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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 "base/basictypes.h"
#include "gfx/blit.h"
#include "gfx/point.h"
#include "gfx/rect.h"
#include "skia/ext/platform_canvas.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace {
// Fills the given canvas with the values by duplicating the values into each
// color channel for the corresponding pixel.
//
// Example values = {{0x0, 0x01}, {0x12, 0xFF}} would give a canvas with:
// 0x00000000 0x01010101
// 0x12121212 0xFFFFFFFF
template<int w, int h>
void SetToCanvas(skia::PlatformCanvas* canvas, uint8 values[h][w]) {
SkBitmap& bitmap = const_cast<SkBitmap&>(
canvas->getTopPlatformDevice().accessBitmap(true));
SkAutoLockPixels lock(bitmap);
ASSERT_EQ(w, bitmap.width());
ASSERT_EQ(h, bitmap.height());
for (int y = 0; y < h; y++) {
for (int x = 0; x < w; x++) {
uint8 value = values[y][x];
*bitmap.getAddr32(x, y) =
(value << 24) | (value << 16) | (value << 8) | value;
}
}
}
// Checks each pixel in the given canvas and see if it is made up of the given
// values, where each value has been duplicated into each channel of the given
// bitmap (see SetToCanvas above).
template<int w, int h>
void VerifyCanvasValues(skia::PlatformCanvas* canvas, uint8 values[h][w]) {
SkBitmap& bitmap = const_cast<SkBitmap&>(
canvas->getTopPlatformDevice().accessBitmap(true));
SkAutoLockPixels lock(bitmap);
ASSERT_EQ(w, bitmap.width());
ASSERT_EQ(h, bitmap.height());
for (int y = 0; y < h; y++) {
for (int x = 0; x < w; x++) {
uint8 value = values[y][x];
uint32 expected =
(value << 24) | (value << 16) | (value << 8) | value;
ASSERT_EQ(expected, *bitmap.getAddr32(x, y));
}
}
}
} // namespace
TEST(Blit, ScrollCanvas) {
static const int kCanvasWidth = 5;
static const int kCanvasHeight = 5;
skia::PlatformCanvas canvas(kCanvasWidth, kCanvasHeight, true);
uint8 initial_values[kCanvasHeight][kCanvasWidth] = {
{ 0x00, 0x01, 0x02, 0x03, 0x04 },
{ 0x10, 0x11, 0x12, 0x13, 0x14 },
{ 0x20, 0x21, 0x22, 0x23, 0x24 },
{ 0x30, 0x31, 0x32, 0x33, 0x34 },
{ 0x40, 0x41, 0x42, 0x43, 0x44 }};
SetToCanvas<5, 5>(&canvas, initial_values);
// Sanity check on input.
VerifyCanvasValues<5, 5>(&canvas, initial_values);
// Scroll none and make sure it's a NOP.
gfx::ScrollCanvas(&canvas,
gfx::Rect(0, 0, kCanvasWidth, kCanvasHeight),
gfx::Point(0, 0));
VerifyCanvasValues<5, 5>(&canvas, initial_values);
// Scroll the center 3 pixels up one.
gfx::Rect center_three(1, 1, 3, 3);
gfx::ScrollCanvas(&canvas, center_three, gfx::Point(0, -1));
uint8 scroll_up_expected[kCanvasHeight][kCanvasWidth] = {
{ 0x00, 0x01, 0x02, 0x03, 0x04 },
{ 0x10, 0x21, 0x22, 0x23, 0x14 },
{ 0x20, 0x31, 0x32, 0x33, 0x24 },
{ 0x30, 0x31, 0x32, 0x33, 0x34 },
{ 0x40, 0x41, 0x42, 0x43, 0x44 }};
VerifyCanvasValues<5, 5>(&canvas, scroll_up_expected);
// Reset and scroll the center 3 pixels down one.
SetToCanvas<5, 5>(&canvas, initial_values);
gfx::ScrollCanvas(&canvas, center_three, gfx::Point(0, 1));
uint8 scroll_down_expected[kCanvasHeight][kCanvasWidth] = {
{ 0x00, 0x01, 0x02, 0x03, 0x04 },
{ 0x10, 0x11, 0x12, 0x13, 0x14 },
{ 0x20, 0x11, 0x12, 0x13, 0x24 },
{ 0x30, 0x21, 0x22, 0x23, 0x34 },
{ 0x40, 0x41, 0x42, 0x43, 0x44 }};
VerifyCanvasValues<5, 5>(&canvas, scroll_down_expected);
// Reset and scroll the center 3 pixels right one.
SetToCanvas<5, 5>(&canvas, initial_values);
gfx::ScrollCanvas(&canvas, center_three, gfx::Point(1, 0));
uint8 scroll_right_expected[kCanvasHeight][kCanvasWidth] = {
{ 0x00, 0x01, 0x02, 0x03, 0x04 },
{ 0x10, 0x11, 0x11, 0x12, 0x14 },
{ 0x20, 0x21, 0x21, 0x22, 0x24 },
{ 0x30, 0x31, 0x31, 0x32, 0x34 },
{ 0x40, 0x41, 0x42, 0x43, 0x44 }};
VerifyCanvasValues<5, 5>(&canvas, scroll_right_expected);
// Reset and scroll the center 3 pixels left one.
SetToCanvas<5, 5>(&canvas, initial_values);
gfx::ScrollCanvas(&canvas, center_three, gfx::Point(-1, 0));
uint8 scroll_left_expected[kCanvasHeight][kCanvasWidth] = {
{ 0x00, 0x01, 0x02, 0x03, 0x04 },
{ 0x10, 0x12, 0x13, 0x13, 0x14 },
{ 0x20, 0x22, 0x23, 0x23, 0x24 },
{ 0x30, 0x32, 0x33, 0x33, 0x34 },
{ 0x40, 0x41, 0x42, 0x43, 0x44 }};
VerifyCanvasValues<5, 5>(&canvas, scroll_left_expected);
// Diagonal scroll.
SetToCanvas<5, 5>(&canvas, initial_values);
gfx::ScrollCanvas(&canvas, center_three, gfx::Point(2, 2));
uint8 scroll_diagonal_expected[kCanvasHeight][kCanvasWidth] = {
{ 0x00, 0x01, 0x02, 0x03, 0x04 },
{ 0x10, 0x11, 0x12, 0x13, 0x14 },
{ 0x20, 0x21, 0x22, 0x23, 0x24 },
{ 0x30, 0x31, 0x32, 0x11, 0x34 },
{ 0x40, 0x41, 0x42, 0x43, 0x44 }};
VerifyCanvasValues<5, 5>(&canvas, scroll_diagonal_expected);
}
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