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// Copyright (c) 2009 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.
#include "chrome/browser/gtk/nine_box.h"
#include "app/resource_bundle.h"
#include "base/gfx/gtk_util.h"
#include "base/gfx/point.h"
#include "base/logging.h"
namespace {
// Draw pixbuf |src| into |dst| at position (x, y).
void DrawPixbuf(cairo_t* cr, GdkPixbuf* src, int x, int y) {
gdk_cairo_set_source_pixbuf(cr, src, x, y);
cairo_paint(cr);
}
// Tile pixbuf |src| across |cr| at |x|, |y| for |width| and |height|.
void TileImage(cairo_t* cr, GdkPixbuf* src,
int x, int y, int width, int height) {
gdk_cairo_set_source_pixbuf(cr, src, x, y);
cairo_pattern_set_extend(cairo_get_source(cr), CAIRO_EXTEND_REPEAT);
cairo_rectangle(cr, x, y, width, height);
cairo_fill(cr);
}
} // namespace
NineBox::NineBox(int top_left, int top, int top_right, int left, int center,
int right, int bottom_left, int bottom, int bottom_right) {
ResourceBundle& rb = ResourceBundle::GetSharedInstance();
images_[0] = top_left ? rb.GetPixbufNamed(top_left) : NULL;
images_[1] = top ? rb.GetPixbufNamed(top) : NULL;
images_[2] = top_right ? rb.GetPixbufNamed(top_right) : NULL;
images_[3] = left ? rb.GetPixbufNamed(left) : NULL;
images_[4] = center ? rb.GetPixbufNamed(center) : NULL;
images_[5] = right ? rb.GetPixbufNamed(right) : NULL;
images_[6] = bottom_left ? rb.GetPixbufNamed(bottom_left) : NULL;
images_[7] = bottom ? rb.GetPixbufNamed(bottom) : NULL;
images_[8] = bottom_right ? rb.GetPixbufNamed(bottom_right) : NULL;
}
NineBox::~NineBox() {
}
void NineBox::RenderToWidget(GtkWidget* dst) const {
int dst_width = dst->allocation.width;
int dst_height = dst->allocation.height;
cairo_t* cr = gdk_cairo_create(GDK_DRAWABLE(dst->window));
// For widgets that have their own window, the allocation (x,y) coordinates
// are GdkWindow relative. For other widgets, the coordinates are relative
// to their container.
if (GTK_WIDGET_NO_WINDOW(dst)) {
// Transform our cairo from window to widget coordinates.
cairo_translate(cr, dst->allocation.x, dst->allocation.y);
}
// The upper-left and lower-right corners of the center square in the
// rendering of the ninebox.
int x1 = gdk_pixbuf_get_width(images_[0]);
int y1 = gdk_pixbuf_get_height(images_[0]);
int x2 = images_[2] ? dst_width - gdk_pixbuf_get_width(images_[2]) : x1;
int y2 = images_[6] ? dst_height - gdk_pixbuf_get_height(images_[6]) : y1;
DCHECK_GE(x2, x1);
DCHECK_GE(y2, y1);
// Top row, center image is horizontally tiled.
if (images_[0])
DrawPixbuf(cr, images_[0], 0, 0);
if (images_[1])
RenderTopCenterStrip(cr, x1, 0, x2 - x1);
if (images_[2])
DrawPixbuf(cr, images_[2], x2, 0);
// Center row, all images are vertically tiled, center is horizontally tiled.
if (images_[3])
TileImage(cr, images_[3], 0, y1, x1, y2 - y1);
if (images_[4])
TileImage(cr, images_[4], x1, y1, x2 - x1, y2 - y1);
if (images_[5])
TileImage(cr, images_[5], x2, y1, dst_width - x2, y2 - y1);
// Bottom row, center image is horizontally tiled.
if (images_[6])
DrawPixbuf(cr, images_[6], 0, y2);
if (images_[7])
TileImage(cr, images_[7], x1, y2, x2 - x1, dst_height - y2);
if (images_[8])
DrawPixbuf(cr, images_[8], x2, y2);
cairo_destroy(cr);
}
void NineBox::RenderTopCenterStrip(cairo_t* cr,
int x, int y, int width) const {
const int height = gdk_pixbuf_get_height(images_[1]);
TileImage(cr, images_[1], x, y, width, height);
}
void NineBox::ChangeWhiteToTransparent() {
for (int image_idx = 0; image_idx < 9; ++image_idx) {
GdkPixbuf* pixbuf = images_[image_idx];
if (!pixbuf)
continue;
guchar* pixels = gdk_pixbuf_get_pixels(pixbuf);
int rowstride = gdk_pixbuf_get_rowstride(pixbuf);
for (int i = 0; i < gdk_pixbuf_get_height(pixbuf); ++i) {
for (int j = 0; j < gdk_pixbuf_get_width(pixbuf); ++j) {
guchar* pixel = &pixels[i * rowstride + j * 4];
if (pixel[0] == 0xff && pixel[1] == 0xff && pixel[2] == 0xff) {
pixel[3] = 0;
}
}
}
}
}
void NineBox::ContourWidget(GtkWidget* widget) const {
int x1 = gdk_pixbuf_get_width(images_[0]);
int x2 = widget->allocation.width - gdk_pixbuf_get_width(images_[2]);
// Paint the left and right sides.
GdkBitmap* mask = gdk_pixmap_new(NULL, widget->allocation.width,
widget->allocation.height, 1);
gdk_pixbuf_render_threshold_alpha(images_[0], mask,
0, 0,
0, 0, -1, -1,
1);
gdk_pixbuf_render_threshold_alpha(images_[2], mask,
0, 0,
x2, 0, -1, -1,
1);
// Assume no transparency in the middle rectangle.
cairo_t* cr = gdk_cairo_create(mask);
cairo_rectangle(cr, x1, 0, x2 - x1, widget->allocation.height);
cairo_fill(cr);
// Mask the widget's window's shape.
gtk_widget_shape_combine_mask(widget, mask, 0, 0);
g_object_unref(mask);
cairo_destroy(cr);
}
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