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moz-skia/tests/ReadPixelsTest.cpp

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C++
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/*
* 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 "Test.h"
#include "SkCanvas.h"
#include "SkColorPriv.h"
#include "SkDevice.h"
#include "SkMathPriv.h"
#include "SkRegion.h"
#if SK_SUPPORT_GPU
#include "SkGpuDevice.h"
#endif
static const int DEV_W = 100, DEV_H = 100;
static const SkIRect DEV_RECT = SkIRect::MakeWH(DEV_W, DEV_H);
static const SkRect DEV_RECT_S = SkRect::MakeWH(DEV_W * SK_Scalar1,
DEV_H * SK_Scalar1);
namespace {
SkPMColor getCanvasColor(int x, int y) {
SkASSERT(x >= 0 && x < DEV_W);
SkASSERT(y >= 0 && y < DEV_H);
U8CPU r = x;
U8CPU g = y;
U8CPU b = 0xc;
U8CPU a = 0xff;
switch ((x+y) % 5) {
case 0:
a = 0xff;
break;
case 1:
a = 0x80;
break;
case 2:
a = 0xCC;
break;
case 4:
a = 0x01;
break;
case 3:
a = 0x00;
break;
}
return SkPremultiplyARGBInline(a, r, g, b);
}
SkPMColor getBitmapColor(int x, int y, int w, int h) {
int n = y * w + x;
U8CPU b = n & 0xff;
U8CPU g = (n >> 8) & 0xff;
U8CPU r = (n >> 16) & 0xff;
return SkPackARGB32(0xff, r, g , b);
}
SkPMColor convertConfig8888ToPMColor(SkCanvas::Config8888 config8888,
uint32_t color,
bool* premul) {
const uint8_t* c = reinterpret_cast<uint8_t*>(&color);
U8CPU a,r,g,b;
*premul = false;
switch (config8888) {
case SkCanvas::kNative_Premul_Config8888:
return color;
case SkCanvas::kNative_Unpremul_Config8888:
*premul = true;
a = SkGetPackedA32(color);
r = SkGetPackedR32(color);
g = SkGetPackedG32(color);
b = SkGetPackedB32(color);
break;
case SkCanvas::kBGRA_Unpremul_Config8888:
*premul = true; // fallthru
case SkCanvas::kBGRA_Premul_Config8888:
a = static_cast<U8CPU>(c[3]);
r = static_cast<U8CPU>(c[2]);
g = static_cast<U8CPU>(c[1]);
b = static_cast<U8CPU>(c[0]);
break;
case SkCanvas::kRGBA_Unpremul_Config8888:
*premul = true; // fallthru
case SkCanvas::kRGBA_Premul_Config8888:
a = static_cast<U8CPU>(c[3]);
r = static_cast<U8CPU>(c[0]);
g = static_cast<U8CPU>(c[1]);
b = static_cast<U8CPU>(c[2]);
break;
}
if (*premul) {
r = SkMulDiv255Ceiling(r, a);
g = SkMulDiv255Ceiling(g, a);
b = SkMulDiv255Ceiling(b, a);
}
return SkPackARGB32(a, r, g, b);
}
void fillCanvas(SkCanvas* canvas) {
static SkBitmap bmp;
if (bmp.isNull()) {
bmp.setConfig(SkBitmap::kARGB_8888_Config, DEV_W, DEV_H);
bool alloc = bmp.allocPixels();
SkASSERT(alloc);
SkAutoLockPixels alp(bmp);
intptr_t pixels = reinterpret_cast<intptr_t>(bmp.getPixels());
for (int y = 0; y < DEV_H; ++y) {
for (int x = 0; x < DEV_W; ++x) {
SkPMColor* pixel = reinterpret_cast<SkPMColor*>(pixels + y * bmp.rowBytes() + x * bmp.bytesPerPixel());
*pixel = getCanvasColor(x, y);
}
}
}
canvas->save();
canvas->setMatrix(SkMatrix::I());
canvas->clipRect(DEV_RECT_S, SkRegion::kReplace_Op);
SkPaint paint;
paint.setXfermodeMode(SkXfermode::kSrc_Mode);
canvas->drawBitmap(bmp, 0, 0, &paint);
canvas->restore();
}
void fillBitmap(SkBitmap* bitmap) {
SkASSERT(bitmap->lockPixelsAreWritable());
SkAutoLockPixels alp(*bitmap);
int w = bitmap->width();
int h = bitmap->height();
intptr_t pixels = reinterpret_cast<intptr_t>(bitmap->getPixels());
for (int y = 0; y < h; ++y) {
for (int x = 0; x < w; ++x) {
SkPMColor* pixel = reinterpret_cast<SkPMColor*>(pixels + y * bitmap->rowBytes() + x * bitmap->bytesPerPixel());
*pixel = getBitmapColor(x, y, w, h);
}
}
}
bool checkPixel(SkPMColor a, SkPMColor b, bool didPremulConversion) {
if (!didPremulConversion) {
return a == b;
}
int32_t aA = static_cast<int32_t>(SkGetPackedA32(a));
int32_t aR = static_cast<int32_t>(SkGetPackedR32(a));
int32_t aG = static_cast<int32_t>(SkGetPackedG32(a));
int32_t aB = SkGetPackedB32(a);
int32_t bA = static_cast<int32_t>(SkGetPackedA32(b));
int32_t bR = static_cast<int32_t>(SkGetPackedR32(b));
int32_t bG = static_cast<int32_t>(SkGetPackedG32(b));
int32_t bB = static_cast<int32_t>(SkGetPackedB32(b));
return aA == bA &&
SkAbs32(aR - bR) <= 1 &&
SkAbs32(aG - bG) <= 1 &&
SkAbs32(aB - bB) <= 1;
}
// checks the bitmap contains correct pixels after the readPixels
// if the bitmap was prefilled with pixels it checks that these weren't
// overwritten in the area outside the readPixels.
