blob: 19084c43f6b5dbd62dba3bd4eab554de9cc06f99 [file] [log] [blame]
/*
* Copyright 2019 Google LLC
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "include/core/SkPicture.h"
#include "include/core/SkSurface.h"
#include "src/utils/SkJSONWriter.h"
#include "src/utils/SkMultiPictureDocument.h"
#include "tools/SkSharingProc.h"
#include "tools/UrlDataManager.h"
#include "tools/debugger/DebugCanvas.h"
#include <emscripten.h>
#include <emscripten/bind.h>
#if SK_SUPPORT_GPU
#include "include/gpu/GrBackendSurface.h"
#include "include/gpu/GrContext.h"
#include "include/gpu/gl/GrGLInterface.h"
#include "include/gpu/gl/GrGLTypes.h"
#include <GL/gl.h>
#include <emscripten/html5.h>
#endif
using JSColor = int32_t;
// file signature for SkMultiPictureDocument
// TODO(nifong): make public and include from SkMultiPictureDocument.h
static constexpr char kMultiMagic[] = "Skia Multi-Picture Doc\n\n";
struct SimpleImageInfo {
int width;
int height;
SkColorType colorType;
SkAlphaType alphaType;
};
SkImageInfo toSkImageInfo(const SimpleImageInfo& sii) {
return SkImageInfo::Make(sii.width, sii.height, sii.colorType, sii.alphaType);
}
class SkpDebugPlayer {
public:
SkpDebugPlayer() {}
/* loadSkp deserializes a skp file that has been copied into the shared WASM memory.
* cptr - a pointer to the data to deserialize.
* length - length of the data in bytes.
* The caller must allocate the memory with M._malloc where M is the wasm module in javascript
* and copy the data into M.buffer at the pointer returned by malloc.
*
* uintptr_t is used here because emscripten will not allow binding of functions with pointers
* to primitive types. We can instead pass a number and cast it to whatever kind of
* pointer we're expecting.
*/
void loadSkp(uintptr_t cptr, int length) {
const uint8_t* data = reinterpret_cast<const uint8_t*>(cptr);
char magic[8];
// Both traditional and multi-frame skp files have a magic word
SkMemoryStream stream(data, length);
SkDebugf("make stream at %p, with %d bytes\n",data, length);
// Why -1? I think it's got to do with using a constexpr, just a guess.
const size_t magicsize = sizeof(kMultiMagic) - 1;
if (memcmp(data, kMultiMagic, magicsize) == 0) {
SkDebugf("Try reading as a multi-frame skp\n");
loadMultiFrame(&stream);
} else {
SkDebugf("Try reading as single-frame skp\n");
frames.push_back(loadSingleFrame(&stream));
}
}
/* drawTo asks the debug canvas to draw from the beginning of the picture
* to the given command and flush the canvas.
*/
void drawTo(SkSurface* surface, int32_t index) {
int cmdlen = frames[fp]->getSize();
if (cmdlen == 0) {
SkDebugf("Zero commands to execute");
return;
}
if (index >= cmdlen) {
SkDebugf("Constrained command index (%d) within this frame's length (%d)\n", index, cmdlen);
index = cmdlen-1;
}
frames[fp]->drawTo(surface->getCanvas(), index);
surface->getCanvas()->flush();
}
const SkIRect& getBounds() { return fBounds; }
void setOverdrawVis(bool on) {
frames[fp]->setOverdrawViz(on);
}
void setGpuOpBounds(bool on) {
frames[fp]->setDrawGpuOpBounds(on);
}
void setClipVizColor(JSColor color) {
frames[fp]->setClipVizColor(SkColor(color));
}
void deleteCommand(int index) {
frames[fp]->deleteDrawCommandAt(index);
}
void setCommandVisibility(int index, bool visible) {
frames[fp]->toggleCommand(index, visible);
}
int getSize() const {
return frames[fp]->getSize();
}
int getFrameCount() const {
return frames.size();
}
// Return the command list in JSON representation as a string
std::string jsonCommandList(sk_sp<SkSurface> surface) {
SkDynamicMemoryWStream stream;
SkJSONWriter writer(&stream, SkJSONWriter::Mode::kFast);
// Note that the root url provided here may need to change in the production deployment.
// this will be prepended to any links that are created in the json command list.
UrlDataManager udm(SkString("/"));
writer.beginObject(); // root
frames[fp]->toJSON(writer, udm, getSize(), surface->getCanvas());
writer.endObject(); // root
writer.flush();
auto skdata = stream.detachAsData();
// Convert skdata to string_view, which accepts a length
std::string_view data_view(reinterpret_cast<const char*>(skdata->data()), skdata->size());
// and string_view to string, which emscripten understands.
