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/*
* Copyright 2018 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkCanvas.h"
#include "SkCommandLineFlags.h"
#include "SkGraphics.h"
#include "SkMakeUnique.h"
#include "SkOSFile.h"
#include "SkOSPath.h"
#include "SkPictureRecorder.h"
#include "SkStream.h"
#include "SkSurface.h"
#if defined(SK_ENABLE_SKOTTIE)
#include "Skottie.h"
#endif
DEFINE_string2(input , i, nullptr, "Input .json file.");
DEFINE_string2(writePath, w, nullptr, "Output directory. Frames are names [0-9]{6}.png.");
DEFINE_string2(format , f, "png" , "Output format (png or skp)");
DEFINE_double(t0, 0, "Timeline start [0..1].");
DEFINE_double(t1, 1, "Timeline stop [0..1].");
DEFINE_double(fps, 30, "Decode frames per second.");
DEFINE_int32(width , 800, "Render width.");
DEFINE_int32(height, 600, "Render height.");
namespace {
class Sink : public SkNoncopyable {
public:
virtual ~Sink() = default;
bool handleFrame(const sk_sp<skottie::Animation>& anim, size_t idx) const {
const auto frame_file = SkStringPrintf("0%06d.%s", idx, fExtension.c_str());
SkFILEWStream stream (SkOSPath::Join(FLAGS_writePath[0], frame_file.c_str()).c_str());
if (!stream.isValid()) {
SkDebugf("Could not open '%s/%s' for writing.\n",
FLAGS_writePath[0], frame_file.c_str());
return false;
}
return this->saveFrame(anim, &stream);
}
protected:
Sink(const char* ext) : fExtension(ext) {}
virtual bool saveFrame(const sk_sp<skottie::Animation>& anim, SkFILEWStream*) const = 0;
private:
const SkString fExtension;
using INHERITED = SkNoncopyable;
};
class PNGSink final : public Sink {
public:
PNGSink()
: INHERITED("png")
, fSurface(SkSurface::MakeRasterN32Premul(FLAGS_width, FLAGS_height)) {
if (!fSurface) {
SkDebugf("Could not allocate a %d x %d surface.\n", FLAGS_width, FLAGS_height);
}
}
bool saveFrame(const sk_sp<skottie::Animation>& anim, SkFILEWStream* stream) const override {
if (!fSurface) return false;
auto* canvas = fSurface->getCanvas();
SkAutoCanvasRestore acr(canvas, true);
canvas->concat(SkMatrix::MakeRectToRect(SkRect::MakeSize(anim->size()),
SkRect::MakeIWH(FLAGS_width, FLAGS_height),
SkMatrix::kCenter_ScaleToFit));
canvas->clear(SK_ColorTRANSPARENT);
anim->render(canvas);
auto png_data = fSurface->makeImageSnapshot()->encodeToData();
if (!png_data) {
SkDebugf("Failed to encode frame!\n");
return false;
}
return stream->write(png_data->data(), png_data->size());
}
private:
const sk_sp<SkSurface> fSurface;
using INHERITED = Sink;
};
class SKPSink final : public Sink {
public:
SKPSink() : INHERITED("skp") {}
bool saveFrame(const sk_sp<skottie::Animation>& anim, SkFILEWStream* stream) const override {
SkPictureRecorder recorder;
auto canvas = recorder.beginRecording(FLAGS_width, FLAGS_height);
canvas->concat(SkMatrix::MakeRectToRect(SkRect::MakeSize(anim->size()),
SkRect::MakeIWH(FLAGS_width, FLAGS_height),
SkMatrix::kCenter_ScaleToFit));
anim->render(canvas);
recorder.finishRecordingAsPicture()->serialize(stream);
return true;
}
private:
const sk_sp<SkSurface> fSurface;
using INHERITED = Sink;
};
} // namespace
int main(int argc, char** argv) {
SkCommandLineFlags::Parse(argc, argv);
SkAutoGraphics ag;
if (FLAGS_input.isEmpty() || FLAGS_writePath.isEmpty()) {
SkDebugf("Missing required 'input' and 'writePath' args.\n");
return 1;
}
if (FLAGS_fps <= 0) {
SkDebugf("Invalid fps: %f.\n", FLAGS_fps);
return 1;
}
if (!sk_mkdir(FLAGS_writePath[0])) {
return 1;
}
std::unique_ptr<Sink> sink;
if (0 == strcmp(FLAGS_format[0], "png")) {
sink = skstd::make_unique<PNGSink>();
} else if (0 == strcmp(FLAGS_format[0], "skp")) {
sink = skstd::make_unique<SKPSink>();
} else {
SkDebugf("Unknown format: %s\n", FLAGS_format[0]);
return 1;
}
auto anim = skottie::Animation::MakeFromFile(FLAGS_input[0]);
if (!anim) {
SkDebugf("Could not load animation: '%s'.\n", FLAGS_input[0]);
return 1;
}
static constexpr double kMaxFrames = 10000;
const auto t0 = SkTPin(FLAGS_t0, 0.0, 1.0),
t1 = SkTPin(FLAGS_t1, t0, 1.0),
advance = 1 / std::min(anim->duration() * FLAGS_fps, kMaxFrames);
size_t frame_index = 0;
for (auto t = t0; t <= t1; t += advance) {
anim->seek(t);
sink->handleFrame(anim, frame_index++);
}
return 0;
}
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