bool checkRead(skiatest::Reporter* reporter,
const SkBitmap& bitmap,
int x, int y,
bool checkCanvasPixels,
bool checkBitmapPixels,
SkCanvas::Config8888 config8888) {
SkASSERT(SkBitmap::kARGB_8888_Config == bitmap.config());
SkASSERT(!bitmap.isNull());
SkASSERT(checkCanvasPixels || checkBitmapPixels);
int bw = bitmap.width();
int bh = bitmap.height();
SkIRect srcRect = SkIRect::MakeXYWH(x, y, bw, bh);
SkIRect clippedSrcRect = DEV_RECT;
if (!clippedSrcRect.intersect(srcRect)) {
clippedSrcRect.setEmpty();
}
bool failed = false;
SkAutoLockPixels alp(bitmap);
intptr_t pixels = reinterpret_cast<intptr_t>(bitmap.getPixels());
for (int by = 0; by < bh; ++by) {
for (int bx = 0; bx < bw; ++bx) {
int devx = bx + srcRect.fLeft;
int devy = by + srcRect.fTop;
uint32_t pixel = *reinterpret_cast<SkPMColor*>(pixels + by * bitmap.rowBytes() + bx * bitmap.bytesPerPixel());
if (clippedSrcRect.contains(devx, devy)) {
if (checkCanvasPixels) {
SkPMColor canvasPixel = getCanvasColor(devx, devy);
bool didPremul;
SkPMColor pmPixel = convertConfig8888ToPMColor(config8888, pixel, &didPremul);
bool check;
REPORTER_ASSERT(reporter, check = checkPixel(pmPixel, canvasPixel, didPremul));
if (!check) {
failed = true;
}
}
} else if (checkBitmapPixels) {
REPORTER_ASSERT(reporter, getBitmapColor(bx, by, bw, bh) == pixel);
if (getBitmapColor(bx, by, bw, bh) != pixel) {
failed = true;
}
}
}
}
return !failed;
}
enum BitmapInit {
kFirstBitmapInit = 0,
kNoPixels_BitmapInit = kFirstBitmapInit,
kTight_BitmapInit,
kRowBytes_BitmapInit,
kBitmapInitCnt
};
BitmapInit nextBMI(BitmapInit bmi) {
int x = bmi;
return static_cast<BitmapInit>(++x);
}
void init_bitmap(SkBitmap* bitmap, const SkIRect& rect, BitmapInit init) {
int w = rect.width();
int h = rect.height();
int rowBytes = 0;
bool alloc = true;
switch (init) {
case kNoPixels_BitmapInit:
alloc = false;
case kTight_BitmapInit:
break;
case kRowBytes_BitmapInit:
rowBytes = w * sizeof(SkPMColor) + 16 * sizeof(SkPMColor);
break;
default:
SkASSERT(0);
break;
}
bitmap->setConfig(SkBitmap::kARGB_8888_Config, w, h, rowBytes);
if (alloc) {
bitmap->allocPixels();
}
}
void ReadPixelsTest(skiatest::Reporter* reporter, GrContext* context) {
SkCanvas canvas;
const SkIRect testRects[] = {
// entire thing
DEV_RECT,
// larger on all sides
SkIRect::MakeLTRB(-10, -10, DEV_W + 10, DEV_H + 10),
// fully contained
SkIRect::MakeLTRB(DEV_W / 4, DEV_H / 4, 3 * DEV_W / 4, 3 * DEV_H / 4),
// outside top left
SkIRect::MakeLTRB(-10, -10, -1, -1),
// touching top left corner
SkIRect::MakeLTRB(-10, -10, 0, 0),
// overlapping top left corner
SkIRect::MakeLTRB(-10, -10, DEV_W / 4, DEV_H / 4),
// overlapping top left and top right corners
SkIRect::MakeLTRB(-10, -10, DEV_W + 10, DEV_H / 4),
// touching entire top edge
SkIRect::MakeLTRB(-10, -10, DEV_W + 10, 0),
// overlapping top right corner
SkIRect::MakeLTRB(3 * DEV_W / 4, -10, DEV_W + 10, DEV_H / 4),
// contained in x, overlapping top edge
SkIRect::MakeLTRB(DEV_W / 4, -10, 3 * DEV_W / 4, DEV_H / 4),
// outside top right corner
SkIRect::MakeLTRB(DEV_W + 1, -10, DEV_W + 10, -1),
// touching top right corner
SkIRect::MakeLTRB(DEV_W, -10, DEV_W + 10, 0),
// overlapping top left and bottom left corners
SkIRect::MakeLTRB(-10, -10, DEV_W / 4, DEV_H + 10),
// touching entire left edge
SkIRect::MakeLTRB(-10, -10, 0, DEV_H + 10),
// overlapping bottom left corner
SkIRect::MakeLTRB(-10, 3 * DEV_H / 4, DEV_W / 4, DEV_H + 10),
