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Reland "FPS and frame control for MSKP slide."

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This is a reland of 3b7587814d

Use SkTPin instead of std::clamp (C++17 library feature).

Original change's description:
> FPS and frame control for MSKP slide.
>
> Bug: skia:11900
> Change-Id: Ib4d8da6a86da7966e613de2d7cfd61ff545b296a
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/400676
> Commit-Queue: Brian Salomon <bsalomon@google.com>
> Reviewed-by: Jim Van Verth <jvanverth@google.com>

Bug: skia:11900
Change-Id: I29d3f6a717bbdd4e1fee3322e98d33e51a28f264
Cq-Include-Trybots: luci.skia.skia.primary:Housekeeper-PerCommit-CreateDockerImage_Skia_Release
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/402917
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
This commit is contained in:
Brian Salomon 2021-04-23 19:14:02 -04:00 committed by Skia Commit-Bot
parent 18607b442c
commit 0bc48228ae
3 changed files with 67 additions and 13 deletions
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69
tools/viewer/MSKPSlide.cpp
View File

@ -9,7 +9,9 @@
#include "include/core/SkCanvas.h"
#include "include/core/SkStream.h"
#include "include/private/SkTPin.h"
#include "src/core/SkOSFile.h"
#include "imgui.h"
MSKPSlide::MSKPSlide(const SkString& name, const SkString& path)
: MSKPSlide(name, SkStream::MakeFromFile(path.c_str())) {}
@ -24,15 +26,71 @@ SkISize MSKPSlide::getDimensions() const {
}
void MSKPSlide::draw(SkCanvas* canvas) {
if (fPlayer) {
fPlayer->playFrame(canvas, fFrame);
if (!fPlayer) {
ImGui::Text("Could not read mskp file %s.\n", fName.c_str());
return;
}
ImGui::Begin("MSKP");
ImGui::BeginGroup();
// Play/Pause button
if (ImGui::Button(fPaused ? "Play " : "Pause")) {
fPaused = !fPaused;
if (fPaused) {
// This will ensure that when playback is unpaused we start on the current frame.
fLastFrameTime = -1;
}
}
// Control the frame rate of MSKP playback
ImGui::Text("FPS: "); ImGui::SameLine();
ImGui::RadioButton( "1", &fFPS, 1); ImGui::SameLine();
ImGui::RadioButton( "15", &fFPS, 15); ImGui::SameLine();
ImGui::RadioButton( "30", &fFPS, 30); ImGui::SameLine();
ImGui::RadioButton( "60", &fFPS, 60); ImGui::SameLine();
ImGui::RadioButton("120", &fFPS, 120); ImGui::SameLine();
ImGui::RadioButton("1:1", &fFPS, -1); // Draw one MSKP frame for each real viewer frame.
if (fFPS < 0) {
// Like above, will cause onAnimate() to resume at current frame when FPS is changed
// back to another frame rate.
fLastFrameTime = -1;
}
// Frame control. Slider and +/- buttons. Ctrl-Click slider to type frame number.
ImGui::Text("Frame:");
ImGui::SameLine();
ImGui::PushButtonRepeat(true); // Enable click-and-hold for frame arrows.
if (ImGui::ArrowButton("-mksp_frame", ImGuiDir_Left)) {
fFrame = (fFrame + fPlayer->numFrames() - 1)%fPlayer->numFrames();
}
ImGui::SameLine();
if (ImGui::SliderInt("##msk_frameslider", &fFrame, 0, fPlayer->numFrames()-1, "% 3d")) {
fFrame = SkTPin(fFrame, 0, fPlayer->numFrames() - 1);
}
ImGui::SameLine();
if (ImGui::ArrowButton("+mskp_frame", ImGuiDir_Right)) {
fFrame = (fFrame + 1)%fPlayer->numFrames();
}
ImGui::PopButtonRepeat();
fPlayer->playFrame(canvas, fFrame);
ImGui::EndGroup();
ImGui::End();
}
bool MSKPSlide::animate(double nanos) {
if (!fPlayer) {
if (!fPlayer || fPaused) {
return false;
}
if (fLastFrameTime < 0) {
// We're coming off being paused or switching from 1:1 mode to steady FPS. Advance 1 frame
// and reset the frame time to start accumulating time from now.
fFrame = (fFrame + 1)%fPlayer->numFrames();
fLastFrameTime = nanos;
return this->fPlayer->numFrames() > 1;
}
if (fFPS < 0) {
// 1:1 mode. Always draw the next frame on each animation cycle.
fFrame = (fFrame + 1)%fPlayer->numFrames();
return this->fPlayer->numFrames() > 1;
}
double elapsed = nanos - fLastFrameTime;
double frameTime = 1E9/fFPS;
int framesToAdvance = elapsed/frameTime;
@ -44,15 +102,10 @@ bool MSKPSlide::animate(double nanos) {
void MSKPSlide::load(SkScalar, SkScalar) {
if (!fStream) {
SkDebugf("No skp stream for slide %s.\n", fName.c_str());
return;
}
fStream->rewind();
fPlayer = MSKPPlayer::Make(fStream.get());
if (!fPlayer) {
SkDebugf("Could parse MSKP from stream for slide %s.\n", fName.c_str());
return;
}
}
void MSKPSlide::unload() { fPlayer.reset(); }

10
tools/viewer/MSKPSlide.h
View File

@ -28,10 +28,12 @@ public:
private:
std::unique_ptr<SkStreamSeekable> fStream;
std::unique_ptr<MSKPPlayer> fPlayer;
int fFrame = 0;
int fFPS = 15; // TODO: make this adjustable. This happens to work well for calendar.mskp
double fLastFrameTime = 0;
std::unique_ptr<MSKPPlayer> fPlayer;
int fFrame = 0;
int fFPS = 15;
bool fPaused = false;
double fLastFrameTime = -1;
using INHERITED = Slide;
};

1
tools/viewer/Slide.h
View File

@ -36,7 +36,6 @@ public:
const SkString& getName() { return fName; }
protected:
SkString fName;
};