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// Copyright (c) 2012 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/ui/libgtk2ui/gtk2_util.h"
#include <gtk/gtk.h>
#include "base/command_line.h"
#include "base/logging.h"
#include "base/memory/scoped_ptr.h"
#include "skia/ext/platform_canvas.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/size.h"
namespace {
void CommonInitFromCommandLine(const CommandLine& command_line,
void (*init_func)(gint*, gchar***)) {
const std::vector<std::string>& args = command_line.argv();
int argc = args.size();
scoped_array<char *> argv(new char *[argc + 1]);
for (size_t i = 0; i < args.size(); ++i) {
// TODO(piman@google.com): can gtk_init modify argv? Just being safe
// here.
argv[i] = strdup(args[i].c_str());
}
argv[argc] = NULL;
char **argv_pointer = argv.get();
init_func(&argc, &argv_pointer);
for (size_t i = 0; i < args.size(); ++i) {
free(argv[i]);
}
}
} // namespace
namespace libgtk2ui {
void GtkInitFromCommandLine(const CommandLine& command_line) {
CommonInitFromCommandLine(command_line, gtk_init);
}
const SkBitmap GdkPixbufToImageSkia(GdkPixbuf* pixbuf) {
// TODO(erg): What do we do in the case where the pixbuf fails these dchecks?
// I would prefer to use our gtk based canvas, but that would require
// recompiling half of our skia extensions with gtk support, which we can't
// do in this build.
DCHECK_EQ(GDK_COLORSPACE_RGB, gdk_pixbuf_get_colorspace(pixbuf));
int n_channels = gdk_pixbuf_get_n_channels(pixbuf);
int w = gdk_pixbuf_get_width(pixbuf);
int h = gdk_pixbuf_get_height(pixbuf);
SkBitmap ret;
ret.setConfig(SkBitmap::kARGB_8888_Config, w, h);
ret.allocPixels();
ret.eraseColor(0);
uint32_t* skia_data = static_cast<uint32_t*>(ret.getAddr(0, 0));
if (n_channels == 4) {
int total_length = w * h;
guchar* gdk_pixels = gdk_pixbuf_get_pixels(pixbuf);
// Now here's the trick: we need to convert the gdk data (which is RGBA and
// isn't premultiplied) to skia (which can be anything and premultiplied).
for (int i = 0; i < total_length; ++i, gdk_pixels += 4) {
const unsigned char& red = gdk_pixels[0];
const unsigned char& green = gdk_pixels[1];
const unsigned char& blue = gdk_pixels[2];
const unsigned char& alpha = gdk_pixels[3];
skia_data[i] = SkPreMultiplyARGB(alpha, red, green, blue);
}
} else if (n_channels == 3) {
// Because GDK makes rowstrides word aligned, we need to do something a bit
// more complex when a pixel isn't perfectly a word of memory.
int rowstride = gdk_pixbuf_get_rowstride(pixbuf);
guchar* gdk_pixels = gdk_pixbuf_get_pixels(pixbuf);
for (int y = 0; y < h; ++y) {
int row = y * rowstride;
for (int x = 0; x < w; ++x) {
guchar* pixel = gdk_pixels + row + (x * 3);
const unsigned char& red = pixel[0];
const unsigned char& green = pixel[1];
const unsigned char& blue = pixel[2];
skia_data[y * w + x] = SkPreMultiplyARGB(255, red, green, blue);
}
}
} else {
NOTREACHED();
}
return ret;
}
} // namespace libgtk2ui
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