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capi examples: Added scene API C bindings.

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Scene CAPI allows to use scene functionaliy in C applications such as
set opacity to few shapes at one time or implement transparent layers.

@API Additions:
```c
Tvg_Paint* tvg_scene_new();
Tvg_Result tvg_scene_reserve(Tvg_Paint* scene, uint32_t size);
Tvg_Result tvg_scene_push(Tvg_Paint* scene, Tvg_Paint *paint);
```

Examples:
```c
Tvg_Paint *scene = tvg_scene_new();

Tvg_Paint *shape1 = tvg_shape_new();
tvg_shape_append_rect(shape1, 10, 10, 100, 100, 0, 0);
tvg_shape_set_fill_color(shape1, 255, 0, 0, 255);

Tvg_Paint *shape2 = tvg_shape_new();
tvg_shape_append_rect(shape2, 120, 10, 100, 100, 0, 0);
tvg_shape_set_fill_color(shape2, 255, 0, 0, 255);

tvg_scene_push(scene, shape1);
tvg_scene_push(scene, shape2);

tvg_paint_set_opacity(scene, 100);

tvg_canvas_push(canvas, scene);
```

Co-authored-by: Michal Szczecinski <m.szczecinsk@partner.samsung.com>
This commit is contained in:
Michal Szczecinski 2020-11-10 04:13:48 +01:00 • committed by GitHub
parent 3fabd604bf
commit d1d54e8b8f
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GPG key ID: 4AEE18F83AFDEB23
3 changed files with 41 additions and 1 deletions
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9
inc/thorvg_capi.h
View file

@ -170,7 +170,6 @@ TVG_EXPORT Tvg_Result tvg_gradient_set_spread(Tvg_Gradient* grad, const Tvg_Stro
TVG_EXPORT Tvg_Result tvg_gradient_get_spread(Tvg_Gradient* grad, Tvg_Stroke_Fill* spread);
TVG_EXPORT Tvg_Result tvg_gradient_del(Tvg_Gradient* grad);
/************************************************************************/
/* Picture API */
/************************************************************************/
@ -178,6 +177,14 @@ TVG_EXPORT Tvg_Paint* tvg_picture_new();
TVG_EXPORT Tvg_Result tvg_picture_load(Tvg_Paint* paint, const char* path);
TVG_EXPORT Tvg_Result tvg_picture_get_viewbox(const Tvg_Paint* paint, float* x, float* y, float* w, float* h);
/************************************************************************/
/* Scene API */
/************************************************************************/
TVG_EXPORT Tvg_Paint* tvg_scene_new();
TVG_EXPORT Tvg_Result tvg_scene_reserve(Tvg_Paint* scene, uint32_t size);
TVG_EXPORT Tvg_Result tvg_scene_push(Tvg_Paint* scene, Tvg_Paint* paint);
#ifdef __cplusplus
}
#endif

17
src/bindings/capi/tvgCapi.cpp
View file

@ -475,6 +475,23 @@ TVG_EXPORT Tvg_Result tvg_gradient_get_spread(Tvg_Gradient* grad, Tvg_Stroke_Fil
return TVG_RESULT_SUCCESS;
}
TVG_EXPORT Tvg_Paint* tvg_scene_new()
{
return (Tvg_Paint*) Scene::gen().release();
}
TVG_EXPORT Tvg_Result tvg_scene_reserve(Tvg_Paint* scene, uint32_t size)
{
if (!scene) return TVG_RESULT_INVALID_ARGUMENT;
return (Tvg_Result) reinterpret_cast<Scene*>(scene)->reserve(size);
}
TVG_EXPORT Tvg_Result tvg_scene_push(Tvg_Paint* scene, Tvg_Paint* paint)
{
if (!scene || !paint) return TVG_RESULT_INVALID_ARGUMENT;
return (Tvg_Result) reinterpret_cast<Scene*>(scene)->push(unique_ptr<Paint>((Paint*)paint));
}
#ifdef __cplusplus
}

16
src/examples/Capi.cpp
View file

@ -150,6 +150,22 @@ void testCapi()
Tvg_Paint* dup = tvg_paint_duplicate(org);
tvg_canvas_push(canvas, dup);
//Scene test
Tvg_Paint* scene = tvg_scene_new();
Tvg_Paint* scene_shape_1 = tvg_shape_new();
tvg_shape_append_rect(scene_shape_1, 650, 410, 100, 50, 10, 10);
tvg_shape_set_fill_color(scene_shape_1, 0, 255, 0, 255);
Tvg_Paint* scene_shape_2 = tvg_shape_new();
tvg_shape_append_rect(scene_shape_2, 650, 470, 100, 50, 10, 10);
tvg_shape_set_fill_color(scene_shape_2, 0, 255, 0, 255);
tvg_scene_push(scene, scene_shape_1);
tvg_scene_push(scene, scene_shape_2);
tvg_paint_set_opacity(scene, 100);
tvg_canvas_push(canvas, scene);
tvg_canvas_draw(canvas);
tvg_canvas_sync(canvas);