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/*
* Copyright 2017 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "gm.h"
#include "sk_tool_utils.h"
#include "SkSurface.h"
#if SK_SUPPORT_GPU
#include "GrContextPriv.h"
#include "GrProxyProvider.h"
#include "SkImage_Gpu.h"
static const int kNumMatrices = 6;
static const int kImageSize = 128;
static const int kLabelSize = 32;
static const int kNumLabels = 4;
static const int kInset = 16;
static const int kCellSize = kImageSize+2*kLabelSize;
static const int kGMWidth = kNumMatrices*kCellSize;
static const int kGMHeight = 4*kCellSize;
static const SkPoint kPoints[kNumLabels] = {
{ 0, kImageSize }, // LL
{ kImageSize, kImageSize }, // LR
{ 0, 0 }, // UL
{ kImageSize, 0 }, // UR
};
static const SkMatrix kUVMatrices[kNumMatrices] = {
SkMatrix::MakeAll( 0, -1, 1,
-1, 0, 1,
0, 0, 1),
SkMatrix::MakeAll( 1, 0, 0,
0, -1, 1,
0, 0, 1),
// flip x
SkMatrix::MakeAll(-1, 0, 1,
0, 1, 0,
0, 0, 1),
SkMatrix::MakeAll( 0, 1, 0,
-1, 0, 1,
0, 0, 1),
// flip both x & y == rotate 180
SkMatrix::MakeAll(-1, 0, 1,
0, -1, 1,
0, 0, 1),
// identity
SkMatrix::MakeAll(1, 0, 0,
0, 1, 0,
0, 0, 1)
};
// Create a fixed size text label like "LL" or "LR".
static sk_sp<SkImage> make_text_image(GrContext* context, const char* text, SkColor color) {
SkPaint paint;
sk_tool_utils::set_portable_typeface(&paint);
paint.setAntiAlias(true);
paint.setTextSize(32);
paint.setColor(color);
SkRect bounds;
paint.measureText(text, strlen(text), &bounds);
const SkMatrix mat = SkMatrix::MakeRectToRect(bounds, SkRect::MakeWH(kLabelSize, kLabelSize),
SkMatrix::kFill_ScaleToFit);
const SkImageInfo ii = SkImageInfo::MakeN32Premul(kLabelSize, kLabelSize);
sk_sp<SkSurface> surf = SkSurface::MakeRaster(ii);
SkCanvas* canvas = surf->getCanvas();
canvas->clear(SK_ColorWHITE);
canvas->concat(mat);
canvas->drawText(text, strlen(text), 0, 0, paint);
sk_sp<SkImage> image = surf->makeImageSnapshot();
return image->makeTextureImage(context, nullptr);
}
static SkColor swap_red_and_blue(SkColor c) {
return SkColorSetRGB(SkColorGetB(c), SkColorGetG(c), SkColorGetR(c));
}
// Create an image with each corner marked w/ "LL", "LR", etc., with the origin either bottom-left
// or top-left.
static sk_sp<SkImage> make_reference_image(GrContext* context,
const SkTArray<sk_sp<SkImage>>& labels,
bool bottomLeftOrigin) {
GrProxyProvider* proxyProvider = context->contextPriv().proxyProvider();
SkASSERT(kNumLabels == labels.count());
SkImageInfo ii = SkImageInfo::Make(kImageSize, kImageSize,
kN32_SkColorType, kOpaque_SkAlphaType);
SkBitmap bm;
bm.allocPixels(ii);
SkCanvas canvas(bm);
canvas.clear(SK_ColorWHITE);
for (int i = 0; i < kNumLabels; ++i) {
canvas.drawImage(labels[i],
0.0 != kPoints[i].fX ? kPoints[i].fX-kLabelSize-kInset : kInset,
0.0 != kPoints[i].fY ? kPoints[i].fY-kLabelSize-kInset : kInset);
}
GrSurfaceDesc desc;
desc.fOrigin = kTopLeft_GrSurfaceOrigin;
desc.fWidth = kImageSize;
desc.fHeight = kImageSize;
desc.fConfig = kRGBA_8888_GrPixelConfig;
if (bottomLeftOrigin) {
// Note that Ganesh will flip the data when it is uploaded
desc.fOrigin = kBottomLeft_GrSurfaceOrigin;
}
if (kN32_SkColorType == kBGRA_8888_SkColorType) {
// We're playing a game here and uploading N32 data into an RGB dest. We might have
// to swap red & blue to compensate.
for (int y = 0; y < bm.height(); ++y) {
uint32_t *sl = bm.getAddr32(0, y);
for (int x = 0; x < bm.width(); ++x) {
sl[x] = swap_red_and_blue(sl[x]);
}
}
}
sk_sp<GrTextureProxy> proxy = proxyProvider->createTextureProxy(desc, SkBudgeted::kYes,
bm.getPixels(), bm.rowBytes());
if (!proxy) {
return nullptr;
}
return sk_make_sp<SkImage_Gpu>(context, kNeedNewImageUniqueID, kOpaque_SkAlphaType,
std::move(proxy), nullptr, SkBudgeted::kYes);
}
// Here we're converting from a matrix that is intended for UVs to a matrix that is intended
// for rect geometry used for a drawImage call. They are, in some sense, inverses of each
// other but we also need a scale to map from the [0..1] uv range to the actual size of
// image.
