/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkColor.h"
#include "SkColorFilter.h"
#include "SkColorPriv.h"
#include "SkLumaColorFilter.h"
#include "SkReadBuffer.h"
#include "SkWriteBuffer.h"
#include "SkRandom.h"
#include "SkXfermode.h"
#include "Test.h"
static SkColorFilter* reincarnate_colorfilter(SkFlattenable* obj) {
SkWriteBuffer wb;
wb.writeFlattenable(obj);
size_t size = wb.bytesWritten();
SkAutoSMalloc<1024> storage(size);
// make a copy into storage
wb.writeToMemory(storage.get());
SkReadBuffer rb(storage.get(), size);
return rb.readColorFilter();
}
///////////////////////////////////////////////////////////////////////////////
static SkColorFilter* make_filter() {
// pick a filter that cannot compose with itself via newComposed()
return SkColorFilter::CreateModeFilter(SK_ColorRED, SkXfermode::kColorBurn_Mode);
}
static void test_composecolorfilter_limit(skiatest::Reporter* reporter) {
// Test that CreateComposeFilter() has some finite limit (i.e. that the factory can return null)
const int way_too_many = 100;
SkAutoTUnref<SkColorFilter> parent(make_filter());
for (int i = 2; i < way_too_many; ++i) {
SkAutoTUnref<SkColorFilter> filter(make_filter());
parent.reset(SkColorFilter::CreateComposeFilter(parent, filter));
if (nullptr == parent) {
REPORTER_ASSERT(reporter, i > 2); // we need to have succeeded at least once!
return;
}
}
REPORTER_ASSERT(reporter, false); // we never saw a nullptr :(
}
#define ILLEGAL_MODE ((SkXfermode::Mode)-1)
DEF_TEST(ColorFilter, reporter) {
SkRandom rand;
for (int mode = 0; mode <= SkXfermode::kLastMode; mode++) {
SkColor color = rand.nextU();
// ensure we always get a filter, by avoiding the possibility of a
// special case that would return nullptr (if color's alpha is 0 or 0xFF)
color = SkColorSetA(color, 0x7F);
SkColorFilter* cf = SkColorFilter::CreateModeFilter(color,
(SkXfermode::Mode)mode);
// allow for no filter if we're in Dst mode (its a no op)
if (SkXfermode::kDst_Mode == mode && nullptr == cf) {
continue;
}
SkAutoUnref aur(cf);
REPORTER_ASSERT(reporter, cf);
SkColor c = ~color;
SkXfermode::Mode m = ILLEGAL_MODE;
SkColor expectedColor = color;
SkXfermode::Mode expectedMode = (SkXfermode::Mode)mode;
// SkDebugf("--- mc [%d %x] ", mode, color);
REPORTER_ASSERT(reporter, cf->asColorMode(&c, &m));
// handle special-case folding by the factory
if (SkXfermode::kClear_Mode == mode) {
if (c != expectedColor) {
expectedColor = 0;
}
if (m != expectedMode) {
expectedMode = SkXfermode::kSrc_Mode;
}
}
// SkDebugf("--- got [%d %x] expected [%d %x]\n", m, c, expectedMode, expectedColor);
REPORTER_ASSERT(reporter, c == expectedColor);
REPORTER_ASSERT(reporter, m == expectedMode);
{
SkColorFilter* cf2 = reincarnate_colorfilter(cf);
SkAutoUnref aur2(cf2);
REPORTER_ASSERT(reporter, cf2);
SkColor c2 = ~color;
SkXfermode::Mode m2 = ILLEGAL_MODE;
REPORTER_ASSERT(reporter, cf2->asColorMode(&c2, &m2));
REPORTER_ASSERT(reporter, c2 == expectedColor);
REPORTER_ASSERT(reporter, m2 == expectedMode);
}
}
test_composecolorfilter_limit(reporter);
}
///////////////////////////////////////////////////////////////////////////////
DEF_TEST(LumaColorFilter, reporter) {
SkPMColor in, out;
SkAutoTUnref<SkColorFilter> lf(SkLumaColorFilter::Create());
// Applying luma to white produces black with the same transparency.
