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// Copyright 2014 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 "ui/base/cursor/cursor_util.h"
#include "base/logging.h"
#include "skia/ext/image_operations.h"
#include "ui/base/resource/resource_bundle.h"
#include "ui/gfx/geometry/point_conversions.h"
#include "ui/gfx/geometry/size_conversions.h"
#include "ui/gfx/image/image_skia.h"
#include "ui/gfx/skbitmap_operations.h"
#include "ui/gfx/skia_util.h"
namespace ui {
void ScaleAndRotateCursorBitmapAndHotpoint(float scale,
gfx::Display::Rotation rotation,
SkBitmap* bitmap,
gfx::Point* hotpoint) {
switch (rotation) {
case gfx::Display::ROTATE_0:
break;
case gfx::Display::ROTATE_90:
hotpoint->SetPoint(bitmap->height() - hotpoint->y(), hotpoint->x());
*bitmap = SkBitmapOperations::Rotate(
*bitmap, SkBitmapOperations::ROTATION_90_CW);
break;
case gfx::Display::ROTATE_180:
hotpoint->SetPoint(
bitmap->width() - hotpoint->x(), bitmap->height() - hotpoint->y());
*bitmap = SkBitmapOperations::Rotate(
*bitmap, SkBitmapOperations::ROTATION_180_CW);
break;
case gfx::Display::ROTATE_270:
hotpoint->SetPoint(hotpoint->y(), bitmap->width() - hotpoint->x());
*bitmap = SkBitmapOperations::Rotate(
*bitmap, SkBitmapOperations::ROTATION_270_CW);
break;
}
if (scale < FLT_EPSILON) {
NOTREACHED() << "Scale must be larger than 0.";
scale = 1.0f;
}
if (scale == 1.0f)
return;
gfx::Size scaled_size = gfx::ToFlooredSize(
gfx::ScaleSize(gfx::Size(bitmap->width(), bitmap->height()), scale));
*bitmap = skia::ImageOperations::Resize(
*bitmap,
skia::ImageOperations::RESIZE_BETTER,
scaled_size.width(),
scaled_size.height());
*hotpoint = gfx::ToFlooredPoint(gfx::ScalePoint(*hotpoint, scale));
}
void GetImageCursorBitmap(int resource_id,
float scale,
gfx::Display::Rotation rotation,
gfx::Point* hotspot,
SkBitmap* bitmap) {
const gfx::ImageSkia* image =
ResourceBundle::GetSharedInstance().GetImageSkiaNamed(resource_id);
const gfx::ImageSkiaRep& image_rep = image->GetRepresentation(scale);
// TODO(oshima): The cursor should use resource scale factor when
// fractional scale factor is enabled. crbug.com/372212
(*bitmap) = image_rep.sk_bitmap();
ScaleAndRotateCursorBitmapAndHotpoint(
scale / image_rep.scale(), rotation, bitmap, hotspot);
// |image_rep| is owned by the resource bundle. So we do not need to free it.
}
void GetAnimatedCursorBitmaps(int resource_id,
float scale,
gfx::Display::Rotation rotation,
gfx::Point* hotspot,
std::vector<SkBitmap>* bitmaps) {
// TODO(oshima|tdanderson): Support rotation and fractional scale factor.
const gfx::ImageSkia* image =
ResourceBundle::GetSharedInstance().GetImageSkiaNamed(resource_id);
const gfx::ImageSkiaRep& image_rep = image->GetRepresentation(scale);
SkBitmap bitmap = image_rep.sk_bitmap();
int frame_width = bitmap.height();
int frame_height = frame_width;
int total_width = bitmap.width();
DCHECK_EQ(total_width % frame_width, 0);
int frame_count = total_width / frame_width;
DCHECK_GT(frame_count, 0);
bitmaps->resize(frame_count);
for (int frame = 0; frame < frame_count; ++frame) {
int x_offset = frame_width * frame;
DCHECK_LE(x_offset + frame_width, total_width);
SkBitmap cropped = SkBitmapOperations::CreateTiledBitmap(
bitmap, x_offset, 0, frame_width, frame_height);
DCHECK_EQ(frame_width, cropped.width());
DCHECK_EQ(frame_height, cropped.height());
(*bitmaps)[frame] = cropped;
}
}
} // namespace ui
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