static bool UVMatToGeomMatForImage(SkMatrix* geomMat, const SkMatrix& uvMat) {
const SkMatrix yFlip = SkMatrix::MakeAll(1, 0, 0, 0, -1, 1, 0, 0, 1);
SkMatrix tmp = uvMat;
tmp.preConcat(yFlip);
tmp.preScale(1.0f/kImageSize, 1.0f/kImageSize);
tmp.postConcat(yFlip);
tmp.postScale(kImageSize, kImageSize);
return tmp.invert(geomMat);
}
// This GM exercises drawImage with a set of matrices that use an unusual amount of flips and
// rotates.
class FlippityGM : public skiagm::GM {
public:
FlippityGM() {
this->setBGColor(sk_tool_utils::color_to_565(0xFFCCCCCC));
}
protected:
SkString onShortName() override {
return SkString("flippity");
}
SkISize onISize() override {
return SkISize::Make(kGMWidth, kGMHeight);
}
// Draw the reference image and the four corner labels in the matrix's coordinate space
void drawImageWithMatrixAndLabels(SkCanvas* canvas, SkImage* image, int matIndex,
bool drawSubset, bool drawScaled) {
static const SkRect kSubsets[kNumMatrices] = {
SkRect::MakeXYWH(kInset, 0, kImageSize-kInset, kImageSize),
SkRect::MakeXYWH(0, kInset, kImageSize, kImageSize-kInset),
SkRect::MakeXYWH(0, 0, kImageSize-kInset, kImageSize),
SkRect::MakeXYWH(0, 0, kImageSize, kImageSize-kInset),
SkRect::MakeXYWH(kInset/2, kInset/2, kImageSize-kInset, kImageSize-kInset),
SkRect::MakeXYWH(kInset, kInset, kImageSize-2*kInset, kImageSize-2*kInset),
};
SkMatrix imageGeomMat;
SkAssertResult(UVMatToGeomMatForImage(&imageGeomMat, kUVMatrices[matIndex]));
canvas->save();
// draw the reference image
canvas->concat(imageGeomMat);
if (drawSubset) {
canvas->drawImageRect(image, kSubsets[matIndex],
drawScaled ? SkRect::MakeWH(kImageSize, kImageSize)
: kSubsets[matIndex],
nullptr, SkCanvas::kFast_SrcRectConstraint);
} else {
canvas->drawImage(image, 0, 0);
}
// draw the labels
for (int i = 0; i < kNumLabels; ++i) {
canvas->drawImage(fLabels[i],
0.0f == kPoints[i].fX ? -kLabelSize : kPoints[i].fX,
0.0f == kPoints[i].fY ? -kLabelSize : kPoints[i].fY);
}
canvas->restore();
}
void drawRow(GrContext* context, SkCanvas* canvas,
bool bottomLeftImage, bool drawSubset, bool drawScaled) {
sk_sp<SkImage> referenceImage = make_reference_image(context, fLabels, bottomLeftImage);
canvas->save();
canvas->translate(kLabelSize, kLabelSize);
for (int i = 0; i < kNumMatrices; ++i) {
this->drawImageWithMatrixAndLabels(canvas, referenceImage.get(), i,
drawSubset, drawScaled);
canvas->translate(kCellSize, 0);
}
canvas->restore();
}
void makeLabels(GrContext* context) {
static const char* kLabelText[kNumLabels] = { "LL", "LR", "UL", "UR" };
static const SkColor kLabelColors[kNumLabels] = {
SK_ColorRED,
SK_ColorGREEN,
SK_ColorBLUE,
SK_ColorCYAN
};
SkASSERT(!fLabels.count());
for (int i = 0; i < kNumLabels; ++i) {
fLabels.push_back(make_text_image(context, kLabelText[i], kLabelColors[i]));
}
SkASSERT(kNumLabels == fLabels.count());
}
void onDraw(SkCanvas* canvas) override {
GrContext* context = canvas->getGrContext();
if (!context) {
skiagm::GM::DrawGpuOnlyMessage(canvas);
return;
}
this->makeLabels(context);
canvas->save();
// Top row gets TL image
this->drawRow(context, canvas, false, false, false);
canvas->translate(0, kCellSize);
// Bottom row gets BL image
this->drawRow(context, canvas, true, false, false);
canvas->translate(0, kCellSize);
// Third row gets subsets of BL images
this->drawRow(context, canvas, true, true, false);
canvas->translate(0, kCellSize);
// Fourth row gets scaled subsets of BL images
this->drawRow(context, canvas, true, true, true);
canvas->restore();
// separator grid
for (int i = 0; i < 4; ++i) {
canvas->drawLine(0, i * kCellSize, kGMWidth, i * kCellSize, SkPaint());
}
for (int i = 0; i < kNumMatrices; ++i) {
canvas->drawLine(i * kCellSize, 0, i * kCellSize, kGMHeight, SkPaint());
}
}
private:
SkTArray<sk_sp<SkImage>> fLabels;
typedef GM INHERITED;
};
DEF_GM(return new FlippityGM;)
#endif