for (unsigned i = 0; i < 256; ++i) {
in = SkPackARGB32(i, i, i, i);
lf->filterSpan(&in, 1, &out);
REPORTER_ASSERT(reporter, SkGetPackedA32(out) == i);
REPORTER_ASSERT(reporter, SkGetPackedR32(out) == 0);
REPORTER_ASSERT(reporter, SkGetPackedG32(out) == 0);
REPORTER_ASSERT(reporter, SkGetPackedB32(out) == 0);
}
// Applying luma to black yields transparent black (luminance(black) == 0)
for (unsigned i = 0; i < 256; ++i) {
in = SkPackARGB32(i, 0, 0, 0);
lf->filterSpan(&in, 1, &out);
REPORTER_ASSERT(reporter, out == SK_ColorTRANSPARENT);
}
// For general colors, a luma filter generates black with an attenuated alpha channel.
for (unsigned i = 1; i < 256; ++i) {
in = SkPackARGB32(i, i, i / 2, i / 3);
lf->filterSpan(&in, 1, &out);
REPORTER_ASSERT(reporter, out != in);
REPORTER_ASSERT(reporter, SkGetPackedA32(out) <= i);
REPORTER_ASSERT(reporter, SkGetPackedR32(out) == 0);
REPORTER_ASSERT(reporter, SkGetPackedG32(out) == 0);
REPORTER_ASSERT(reporter, SkGetPackedB32(out) == 0);
}
}
///////////////////////////////////////////////////////////////////////////////
#include "SkColorMatrixFilter.h"
static void get_brightness_matrix(float amount, float matrix[20]) {
// Spec implementation
// (http://dvcs.w3.org/hg/FXTF/raw-file/tip/filters/index.html#brightnessEquivalent)
// <feFunc[R|G|B] type="linear" slope="[amount]">
memset(matrix, 0, 20 * sizeof(SkScalar));
matrix[0] = matrix[6] = matrix[12] = amount;
matrix[18] = 1.f;
}
static void get_grayscale_matrix(float amount, float matrix[20]) {
// Note, these values are computed to ensure MatrixNeedsClamping is false
// for amount in [0..1]
matrix[0] = 0.2126f + 0.7874f * amount;
matrix[1] = 0.7152f - 0.7152f * amount;
matrix[2] = 1.f - (matrix[0] + matrix[1]);
matrix[3] = matrix[4] = 0.f;
matrix[5] = 0.2126f - 0.2126f * amount;
matrix[6] = 0.7152f + 0.2848f * amount;
matrix[7] = 1.f - (matrix[5] + matrix[6]);
matrix[8] = matrix[9] = 0.f;
matrix[10] = 0.2126f - 0.2126f * amount;
matrix[11] = 0.7152f - 0.7152f * amount;
matrix[12] = 1.f - (matrix[10] + matrix[11]);
matrix[13] = matrix[14] = 0.f;
matrix[15] = matrix[16] = matrix[17] = matrix[19] = 0.f;
matrix[18] = 1.f;
}
static SkColorFilter* make_cf0() {
SkScalar matrix[20];
get_brightness_matrix(0.5f, matrix);
return SkColorMatrixFilter::Create(matrix);
}
static SkColorFilter* make_cf1() {
SkScalar matrix[20];
get_grayscale_matrix(1, matrix);
return SkColorMatrixFilter::Create(matrix);
}
static SkColorFilter* make_cf2() {
SkColorMatrix m0, m1;
get_brightness_matrix(0.5f, m0.fMat);
get_grayscale_matrix(1, m1.fMat);
m0.preConcat(m1);
return SkColorMatrixFilter::Create(m0);
}
static SkColorFilter* make_cf3() {
SkColorMatrix m0, m1;
get_brightness_matrix(0.5f, m0.fMat);
get_grayscale_matrix(1, m1.fMat);
m0.postConcat(m1);
return SkColorMatrixFilter::Create(m0);
}
typedef SkColorFilter* (*CFProc)();
// Test that a colormatrix that "should" preserve opaquness actually does.
DEF_TEST(ColorMatrixFilter, reporter) {
const CFProc procs[] = {
make_cf0, make_cf1, make_cf2, make_cf3,
};
for (size_t i = 0; i < SK_ARRAY_COUNT(procs); ++i) {
SkAutoTUnref<SkColorFilter> cf(procs[i]());
// generate all possible r,g,b triples
for (int r = 0; r < 256; ++r) {
for (int g = 0; g < 256; ++g) {
SkPMColor storage[256];
for (int b = 0; b < 256; ++b) {
storage[b] = SkPackARGB32(0xFF, r, g, b);
}
cf->filterSpan(storage, 256, storage);
for (int b = 0; b < 256; ++b) {
REPORTER_ASSERT(reporter, 0xFF == SkGetPackedA32(storage[b]));
}
}
}
}
}