Tvg_Result tvg_paint_translate(Tvg_Paint* paint, float x, float y)
 {
+    if (!paint) return TVG_RESULT_INVALID_ARGUMENT;
     return (Tvg_Result) reinterpret_cast<Paint*>(paint)->translate(x, y);
 }
 
 
 TVG_EXPORT Tvg_Result tvg_paint_transform(Tvg_Paint* paint, const Tvg_Matrix* m)
 {
+    if (!paint) return TVG_RESULT_INVALID_ARGUMENT;
     return (Tvg_Result) reinterpret_cast<Paint*>(paint)->transform(*(reinterpret_cast<const Matrix*>(m)));
 }
 
@@ -183,41 +197,48 @@ TVG_EXPORT Tvg_Paint* tvg_shape_new()
 
 TVG_EXPORT Tvg_Result tvg_shape_reset(Tvg_Paint* paint)
 {
+    if (!paint) return TVG_RESULT_INVALID_ARGUMENT;
     return (Tvg_Result) reinterpret_cast<Shape*>(paint)->reset();
 }
 
 
 TVG_EXPORT Tvg_Result tvg_shape_move_to(Tvg_Paint* paint, float x, float y)
 {
+    if (!paint) return TVG_RESULT_INVALID_ARGUMENT;
     return (Tvg_Result) reinterpret_cast<Shape*>(paint)->moveTo(x, y);
 }
 
 
 TVG_EXPORT Tvg_Result tvg_shape_line_to(Tvg_Paint* paint, float x, float y)
 {
+    if (!paint) return TVG_RESULT_INVALID_ARGUMENT;
     return (Tvg_Result) reinterpret_cast<Shape*>(paint)->lineTo(x, y);
 }
 
 
 TVG_EXPORT Tvg_Result tvg_shape_cubic_to(Tvg_Paint* paint, float cx1, float cy1, float cx2, float cy2, float x, float y)
 {
+    if (!paint) return TVG_RESULT_INVALID_ARGUMENT;
     return (Tvg_Result) reinterpret_cast<Shape*>(paint)->cubicTo(cx1, cy1, cx2, cy2, x, y);
 }
 
 
 TVG_EXPORT Tvg_Result tvg_shape_close(Tvg_Paint* paint)
 {
+    if (!paint) return TVG_RESULT_INVALID_ARGUMENT;
     return (Tvg_Result) reinterpret_cast<Shape*>(paint)->close();
 }
 
 
 TVG_EXPORT Tvg_Result tvg_shape_append_rect(Tvg_Paint* paint, float x, float y, float w, float h, float rx, float ry)
 {
+    if (!paint) return TVG_RESULT_INVALID_ARGUMENT;
     return (Tvg_Result) reinterpret_cast<Shape*>(paint)->appendRect(x, y, w, h, rx, ry);
 }
 
 TVG_EXPORT Tvg_Result tvg_shape_append_arc(Tvg_Paint* paint, float cx, float cy, float radius, float startAngle, float sweep, uint8_t pie)
 {
+    if (!paint) return TVG_RESULT_INVALID_ARGUMENT;
     return (Tvg_Result) reinterpret_cast<Shape*>(paint)->appendArc(cx, cy, radius, startAngle, sweep, pie);
 }
 
@@ -229,54 +250,63 @@ TVG_EXPORT Tvg_Result tvg_shape_append_circle(Tvg_Paint* paint, float cx, float
 
 TVG_EXPORT Tvg_Result tvg_shape_append_path(Tvg_Paint* paint, const Tvg_Path_Command* cmds, uint32_t cmdCnt, const Tvg_Point* pts, uint32_t ptsCnt)
 {
+    if (!paint) return TVG_RESULT_INVALID_ARGUMENT;
     return (Tvg_Result) reinterpret_cast<Shape*>(paint)->appendPath((PathCommand*)cmds, cmdCnt, (Point*)pts, ptsCnt);
 }
 
 
 TVG_EXPORT Tvg_Result tvg_shape_set_stroke_width(Tvg_Paint* paint, float width)
 {
+    if (!paint) return TVG_RESULT_INVALID_ARGUMENT;
     return (Tvg_Result) reinterpret_cast<Shape*>(paint)->stroke(width);
 }
 
 
 TVG_EXPORT Tvg_Result tvg_shape_set_stroke_color(Tvg_Paint* paint, uint8_t r, uint8_t g, uint8_t b, uint8_t a)
 {
+    if (!paint) return TVG_RESULT_INVALID_ARGUMENT;
     return (Tvg_Result) reinterpret_cast<Shape*>(paint)->stroke(r, g, b, a);
 }
 
 
 TVG_EXPORT Tvg_Result tvg_shape_set_stroke_dash(Tvg_Paint* paint, const float* dashPattern, uint32_t cnt)
 {
+    if (!paint) return TVG_RESULT_INVALID_ARGUMENT;
     return (Tvg_Result) reinterpret_cast<Shape*>(paint)->stroke(dashPattern, cnt);
 }
 
