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/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include <SkSurface.h>
#include "gm.h"
#include "SkBitmap.h"
#include "SkGradientShader.h"
#include "SkImage.h"
static sk_sp<SkImage> create_image(GrContext* context, int width, int height) {
sk_sp<SkSurface> surface;
SkImageInfo info = SkImageInfo::MakeN32Premul(width, height);
if (context) {
surface = SkSurface::MakeRenderTarget(context, SkBudgeted::kYes, info);
} else {
surface = SkSurface::MakeRaster(info);
}
if (!surface) {
return nullptr;
}
// Create an RGB image from which we will extract planes
SkPaint paint;
constexpr SkColor kColors[] =
{ SK_ColorBLUE, SK_ColorYELLOW, SK_ColorGREEN, SK_ColorWHITE };
SkScalar r = (width + height) / 4.f;
paint.setShader(SkGradientShader::MakeRadial(SkPoint::Make(0,0), r, kColors,
nullptr, SK_ARRAY_COUNT(kColors),
SkShader::kMirror_TileMode));
surface->getCanvas()->drawPaint(paint);
return surface->makeImageSnapshot();
}
DEF_SIMPLE_GM(image_to_yuv_planes, canvas, 120, 525) {
constexpr SkScalar kPad = 5.f;
constexpr int kImageSize = 32;
GrContext *context = canvas->getGrContext();
sk_sp<SkImage> rgbImage(create_image(context, kImageSize, kImageSize));
if (!rgbImage) {
return;
}
canvas->drawImage(rgbImage.get(), kPad, kPad);
// Test cases where all three planes are the same size, where just u and v are the same size,
// and where all differ.
constexpr SkISize kSizes[][3] = {
{{kImageSize, kImageSize}, {kImageSize , kImageSize }, {kImageSize, kImageSize }},
{{kImageSize, kImageSize}, {kImageSize/2, kImageSize/2}, {kImageSize/2, kImageSize/2}},
{{kImageSize, kImageSize}, {kImageSize/2, kImageSize/2}, {kImageSize/3, kImageSize/3}}
};
// A mix of rowbytes triples to go with the above sizes.
constexpr size_t kRowBytes[][3] {
{0, 0, 0},
{kImageSize, kImageSize/2 + 1, kImageSize},
{kImageSize + 13, kImageSize, kImageSize/3 + 8}
};
SkScalar x = kPad;
for (size_t s = 0; s < SK_ARRAY_COUNT(kSizes); ++s) {
SkScalar y = rgbImage->height() + 2 * kPad;
const SkISize *sizes = kSizes[s];
size_t realRowBytes[3];
for (int i = 0; i < 3; ++i) {
realRowBytes[i] = kRowBytes[s][i] ? kRowBytes[s][i] : kSizes[s][i].fWidth;
}
std::unique_ptr<uint8_t[]> yPlane(new uint8_t[realRowBytes[0] * sizes[0].fHeight]);
std::unique_ptr<uint8_t[]> uPlane(new uint8_t[realRowBytes[1] * sizes[1].fHeight]);
std::unique_ptr<uint8_t[]> vPlane(new uint8_t[realRowBytes[2] * sizes[2].fHeight]);
void *planes[3] = {yPlane.get(), uPlane.get(), vPlane.get()};
// Convert the RGB image to YUV planes using each YUV color space and draw the YUV planes
// to the canvas.
SkBitmap yuvBmps[3];
yuvBmps[0].setInfo(SkImageInfo::MakeA8(sizes[0].fWidth, sizes[0].fHeight), kRowBytes[s][0]);
yuvBmps[1].setInfo(SkImageInfo::MakeA8(sizes[1].fWidth, sizes[1].fHeight), kRowBytes[s][1]);
yuvBmps[2].setInfo(SkImageInfo::MakeA8(sizes[2].fWidth, sizes[2].fHeight), kRowBytes[s][2]);
yuvBmps[0].setPixels(yPlane.get());
yuvBmps[1].setPixels(uPlane.get());
yuvBmps[2].setPixels(vPlane.get());
for (int space = kJPEG_SkYUVColorSpace; space <= kLastEnum_SkYUVColorSpace; ++space) {
// Clear the planes so we don't accidentally see the old values if there is a bug in
// readYUV8Planes().
memset(yPlane.get(), 0, realRowBytes[0] * sizes[0].fHeight);
memset(uPlane.get(), 0, realRowBytes[1] * sizes[1].fHeight);
memset(vPlane.get(), 0, realRowBytes[2] * sizes[2].fHeight);
if (rgbImage->readYUV8Planes(sizes, planes, kRowBytes[s],
static_cast<SkYUVColorSpace>(space))) {
yuvBmps[0].notifyPixelsChanged();
yuvBmps[1].notifyPixelsChanged();
yuvBmps[2].notifyPixelsChanged();
for (int i = 0; i < 3; ++i) {
canvas->drawBitmap(yuvBmps[i], x, y);
y += kPad + yuvBmps[i].height();
}
}
}
x += rgbImage->width() + kPad;
}
}
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