return std::string(data_view);
}
// Gets the clip and matrix of the last command drawn
std::string lastCommandInfo() {
SkMatrix vm = frames[fp]->getCurrentMatrix();
SkIRect clip = frames[fp]->getCurrentClip();
SkDynamicMemoryWStream stream;
SkJSONWriter writer(&stream, SkJSONWriter::Mode::kFast);
UrlDataManager udm(SkString("/"));
writer.beginObject(); // root
writer.appendName("ViewMatrix");
DrawCommand::MakeJsonMatrix(writer, vm);
writer.appendName("ClipRect");
DrawCommand::MakeJsonIRect(writer, clip);
writer.endObject(); // root
writer.flush();
auto skdata = stream.detachAsData();
// Convert skdata to string_view, which accepts a length
std::string_view data_view(reinterpret_cast<const char*>(skdata->data()), skdata->size());
// and string_view to string, which emscripten understands.
return std::string(data_view);
}
void changeFrame(int index) {
fp = index;
}
private:
// Loads a single frame (traditional) skp file from the provided data stream and returns
// a newly allocated DebugCanvas initialized with the SkPicture that was in the file.
std::unique_ptr<DebugCanvas> loadSingleFrame(SkMemoryStream* stream) {
// note overloaded = operator that actually does a move
sk_sp<SkPicture> picture = SkPicture::MakeFromStream(stream);
if (!picture) {
SkDebugf("Unable to deserialze frame.\n");
return nullptr;
}
SkDebugf("Parsed SKP file.\n");
// Make debug canvas using bounds from SkPicture
fBounds = picture->cullRect().roundOut();
std::unique_ptr<DebugCanvas> debugDanvas = std::make_unique<DebugCanvas>(fBounds);
SkDebugf("DebugCanvas created.\n");
// Only draw picture to the debug canvas once.
debugDanvas->drawPicture(picture);
SkDebugf("Added picture with %d commands.\n", debugDanvas->getSize());
return debugDanvas;
}
void loadMultiFrame(SkMemoryStream* stream) {
// Attempt to deserialize with an image sharing serial proc.
auto deserialContext = std::make_unique<SkSharingDeserialContext>();
SkDeserialProcs procs;
procs.fImageProc = SkSharingDeserialContext::deserializeImage;
procs.fImageCtx = deserialContext.get();
int page_count = SkMultiPictureDocumentReadPageCount(stream);
if (!page_count) {
SkDebugf("Not a MultiPictureDocument");
return;
}
SkDebugf("Expecting %d frames\n", page_count);
std::vector<SkDocumentPage> pages(page_count);
if (!SkMultiPictureDocumentRead(stream, pages.data(), page_count, &procs)) {
SkDebugf("Reading frames from MultiPictureDocument failed");
return;
}
for (const auto& page : pages) {
// Make debug canvas using bounds from SkPicture
fBounds = page.fPicture->cullRect().roundOut();
std::unique_ptr<DebugCanvas> debugDanvas = std::make_unique<DebugCanvas>(fBounds);
// Only draw picture to the debug canvas once.
debugDanvas->drawPicture(page.fPicture);
SkDebugf("Added picture with %d commands.\n", debugDanvas->getSize());
if (debugDanvas->getSize() <=0 ){
SkDebugf("Skipped corrupted frame, had %d commands \n", debugDanvas->getSize());
continue;
}
debugDanvas->setOverdrawViz(false);
debugDanvas->setDrawGpuOpBounds(false);
debugDanvas->setClipVizColor(SK_ColorTRANSPARENT);
frames.push_back(std::move(debugDanvas));
}
}
// A vector of DebugCanvas, each one initialized to a frame of the animation.
std::vector<std::unique_ptr<DebugCanvas>> frames;
// The index of the current frame (into the vector above)
int fp = 0;
// The width and height of the animation. (in practice the bounds of the last loaded frame)
SkIRect fBounds;
// SKP version of loaded file.
uint32_t fFileVersion;
};
#if SK_SUPPORT_GPU
sk_sp<GrContext> MakeGrContext(EMSCRIPTEN_WEBGL_CONTEXT_HANDLE context)
{
EMSCRIPTEN_RESULT r = emscripten_webgl_make_context_current(context);
if (r < 0) {
SkDebugf("failed to make webgl context current %d\n", r);
return nullptr;
}
// setup GrContext
auto interface = GrGLMakeNativeInterface();
// setup contexts
sk_sp<GrContext> grContext(GrContext::MakeGL(interface));
return grContext;
}
sk_sp<SkSurface> MakeOnScreenGLSurface(sk_sp<GrContext> grContext, int width, int height) {
glClearColor(0, 0, 0, 0);
glClearStencil(0);
glClear(GL_COLOR_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
// Wrap the frame buffer object attached to the screen in a Skia render
// target so Skia can render to it
GrGLint buffer;
glGetIntegerv(GL_FRAMEBUFFER_BINDING, &buffer);
GrGLFramebufferInfo info;
info.fFBOID = (GrGLuint) buffer;