 
 TVG_EXPORT Tvg_Result tvg_shape_set_stroke_cap(Tvg_Paint* paint, Tvg_Stroke_Cap cap)
 {
+    if (!paint) return TVG_RESULT_INVALID_ARGUMENT;
     return (Tvg_Result) reinterpret_cast<Shape*>(paint)->stroke((StrokeCap)cap);
 }
 
 
 TVG_EXPORT Tvg_Result tvg_shape_set_stroke_join(Tvg_Paint* paint, Tvg_Stroke_Join join)
 {
+    if (!paint) return TVG_RESULT_INVALID_ARGUMENT;
     return (Tvg_Result) reinterpret_cast<Shape*>(paint)->stroke((StrokeJoin)join);
 }
 
 
 TVG_EXPORT Tvg_Result tvg_shape_fill_color(Tvg_Paint* paint, uint8_t r, uint8_t g, uint8_t b, uint8_t a)
 {
+    if (!paint) return TVG_RESULT_INVALID_ARGUMENT;
     return (Tvg_Result) reinterpret_cast<Shape*>(paint)->fill(r, g, b, a);
 }
 
 
 TVG_EXPORT Tvg_Result tvg_shape_linear_gradient_set(Tvg_Paint* paint, Tvg_Gradient *gradient)
 {
+    if (!paint) return TVG_RESULT_INVALID_ARGUMENT;
     return (Tvg_Result) reinterpret_cast<Shape*>(paint)->fill(unique_ptr<LinearGradient>((LinearGradient*)(gradient)));
 }
 
 
 TVG_EXPORT Tvg_Result tvg_shape_radial_gradient_set(Tvg_Paint* paint, Tvg_Gradient *gradient)
 {
+    if (!paint) return TVG_RESULT_INVALID_ARGUMENT;
     return (Tvg_Result) reinterpret_cast<Shape*>(paint)->fill(unique_ptr<RadialGradient>((RadialGradient*)(gradient)));
 }
 
@@ -293,12 +323,14 @@ TVG_EXPORT Tvg_Paint* tvg_picture_new()
 
 TVG_EXPORT Tvg_Result tvg_picture_load(Tvg_Paint* paint, const char* path)
 {
+    if (!paint) return TVG_RESULT_INVALID_ARGUMENT;
     return (Tvg_Result) reinterpret_cast<Picture*>(paint)->load(path);
 }
 
 
 TVG_EXPORT Tvg_Result tvg_picture_get_viewbox(Tvg_Paint* paint, float* x, float* y, float* w, float* h)
 {
+    if (!paint) return TVG_RESULT_INVALID_ARGUMENT;
     return (Tvg_Result) reinterpret_cast<Picture*>(paint)->viewbox(x, y, w, h);
 }
 
@@ -319,27 +351,32 @@ TVG_EXPORT Tvg_Gradient* tvg_radial_gradient_new()
 
 TVG_EXPORT Tvg_Result tvg_gradient_del(Tvg_Gradient* grad)
 {
+    if (!grad) return TVG_RESULT_INVALID_ARGUMENT;
     delete(grad);
     return TVG_RESULT_SUCCESS;
 }
 
 TVG_EXPORT Tvg_Result tvg_linear_gradient_set(Tvg_Gradient* grad, float x1, float y1, float x2, float y2)
 {
+    if (!grad) return TVG_RESULT_INVALID_ARGUMENT;
     return (Tvg_Result) reinterpret_cast<LinearGradient*>(grad)->linear(x1, y1, x2, y2);
 }
 
 TVG_EXPORT Tvg_Result tvg_radial_gradient_set(Tvg_Gradient* grad, float cx, float cy, float radius)
 {
+    if (!grad) return TVG_RESULT_INVALID_ARGUMENT;
     return (Tvg_Result) reinterpret_cast<RadialGradient*>(grad)->radial(cx, cy, radius);
 }
 
 TVG_EXPORT Tvg_Result tvg_gradient_color_stops(Tvg_Gradient* grad, const Tvg_Color_Stop* color_stop, uint32_t cnt)
 {
+    if (!grad) return TVG_RESULT_INVALID_ARGUMENT;
     return (Tvg_Result) reinterpret_cast<Fill*>(grad)->colorStops(reinterpret_cast<const Fill::ColorStop*>(color_stop), cnt);
 }
 
 TVG_EXPORT Tvg_Result tvg_gradient_spread(Tvg_Gradient* grad, const Tvg_Stroke_Fill spread)
 {
+    if (!grad) return TVG_RESULT_INVALID_ARGUMENT;
     return (Tvg_Result) reinterpret_cast<Fill*>(grad)->spread((FillSpread)spread);
 }