Function
Coglgraphene_matrix_transform_points
Declaration [src]
void
cogl_graphene_matrix_transform_points (
  const graphene_matrix_t* matrix,
  int n_components,
  size_t stride_in,
  void* points_in,
  size_t stride_out,
  void* points_out,
  int n_points
)
Description [src]
Transforms an array of input points and writes the result to another array of output points. The input points can either have 2 or 3 components each. The output points always have 3 components. The output array can simply point to the input array to do the transform in-place.
Here’s an example with differing input/output strides:
typedef struct {
  float x,y;
  uint8_t r,g,b,a;
  float s,t,p;
} MyInVertex;
typedef struct {
  uint8_t r,g,b,a;
  float x,y,z;
} MyOutVertex;
MyInVertex vertices[N_VERTICES];
MyOutVertex results[N_VERTICES];
graphene_matrix_t matrix;
my_load_vertices (vertices);
my_get_matrix (&matrix);
cogl_graphene_matrix_transform_points (&matrix,
                              2,
                              sizeof (MyInVertex),
                              &vertices[0].x,
                              sizeof (MyOutVertex),
                              &results[0].x,
                              N_VERTICES);
Parameters
- matrix
- 
            Type: graphene_matrix_tA transformation matrix. The data is owned by the caller of the function. 
- n_components
- 
            Type: intThe number of position components for each input point. (either 2 or 3). 
- stride_in
- 
            Type: size_tThe stride in bytes between input points. 
- points_in
- 
            Type: void*A pointer to the first component of the first input point. The argument can be NULL.The data is owned by the caller of the function. 
- stride_out
- 
            Type: size_tThe stride in bytes between output points. 
- points_out
- 
            Type: void*A pointer to the first component of the first output point. The argument can be NULL.The data is owned by the caller of the function. 
- n_points
- 
            Type: intThe number of points to transform.