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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/gfx/gtk_util.h"
#include "base/gfx/point.h"
#include "base/logging.h"
#include "chrome/common/resource_bundle.h"
namespace {
// Get the (x,y) coordinates of the widget relative to its GdkWindow.
gfx::Point GetWindowRelativeCoords(GtkWidget* widget) {
// GtkAllocation (x, y) is relative to widget->window for NO_WINDOW widgets.
if (GTK_WIDGET_NO_WINDOW(widget))
return gfx::Point(widget->allocation.x, widget->allocation.y);
return gfx::Point();
}
// Draw pixbuf |src| into |dst| at position (x, y).
void DrawPixbuf(GtkWidget* dst, GdkPixbuf* src, int x, int y) {
gfx::Point offset = GetWindowRelativeCoords(dst);
GdkGC* gc = dst->style->fg_gc[GTK_WIDGET_STATE(dst)];
gdk_draw_pixbuf(dst->window, // The destination drawable.
gc, // Graphics context.
src, 0, 0, // Source image and x,y offset.
offset.x() + x, offset.y() + y, -1, -1, // x, y, width, height.
GDK_RGB_DITHER_NONE, 0, 0); // Dithering mode, x,y offsets.
}
} // anonymous 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 {
// TODO(evanm): this is stupid; it should just be implemented with SkBitmaps
// and convert to a GdkPixbuf at the last second.
int dst_width = dst->allocation.width;
int dst_height = dst->allocation.height;
// 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* const* 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] ? dst_width - gdk_pixbuf_get_width(images[2]) : x1;
const int y2 = images[6] ? dst_height - gdk_pixbuf_get_height(images[6]) : y1;
DCHECK_GE(x2, x1);
DCHECK_GE(y2, y1);
if (images[0])
DrawPixbuf(dst, images[0], 0, 0);
if (images[1])
RenderTopCenterStrip(dst, x1, x2, 0);
if (images[2])
DrawPixbuf(dst, images[2], x2, 0);
// Center row. Needs vertical tiling.
images = &images_[1 * 3];
if (images[0]) {
TileImage(dst, images[0],
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(dst, images[1],
x1, y,
x2, y);
}
}
if (images[2]) {
TileImage(dst, images[2],
x2, y1,
x2, y2);
}
// Bottom row.
images = &images_[2 * 3];
if (images[0])
DrawPixbuf(dst, images[0], 0, y2);
if (images[1]) {
TileImage(dst, images[1],
x1, y2,
x2, y2);
}
if (images[2])
DrawPixbuf(dst, images[2], x2, y2);
}
void NineBox::RenderTopCenterStrip(GtkWidget* dst, int x1,
int x2, int y1) const {
TileImage(dst, images_[1],
x1, y1,
x2, y1);
}
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);
}
void NineBox::TileImage(GtkWidget* dst, GdkPixbuf* src,
int x1, int y1, int x2, int y2) const {
GdkGC* gc = dst->style->fg_gc[GTK_WIDGET_STATE(dst)];
const int src_width = gdk_pixbuf_get_width(src);
const int src_height = gdk_pixbuf_get_height(src);
const int dst_width = dst->allocation.width;
const int dst_height = dst->allocation.height;
gfx::Point offset = GetWindowRelativeCoords(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_draw_pixbuf(dst->window, gc, src, 0, 0,
offset.x() + x, offset.y() + y,
dx ? std::min(src_width, dst_width - x) : src_width,
dy ? std::min(src_height, dst_height - y) : src_height,
GDK_RGB_DITHER_NONE, 0, 0);
}
}
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