Start of cross process SkScalerContext.

Change-Id: I16d9293cbc0bef1bdce1260d1bd9b43d8853d070
Reviewed-on: https://skia-review.googlesource.com/93641
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Herb Derby <herb@google.com>

1 files changed, 375 insertions, 0 deletions

diff --git a/tools/remote_demo.cpp b/tools/remote_demo.cpp
new file mode 100644
index 0000000000..fbc2480278
--- /dev/null
+++ b/tools/remote_demo.cpp
@@ -0,0 +1,375 @@
+/*
+ * 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 "SkPathEffect.h"
+#include "SkMaskFilter.h"
+#include "SkData.h"
+#include "SkDescriptor.h"
+#include "SkGraphics.h"
+#include "SkSemaphore.h"
+#include "SkPictureRecorder.h"
+#include "SkSerialProcs.h"
+#include "SkSurface.h"
+#include "SkTypeface.h"
+#include "SkWriteBuffer.h"
+
+#include <ctype.h>
+#include <err.h>
+#include <memory>
+#include <stdio.h>
+#include <thread>
+#include <iostream>
+#include <unordered_map>
+
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+#include <sys/mman.h>
+#include "SkTypeface_remote.h"
+
+static const size_t kPageSize = 4096;
+
+struct WireTypeface {
+    std::thread::id thread_id;
+    SkFontID        typeface_id;
+    SkFontStyle     style;
+    bool            is_fixed;
+};
+
+class Op {
+public:
+    Op() {}
+    int32_t op;
+    SkFontID typeface_id;
+    union {
+        // op 0
+        SkPaint::FontMetrics fontMetrics;
+        // op 1 and 2
+        SkGlyph glyph;
+        // op 3
+        struct {
+            SkGlyphID glyphId;
+            size_t pathSize;
+        };
+    };
+    // The system only passes descriptors without effects. That is why it uses a fixed size
+    // descriptor. storageFor is needed because some of the constructors below are private.
+    template <typename T>
+    using storageFor = typename std::aligned_storage<sizeof(T), alignof(T)>::type;
+    struct {
+        storageFor<SkDescriptor>        dummy1;
+        storageFor<SkDescriptor::Entry> dummy2;
+        storageFor<SkScalerContextRec>  dummy3;
+    } descriptor;
+};
+
+class RemoteScalerContextPassThread : public SkRemoteScalerContext {
+public:
+    explicit RemoteScalerContextPassThread(int readFd, int writeFd)
+        : fReadFd{readFd}
+        , fWriteFd{writeFd} { }
+    void generateFontMetrics(const SkTypefaceProxy& tf,
+                             const SkScalerContextRec& rec,
+                             SkPaint::FontMetrics* metrics) override {
+        Op* op = this->createOp(0, tf, rec);
+        write(fWriteFd, fBuffer, sizeof(*op));
+        ssize_t readSize = read(fReadFd, fBuffer, sizeof(fBuffer));
+        std::cerr << "gpu - op 0 read size: " << readSize << std::endl;
+        memcpy(metrics, &op->fontMetrics, sizeof(op->fontMetrics));
+        op->~Op();
+    }
+
+    void generateMetrics(const SkTypefaceProxy& tf,
+                         const SkScalerContextRec& rec,
+                         SkGlyph* glyph) override {
+        Op* op = this->createOp(1, tf, rec);
+        memcpy(&op->glyph, glyph, sizeof(*glyph));
+        write(fWriteFd, fBuffer, sizeof(*op));
+        read(fReadFd, fBuffer, sizeof(fBuffer));
+        memcpy(glyph, &op->glyph, sizeof(op->glyph));
+        op->~Op();
+    }
+
+    void generateImage(const SkTypefaceProxy& tf,
+                       const SkScalerContextRec& rec,
+                       const SkGlyph& glyph) override {
+        Op* op = this->createOp(2, tf, rec);
+        memcpy(&op->glyph, &glyph, sizeof(glyph));
+        write(fWriteFd, fBuffer, sizeof(*op));
+        read(fReadFd, fBuffer, sizeof(fBuffer));
+        //memcpy((SkGlyph *)&glyph, &op->glyph, sizeof(op->glyph));
+        //((SkGlyph*)&glyph)->fImage = oldImage;
+        std::cerr << "rb: " << glyph.rowBytes() << " h: " << glyph.fHeight << std::endl;
+        memcpy(glyph.fImage, fBuffer + sizeof(Op), glyph.rowBytes() * glyph.fHeight);
+        op->~Op();
+    }
+
+    void generatePath(const SkTypefaceProxy& tf,
+                      const SkScalerContextRec& rec,
+                      SkGlyphID glyph, SkPath* path) override {
+        Op* op = this->createOp(3, tf, rec);
+        op->glyphId = glyph;
+        write(fWriteFd, fBuffer, sizeof(*op));
+        read(fReadFd, fBuffer, sizeof(fBuffer));
+        path->readFromMemory(fBuffer + sizeof(Op), op->pathSize);
+        op->~Op();
+    }
+
+private:
+    Op* createOp(uint32_t opID, const SkTypefaceProxy& tf,
+                 const SkScalerContextRec& rec) {
+        Op* op = new (fBuffer) Op();
+        op->op = opID;
