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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 "base/logging.h"
namespace {
// Draw pixbuf |src| into |dst| at position (x, y).
// Shorthand for gdk_pixbuf_copy_area.
void DrawPixbuf(GdkPixbuf* src, GdkPixbuf* dst, int x, int y) {
gdk_pixbuf_copy_area(src, 0, 0,
gdk_pixbuf_get_width(src),
gdk_pixbuf_get_height(src),
dst, x, y);
}
} // anonymous namespace
NineBox::NineBox(GdkPixbuf* images[9]) {
memcpy(images_, images, 9*sizeof(GdkPixbuf*));
}
NineBox::~NineBox() {
for (int i = 0; i < 9; ++i) {
if (images_[i])
gdk_pixbuf_unref(images_[i]);
}
}
void NineBox::RenderToPixbuf(GdkPixbuf* dst) {
// This function paints one row at a time.
// To make indexing sane, |images| points at the current row of images,
// so images[0] always refers to the left-most image of the current row.
GdkPixbuf** images = &images_[0];
// x, y coordinate of bottom right corner drawing offset.
int x = gdk_pixbuf_get_width(dst) - gdk_pixbuf_get_width(images[2]);
int y = gdk_pixbuf_get_height(dst) - gdk_pixbuf_get_height(images[2]);
DrawPixbuf(images[0], dst, 0, 0);
RenderTopCenterStrip(dst, gdk_pixbuf_get_width(images[0]), x);
DrawPixbuf(images[2], dst, x, 0);
// Center row. Needs vertical tiling.
images = &images_[1 * 3];
TileImage(images[0], dst,
0, gdk_pixbuf_get_height(images[0]),
0, y);
// TODO(port): tile center image if it exists.
DCHECK(images[1] == NULL);
TileImage(images[2], dst,
x, gdk_pixbuf_get_height(images[0]),
x, y);
// Bottom row.
images = &images_[2 * 3];
DrawPixbuf(images[0], dst, 0, y);
TileImage(images[1], dst,
gdk_pixbuf_get_width(images[0]), y,
x, y);
DrawPixbuf(images[2], dst, x, y);
}
void NineBox::RenderTopCenterStrip(GdkPixbuf* dst, int x1, int x2) {
TileImage(images_[1], dst,
x1, 0,
x2, 0);
}
void NineBox::TileImage(GdkPixbuf* src, GdkPixbuf* dst,
int x1, int y1, int x2, int y2) {
const int width = gdk_pixbuf_get_width(src);
const int height = gdk_pixbuf_get_height(src);
// Compute delta x or y.
int dx = 0, dy = 0;
if (x2 > x1)
dx = width;
if (y2 > y1)
dy = height;
for (int x = x1, y = y1;
x + width <= x2 || y + height <= y2;
x += dx, y += dy) {
DrawPixbuf(src, dst, x, y);
}
}
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