// contained in y, overlapping left edge
SkIRect::MakeLTRB(-10, DEV_H / 4, DEV_W / 4, 3 * DEV_H / 4),
// outside bottom left corner
SkIRect::MakeLTRB(-10, DEV_H + 1, -1, DEV_H + 10),
// touching bottom left corner
SkIRect::MakeLTRB(-10, DEV_H, 0, DEV_H + 10),
// overlapping bottom left and bottom right corners
SkIRect::MakeLTRB(-10, 3 * DEV_H / 4, DEV_W + 10, DEV_H + 10),
// touching entire left edge
SkIRect::MakeLTRB(0, DEV_H, DEV_W, DEV_H + 10),
// overlapping bottom right corner
SkIRect::MakeLTRB(3 * DEV_W / 4, 3 * DEV_H / 4, DEV_W + 10, DEV_H + 10),
// overlapping top right and bottom right corners
SkIRect::MakeLTRB(3 * DEV_W / 4, -10, DEV_W + 10, DEV_H + 10),
};
for (int dtype = 0; dtype < 2; ++dtype) {
if (0 == dtype) {
canvas.setDevice(new SkDevice(SkBitmap::kARGB_8888_Config,
DEV_W,
DEV_H,
false))->unref();
} else {
// GPU device known not to work in the fixed pt build.
#if defined(SK_SCALAR_IS_FIXED) || !SK_SUPPORT_GPU
continue;
#else
canvas.setDevice(new SkGpuDevice(context,
SkBitmap::kARGB_8888_Config,
DEV_W,
DEV_H))->unref();
#endif
}
fillCanvas(&canvas);
static const SkCanvas::Config8888 gReadConfigs[] = {
SkCanvas::kNative_Premul_Config8888,
SkCanvas::kNative_Unpremul_Config8888,
/**
* There is a bug in Ganesh (http://code.google.com/p/skia/issues/detail?id=438)
* that causes the readback of pixels from BGRA canvas to an RGBA bitmap to
* fail. This should be removed as soon as the issue above is resolved.
*/
#if !defined(SK_BUILD_FOR_ANDROID)
SkCanvas::kBGRA_Premul_Config8888,
SkCanvas::kBGRA_Unpremul_Config8888,
#endif
SkCanvas::kRGBA_Premul_Config8888,
SkCanvas::kRGBA_Unpremul_Config8888,
};
for (size_t rect = 0; rect < SK_ARRAY_COUNT(testRects); ++rect) {
const SkIRect& srcRect = testRects[rect];
for (BitmapInit bmi = kFirstBitmapInit;
bmi < kBitmapInitCnt;
bmi = nextBMI(bmi)) {
for (size_t c = 0; c < SK_ARRAY_COUNT(gReadConfigs); ++c) {
SkCanvas::Config8888 config8888 = gReadConfigs[c];
SkBitmap bmp;
init_bitmap(&bmp, srcRect, bmi);
// if the bitmap has pixels allocated before the readPixels,
// note that and fill them with pattern
bool startsWithPixels = !bmp.isNull();
if (startsWithPixels) {
fillBitmap(&bmp);
}
bool success =
canvas.readPixels(&bmp, srcRect.fLeft,
srcRect.fTop, config8888);
// we expect to succeed when the read isn't fully clipped
// out.
bool expectSuccess = SkIRect::Intersects(srcRect, DEV_RECT);
// determine whether we expected the read to succeed.
REPORTER_ASSERT(reporter, success == expectSuccess);
if (success || startsWithPixels) {
checkRead(reporter, bmp, srcRect.fLeft, srcRect.fTop,
success, startsWithPixels, config8888);
} else {
// if we had no pixels beforehand and the readPixels
// failed then our bitmap should still not have pixels
REPORTER_ASSERT(reporter, bmp.isNull());
}
}
// check the old webkit version of readPixels that clips the
// bitmap size
SkBitmap wkbmp;
bool success = canvas.readPixels(srcRect, &wkbmp);
SkIRect clippedRect = DEV_RECT;
if (clippedRect.intersect(srcRect)) {
REPORTER_ASSERT(reporter, success);
checkRead(reporter, wkbmp, clippedRect.fLeft,
clippedRect.fTop, true, false,
SkCanvas::kNative_Premul_Config8888);
} else {
REPORTER_ASSERT(reporter, !success);
}
}
}
}
}
}
#include "TestClassDef.h"
DEFINE_GPUTESTCLASS("ReadPixels", ReadPixelsTestClass, ReadPixelsTest)
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