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// Copyright (c) 2010 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_GTK_NINE_BOX_H_
#define CHROME_BROWSER_GTK_NINE_BOX_H_
#include <gtk/gtk.h>
// A NineBox manages a set of source images representing a 3x3 grid, where
// non-corner images can be tiled to make a larger image. It's used to
// use bitmaps for constructing image-based resizable widgets like buttons.
//
// If you want just a vertical image that stretches in height but is fixed
// in width, only pass in images for the left column (leave others NULL).
// Similarly, for a horizontal image that stretches in width but is fixed in
// height, only pass in images for the top row.
//
// TODO(port): add support for caching server-side pixmaps of prerendered
// nineboxes.
class NineBox {
public:
// Construct a NineBox with nine images. Images are specified using resource
// ids that will be passed to the resource bundle. Use 0 for no image.
NineBox(int top_left, int top, int top_right, int left, int center, int right,
int bottom_left, int bottom, int bottom_right);
// Construct a NineBox from a single image and insets indicating the sizes
// of the edges and corners.
NineBox(int image, int top_margin, int bottom_margin, int left_margin,
int right_margin);
~NineBox();
// Render the NineBox to |dst|.
// The images will be tiled to fit into the widget.
void RenderToWidget(GtkWidget* dst) const;
// As above, but rendered partially transparent.
void RenderToWidgetWithOpacity(GtkWidget* dst, double opacity) const;
// Render the top row of images to |dst| between |x1| and |x1| + |width|.
// This is split from RenderToWidget so the toolbar can use it.
void RenderTopCenterStrip(cairo_t* cr, int x, int y, int width) const;
// Change all pixels that are white in |images_| to have 0 opacity.
void ChangeWhiteToTransparent();
// Set the shape of |widget| to match that of the ninebox. Note that |widget|
// must have its own window and be allocated. Also, currently only the top
// three images are used.
// TODO(estade): extend this function to use all 9 images (if it's ever
// needed).
void ContourWidget(GtkWidget* widget) const;
private:
GdkPixbuf* images_[9];
bool unref_pixbufs_on_destroy_;
};
#endif // CHROME_BROWSER_GTK_NINE_BOX_H_
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