SkColorType colorType;
info.fFormat = GL_RGBA8;
colorType = kRGBA_8888_SkColorType;
GrBackendRenderTarget target(width, height, 0, 8, info);
sk_sp<SkSurface> surface(SkSurface::MakeFromBackendRenderTarget(grContext.get(), target,
kBottomLeft_GrSurfaceOrigin,
colorType, nullptr, nullptr));
return surface;
}
sk_sp<SkSurface> MakeRenderTarget(sk_sp<GrContext> grContext, int width, int height) {
SkImageInfo info = SkImageInfo::MakeN32(width, height, SkAlphaType::kPremul_SkAlphaType);
sk_sp<SkSurface> surface(SkSurface::MakeRenderTarget(grContext.get(),
SkBudgeted::kYes,
info, 0,
kBottomLeft_GrSurfaceOrigin,
nullptr, true));
return surface;
}
sk_sp<SkSurface> MakeRenderTarget(sk_sp<GrContext> grContext, SimpleImageInfo sii) {
sk_sp<SkSurface> surface(SkSurface::MakeRenderTarget(grContext.get(),
SkBudgeted::kYes,
toSkImageInfo(sii), 0,
kBottomLeft_GrSurfaceOrigin,
nullptr, true));
return surface;
}
#endif
using namespace emscripten;
EMSCRIPTEN_BINDINGS(my_module) {
// The main class that the JavaScript in index.html uses
class_<SkpDebugPlayer>("SkpDebugPlayer")
.constructor<>()
.function("loadSkp", &SkpDebugPlayer::loadSkp, allow_raw_pointers())
.function("drawTo", &SkpDebugPlayer::drawTo, allow_raw_pointers())
.function("getBounds", &SkpDebugPlayer::getBounds)
.function("setOverdrawVis", &SkpDebugPlayer::setOverdrawVis)
.function("setClipVizColor", &SkpDebugPlayer::setClipVizColor)
.function("getSize", &SkpDebugPlayer::getSize)
.function("deleteCommand", &SkpDebugPlayer::deleteCommand)
.function("setCommandVisibility", &SkpDebugPlayer::setCommandVisibility)
.function("setGpuOpBounds", &SkpDebugPlayer::setGpuOpBounds)
.function("jsonCommandList", &SkpDebugPlayer::jsonCommandList, allow_raw_pointers())
.function("lastCommandInfo", &SkpDebugPlayer::lastCommandInfo)
.function("changeFrame", &SkpDebugPlayer::changeFrame)
.function("getFrameCount", &SkpDebugPlayer::getFrameCount);
// Structs used as arguments or returns to the functions above
value_object<SkIRect>("SkIRect")
.field("fLeft", &SkIRect::fLeft)
.field("fTop", &SkIRect::fTop)
.field("fRight", &SkIRect::fRight)
.field("fBottom", &SkIRect::fBottom);
// Symbols needed by cpu.js to perform surface creation and flushing.
enum_<SkColorType>("ColorType")
.value("RGBA_8888", SkColorType::kRGBA_8888_SkColorType);
enum_<SkAlphaType>("AlphaType")
.value("Opaque", SkAlphaType::kOpaque_SkAlphaType)
.value("Premul", SkAlphaType::kPremul_SkAlphaType)
.value("Unpremul", SkAlphaType::kUnpremul_SkAlphaType);
value_object<SimpleImageInfo>("SkImageInfo")
.field("width", &SimpleImageInfo::width)
.field("height", &SimpleImageInfo::height)
.field("colorType", &SimpleImageInfo::colorType)
.field("alphaType", &SimpleImageInfo::alphaType);
constant("TRANSPARENT", (JSColor) SK_ColorTRANSPARENT);
function("_getRasterDirectSurface", optional_override([](const SimpleImageInfo ii,
uintptr_t /* uint8_t* */ pPtr,
size_t rowBytes)->sk_sp<SkSurface> {
uint8_t* pixels = reinterpret_cast<uint8_t*>(pPtr);
SkImageInfo imageInfo = toSkImageInfo(ii);
SkDebugf("Made raster direct surface.\n");
return SkSurface::MakeRasterDirect(imageInfo, pixels, rowBytes, nullptr);
}), allow_raw_pointers());
class_<SkSurface>("SkSurface")
.smart_ptr<sk_sp<SkSurface>>("sk_sp<SkSurface>")
.function("width", &SkSurface::width)
.function("height", &SkSurface::height)
.function("_flush", select_overload<void()>(&SkSurface::flush))
.function("getCanvas", &SkSurface::getCanvas, allow_raw_pointers());
class_<SkCanvas>("SkCanvas")
.function("clear", optional_override([](SkCanvas& self, JSColor color)->void {
// JS side gives us a signed int instead of an unsigned int for color
// Add a optional_override to change it out.
self.clear(SkColor(color));
}));
#if SK_SUPPORT_GPU
class_<GrContext>("GrContext")
.smart_ptr<sk_sp<GrContext>>("sk_sp<GrContext>");
function("currentContext", &emscripten_webgl_get_current_context);
function("setCurrentContext", &emscripten_webgl_make_context_current);
function("MakeGrContext", &MakeGrContext);
function("MakeOnScreenGLSurface", &MakeOnScreenGLSurface);
function("MakeRenderTarget", select_overload<sk_sp<SkSurface>(
sk_sp<GrContext>, int, int)>(&MakeRenderTarget));
function("MakeRenderTarget", select_overload<sk_sp<SkSurface>(
sk_sp<GrContext>, SimpleImageInfo)>(&MakeRenderTarget));
constant("gpu", true);
#endif
}