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// Copyright (c) 2010 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/cocoa/table_row_nsimage_cache.h"
#include "base/logging.h"
#include "skia/ext/skia_utils_mac.h"
#include "third_party/skia/include/core/SkBitmap.h"
TableRowNSImageCache::TableRowNSImageCache(Table* model)
: model_(model),
icon_images_([[NSPointerArray alloc] initWithOptions:
NSPointerFunctionsStrongMemory |
NSPointerFunctionsObjectPersonality]) {
int count = model_->RowCount();
[icon_images_ setCount:count];
}
void TableRowNSImageCache::OnModelChanged() {
int count = model_->RowCount();
[icon_images_ setCount:0];
[icon_images_ setCount:count];
}
void TableRowNSImageCache::OnItemsChanged(int start, int length) {
DCHECK_LE(start + length, static_cast<int>([icon_images_ count]));
for (int i = start; i < (start + length); ++i) {
[icon_images_ replacePointerAtIndex:i withPointer:NULL];
}
DCHECK_EQ(model_->RowCount(),
static_cast<int>([icon_images_ count]));
}
void TableRowNSImageCache::OnItemsAdded(int start, int length) {
DCHECK_LE(start, static_cast<int>([icon_images_ count]));
// -[NSPointerArray insertPointer:atIndex:] throws if index == count.
// Instead expand the array with NULLs.
if (start == static_cast<int>([icon_images_ count])) {
[icon_images_ setCount:start + length];
} else {
for (int i = 0; i < length; ++i) {
[icon_images_ insertPointer:NULL atIndex:start]; // Values slide up.
}
}
DCHECK_EQ(model_->RowCount(),
static_cast<int>([icon_images_ count]));
}
void TableRowNSImageCache::OnItemsRemoved(int start, int length) {
DCHECK_LE(start + length, static_cast<int>([icon_images_ count]));
for (int i = 0; i < length; ++i) {
[icon_images_ removePointerAtIndex:start]; // Values slide down.
}
DCHECK_EQ(model_->RowCount(),
static_cast<int>([icon_images_ count]));
}
NSImage* TableRowNSImageCache::GetImageForRow(int row) {
DCHECK_EQ(model_->RowCount(),
static_cast<int>([icon_images_ count]));
DCHECK_GE(row, 0);
DCHECK_LT(row, static_cast<int>([icon_images_ count]));
NSImage* image = static_cast<NSImage*>([icon_images_ pointerAtIndex:row]);
if (!image) {
const SkBitmap bitmap_icon =
model_->GetIcon(row);
// This means GetIcon() will get called until it returns a non-empty bitmap.
// Empty bitmaps are intentionally not cached.
if (!bitmap_icon.isNull()) {
image = gfx::SkBitmapToNSImage(bitmap_icon);
DCHECK(image);
[icon_images_ replacePointerAtIndex:row withPointer:image];
}
}
return image;
}
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