[PATCH 4/5] d2d1: Implement initial clipping support.

[Matteo Bruni]

2014-09-05 15:50 GMT+02:00 Henri Verbeet <hverbeet at codeweavers.com>:
> +static BOOL d2d_clip_stack_push(struct d2d_clip_stack *stack, const D2D1_RECT_F *rect)
> +{
> +    if (stack->current == stack->stack_size - 1)
> +    {
> +        D2D1_RECT_F *new_stack;
> +        unsigned int new_size;
> +
> +        if (stack->stack_size > UINT_MAX / 2)
> +            return FALSE;
> +
> +        new_size = stack->stack_size * 2;
> +        if (!(new_stack = HeapReAlloc(GetProcessHeap(), 0, stack->stack, new_size * sizeof(*stack->stack))))
> +            return FALSE;
> +
> +        stack->stack = new_stack;
> +        stack->stack_size = new_size;
> +    }
> +
> +    stack->stack[stack->current++] = *rect;
> +    d2d_rect_intersect(&stack->clip_rect, rect);
> +
> +    return TRUE;
> +}
> +
> +static void d2d_clip_stack_pop(struct d2d_clip_stack *stack, unsigned int w, unsigned int h)
> +{
> +    unsigned int i;
> +
> +    if (!stack->current)
> +        return;
> +
> +    --stack->current;
> +    stack->clip_rect.left = 0.0f;
> +    stack->clip_rect.top = 0.0f;
> +    stack->clip_rect.right = w;
> +    stack->clip_rect.bottom = h;
> +
> +    for (i = 0; i < stack->current; ++i)
> +    {
> +        d2d_rect_intersect(&stack->clip_rect, &stack->stack[i]);
> +    }
> +}

Would it be possible to store the clipped rectangles in the stack
instead (so that stack->clip_rect == stack->stack[stack->current] at
any given moment)? That way you don't need to recompute clip_rect on
each pop.