SkMatrix toSkMatrix(const Float32List& matrix4, ExceptionState& es)
{
ASSERT(matrix4.data());
SkMatrix sk_matrix;
if (matrix4.num_elements() != 16) {
es.ThrowTypeError("Incorrect number of elements in matrix.");
return sk_matrix;
}
for (intptr_t i = 0; i < 9; ++i)
sk_matrix[i] = matrix4[kSkMatrixIndexToMatrix4Index[i]];
return sk_matrix;
}
void Canvas::concat(const Float32List& matrix4)
{
if (!m_canvas)
return;
ASSERT(matrix4.data());
// TODO(mpcomplete): how can we raise an error in this case?
if (matrix4.num_elements() != 16)
return;
SkMatrix sk_matrix;
// Mappings from SkMatrix-index to input-index.
static const int kMappings[] = {
0, 4, 12,
1, 5, 13,
3, 7, 15,
};
for (intptr_t i = 0; i < 9; ++i)
sk_matrix[i] = matrix4.data()[kMappings[i]];
m_canvas->concat(sk_matrix);
}
