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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) {
// TODO(evanm): this is stupid; it should just be implemented with SkBitmaps
// and convert to a GdkPixbuf at the last second.
#ifndef NDEBUG
// Start by filling with a bright color so we can see any pixels
// we're missing.
gdk_pixbuf_fill(dst, 0x00FFFFFF);
#endif
// 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];
// The upper-left and lower-right corners of the center square in the
// rendering of the ninebox.
const int x1 = gdk_pixbuf_get_width(images[0]);
const int y1 = gdk_pixbuf_get_height(images[0]);
const int x2 = images[2] ?
gdk_pixbuf_get_width(dst) - gdk_pixbuf_get_width(images[2]) : x1;
const int y2 = images[6] ?
gdk_pixbuf_get_height(dst) - gdk_pixbuf_get_height(images[6]) : y1;
DCHECK(x2 >= x1);
DCHECK(y2 >= y1);
if (images[0])
DrawPixbuf(images[0], dst, 0, 0);
if (images[1])
RenderTopCenterStrip(dst, x1, x2);
if (images[2])
DrawPixbuf(images[2], dst, x2, 0);
// Center row. Needs vertical tiling.
images = &images_[1 * 3];
if (images[0]) {
TileImage(images[0], dst,
0, y1,
0, y2);
}
if (images[1]) {
const int delta_y = gdk_pixbuf_get_height(images[1]);
for (int y = y1; y < y2; y += delta_y) {
TileImage(images[1], dst,
x1, y,
x2, y);
}
}
if (images[2]) {
TileImage(images[2], dst,
x2, y1,
x2, y2);
}
// Bottom row.
images = &images_[2 * 3];
if (images[0])
DrawPixbuf(images[0], dst, 0, y2);
if (images[1]) {
TileImage(images[1], dst,
x1, y2,
x2, y2);
}
if (images[2])
DrawPixbuf(images[2], dst, x2, y2);
}
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 src_width = gdk_pixbuf_get_width(src);
const int src_height = gdk_pixbuf_get_height(src);
const int dst_width = gdk_pixbuf_get_width(dst);
const int dst_height = gdk_pixbuf_get_height(dst);
// We only tile along one axis (see above TODO about nuking all this code),
// dx or dy will be nonzero along that axis.
int dx = 0, dy = 0;
if (x2 > x1)
dx = src_width;
if (y2 > y1)
dy = src_height;
DCHECK(dx == 0 || dy == 0);
for (int x = x1, y = y1; x < x2 || y < y2; x += dx, y += dy) {
gdk_pixbuf_copy_area(src, 0, 0,
dx ? std::min(src_width, dst_width - x) : src_width,
dy ? std::min(src_height, dst_height - y) : src_height,
dst, x, y);
}
}
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