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window: Support transform in widget_cairo_create()

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If a buffer_transform it specified in the window we automatically
compensate for it in the cairo_t
This commit is contained in:
Alexander Larsson
2013-05-22 14:41:25 +02:00
committed by Kristian Høgsberg
parent 9777744cda
commit 15901f0377
1 changed files with 77 additions and 0 deletions
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clients/window.c
+77
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@@ -1621,6 +1621,81 @@ widget_get_cairo_surface(struct widget *widget)
return surface->cairo_surface;
}
static void
widget_cairo_update_transform(struct widget *widget, cairo_t *cr)
{
struct surface *surface = widget->surface;
double angle;
cairo_matrix_t m;
enum wl_output_transform transform;
int surface_width, surface_height;
int translate_x, translate_y;
surface_width = surface->allocation.width;
surface_height = surface->allocation.height;
transform = window_get_buffer_transform(widget->window);
switch (transform) {
case WL_OUTPUT_TRANSFORM_FLIPPED:
case WL_OUTPUT_TRANSFORM_FLIPPED_90:
case WL_OUTPUT_TRANSFORM_FLIPPED_180:
case WL_OUTPUT_TRANSFORM_FLIPPED_270:
cairo_matrix_init(&m, -1, 0, 0, 1, 0, 0);
break;
default:
cairo_matrix_init_identity(&m);
break;
}
switch (transform) {
case WL_OUTPUT_TRANSFORM_NORMAL:
default:
angle = 0;
translate_x = 0;
translate_y = 0;
break;
case WL_OUTPUT_TRANSFORM_FLIPPED:
angle = 0;
translate_x = surface_width;
translate_y = 0;
break;
case WL_OUTPUT_TRANSFORM_90:
angle = M_PI_2;
translate_x = surface_height;
translate_y = 0;
break;
case WL_OUTPUT_TRANSFORM_FLIPPED_90:
angle = M_PI_2;
translate_x = surface_height;
translate_y = surface_width;
break;
case WL_OUTPUT_TRANSFORM_180:
angle = M_PI;
translate_x = surface_width;
translate_y = surface_height;
break;
case WL_OUTPUT_TRANSFORM_FLIPPED_180:
angle = M_PI;
translate_x = 0;
translate_y = surface_height;
break;
case WL_OUTPUT_TRANSFORM_270:
angle = M_PI + M_PI_2;
translate_x = 0;
translate_y = surface_width;
break;
case WL_OUTPUT_TRANSFORM_FLIPPED_270:
angle = M_PI + M_PI_2;
translate_x = 0;
translate_y = 0;
break;
}
cairo_translate(cr, translate_x, translate_y);
cairo_rotate(cr, angle);
cairo_transform(cr, &m);
}
cairo_t *
widget_cairo_create(struct widget *widget)
{
@@ -1631,6 +1706,8 @@ widget_cairo_create(struct widget *widget)
cairo_surface = widget_get_cairo_surface(widget);
cr = cairo_create(cairo_surface);
widget_cairo_update_transform(widget, cr);
cairo_translate(cr, -surface->allocation.x, -surface->allocation.y);
return cr;