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/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkPathUtils.h"
#include "SkBitmap.h"
#include "SkCanvas.h"
#include "SkRandom.h"
#include "SkTime.h"
#include "Test.h"
const int kNumIt = 100;
static void fill_random_bits(int chars, char* bits){
SkMWCRandom rand(SkTime::GetMSecs());
for (int i = 0; i < chars; ++i){
bits[i] = rand.nextU();
}
}
static int get_bit(const char* buffer, int x) {
int byte = x >> 3;
int bit = x & 7;
return buffer[byte] & (128 >> bit);
}
/* // useful for debugging errors
#include <iostream>
static void print_bits( const char* bits, int w, int h) {
for (int y = 0; y < h; ++y) {
for (int x = 0; x < w; ++x){
bool bit = get_bit(&bits[y], x)!=0;
std::cout << bit;
}
std::cout << std::endl;
}
}
static void print_bmp( SkBitmap* bmp, int w, int h){
for (int y = 0; y < h; ++y) {
for (int x = 0; x < w; ++x) {
int d = *bmp->getAddr32(x,y);
if (d == -1)
std::cout << 0;
else
std::cout << 1;
}
std::cout << std::endl;
}
}
*/
static void binary_to_skbitmap(const char* bin_bmp, SkBitmap* sk_bmp,
int w, int h, int rowBytes){
//init the SkBitmap
sk_bmp->setConfig(SkBitmap::kARGB_8888_Config, w, h);
sk_bmp->allocPixels();
for (int y = 0; y < h; ++y) { // for every row
const char* curLine = &bin_bmp[y * rowBytes];
for (int x = 0; x < w; ++x) {// for every pixel
if (get_bit(curLine, x)) {
*sk_bmp->getAddr32(x,y) = SK_ColorBLACK;
}
else {
*sk_bmp->getAddr32(x,y) = SK_ColorWHITE;
}
}
}
}
static bool test_bmp(skiatest::Reporter* reporter,
const SkBitmap* bmp1, const SkBitmap* bmp2,
int w, int h) {
for (int y = 0; y < h; ++y) { // loop through all pixels
for (int x = 0; x < w; ++x) {
REPORTER_ASSERT( reporter, *bmp1->getAddr32(x,y) == *bmp2->getAddr32(x,y) );
}
}
return true;
}
static void test_path_eq(skiatest::Reporter* reporter, const SkPath* path,
const SkBitmap* truth, int w, int h){
// make paint
SkPaint bmpPaint;
bmpPaint.setAntiAlias(true); // Black paint for bitmap
bmpPaint.setStyle(SkPaint::kFill_Style);
bmpPaint.setColor(SK_ColorBLACK);
// make bmp
SkBitmap bmp;
bmp.setConfig(SkBitmap::kARGB_8888_Config, w, h);
bmp.allocPixels();
SkCanvas canvas(bmp);
canvas.clear(SK_ColorWHITE);
canvas.drawPath(*path, bmpPaint);
// test bmp
test_bmp(reporter, truth, &bmp, w, h);
}
static void test_path(skiatest::Reporter* reporter, const SkBitmap* truth,
const char* bin_bmp, int w, int h, int rowBytes){
// make path
SkPath path;
SkPathUtils::BitsToPath_Path(&path, bin_bmp, w, h, rowBytes);
//test for correctness
test_path_eq(reporter, &path, truth, w, h);
}
static void test_region(skiatest::Reporter* reporter, const SkBitmap* truth,
const char* bin_bmp, int w, int h, int rowBytes){
//generate bitmap
SkPath path;
SkPathUtils::BitsToPath_Region(&path, bin_bmp, w, h, rowBytes);
//test for correctness
test_path_eq(reporter, &path, truth, w, h);
}
static void TestPathUtils(skiatest::Reporter* reporter) {
const int w[] = {4, 8, 12, 16};
const int h = 8, rowBytes = 4;
char bits[ h * rowBytes ];
static char* binBmp = &bits[0];
//loop to run randomized test lots of times
for (int it = 0; it < kNumIt; ++it)
{
// generate a random binary bitmap
fill_random_bits( h * rowBytes, binBmp); // generate random bitmap
// for each bitmap width, use subset of binary bitmap
for (unsigned int i = 0; i < SK_ARRAY_COUNT(w); ++i) {
// generate truth bitmap
SkBitmap bmpTruth;
binary_to_skbitmap(binBmp, &bmpTruth, w[i], h, rowBytes);
test_path(reporter, &bmpTruth, binBmp, w[i], h, rowBytes);
test_region(reporter, &bmpTruth, binBmp, w[i], h, rowBytes);
}
}
}
#include "TestClassDef.h"
DEFINE_TESTCLASS("PathUtils", PathUtils, TestPathUtils)
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