+        op->typeface_id = tf.fontID();
+
+        SkASSERT(SkScalerContext::CheckBufferSizeForRec(
+            rec, SkScalerContextEffects{}, sizeof(op->descriptor)));
+
+        SkScalerContext::DescriptorBufferGiveRec(rec, &op->descriptor);
+
+        return op;
+    }
+
+    const int fReadFd,
+              fWriteFd;
+    uint8_t   fBuffer[1024 * kPageSize];
+};
+
+static sk_sp<SkTypeface> gpu_from_renderer_by_ID(const void* buf, size_t len, void* ctx) {
+    WireTypeface wire;
+    std::cerr << "gpu - typeface from rendere size: " << len << std::endl;
+    if (len >= sizeof(wire)) {
+        memcpy(&wire, buf, sizeof(wire));
+        std::cerr << wire.thread_id << "  " << wire.typeface_id << std::endl;
+        return sk_sp<SkTypeface>(
+                new SkTypefaceProxy(
+                        wire.typeface_id,
+                        wire.thread_id,
+                        wire.style,
+                        wire.is_fixed,
+                        (SkRemoteScalerContext*) ctx));
+    }
+    return nullptr;
+}
+
+std::unordered_map<SkFontID, sk_sp<SkTypeface>> gTypefaceMap;
+
+
+static std::unique_ptr<SkScalerContext> scaler_context_from_op(Op* op) {
+
+    auto i = gTypefaceMap.find(op->typeface_id);
+    if (i == gTypefaceMap.end()) {
+        std::cerr << "bad typeface id: " <<  op->typeface_id << std::endl;
+        SK_ABORT("unknown type face");
+    }
+    auto tf = i->second;
+    std::cerr << "ops - got typeface: " << i->first << " , " << tf.get() << std::endl;
+    SkScalerContextEffects effects;
+    auto sc = tf->createScalerContext(effects, (SkDescriptor *)&op->descriptor, false);
+    std::cerr << "ops - created sc " << std::endl;
+    return sc;
+
+}
+
+static sk_sp<SkData> renderer_to_gpu_by_ID(SkTypeface* tf, void* ctx) {
+    WireTypeface wire = {
+            std::this_thread::get_id(),
+            SkTypeface::UniqueID(tf),
+            tf->fontStyle(),
+            tf->isFixedPitch()
+    };
+    auto i = gTypefaceMap.find(SkTypeface::UniqueID(tf));
+    if (i == gTypefaceMap.end()) {
+        std::cerr << "font id table - inserting: " << SkTypeface::UniqueID(tf) << std::endl;
+        gTypefaceMap.insert({SkTypeface::UniqueID(tf), sk_ref_sp(tf)});
+    }
+    return SkData::MakeWithCopy(&wire, sizeof(wire));
+}
+
+static void gpu(int readFd, int writeFd) {
+
+    size_t picSize = 0;
+    read(readFd, &picSize, sizeof(picSize));
+
+    std::cerr << "gpu - reading pic size: " << picSize << std::endl;
+    static constexpr size_t kBufferSize = 10 * 1024 * kPageSize;
+    std::unique_ptr<uint8_t[]> picBuffer{new uint8_t[kBufferSize]};
+
+    size_t readSoFar = 0;
+    while (readSoFar < picSize) {
+        ssize_t readSize;
+        if((readSize = read(readFd, &picBuffer[readSoFar], kBufferSize - readSoFar)) <= 0) {
+            if (readSize == 0) return;
+            err(1, "gpu pic read error %d", errno);
+        }
+        readSoFar += readSize;
+        //std::cerr << "gpu - recieved so far: " << readSoFar << std::endl;
+    }
+
+    std::cerr << "gpu - Receiving picture" << std::endl;
+    SkDeserialProcs procs;
+    std::unique_ptr<SkRemoteScalerContext> rsc{
+            new RemoteScalerContextPassThread{readFd, writeFd}};
+    procs.fTypefaceProc = gpu_from_renderer_by_ID;
+    procs.fTypefaceCtx = rsc.get();
+    auto pic = SkPicture::MakeFromData(picBuffer.get(), picSize, &procs);
+
+    auto cullRect = pic->cullRect();
+    auto r = cullRect.round();
+    auto s = SkSurface::MakeRasterN32Premul(r.width(), r.height());
+
+    auto c = s->getCanvas();
+    c->drawPicture(pic);
+
+    std::cerr << "gpu - output picture" << std::endl;
+    auto i = s->makeImageSnapshot();
+    auto data = i->encodeToData();
+    SkFILEWStream f("test.png");
+    f.write(data->data(), data->size());
+    close(writeFd);
+    close(readFd);
+
+}
+
+static int renderer(const std::string& skpName, int readFd, int writeFd) {
+    std::string prefix{"skps/"};
+    std::string fileName{prefix + skpName + ".skp"};
+    std::cerr << "Reading skp: " << fileName << std::endl;
+
+    auto skp = SkData::MakeFromFileName(fileName.c_str());
+    auto pic = SkPicture::MakeFromData(skp.get());
+
+    SkSerialProcs procs;
+    procs.fTypefaceProc = renderer_to_gpu_by_ID;
+    auto stream = pic->serialize(&procs);
+
+    std::cerr << "stream is " << stream->size() << " bytes long" << std::endl;
+
+    std::cerr << "render - Sending stream." << std::endl;
+
+    size_t picSize = stream->size();
+    uint8_t* picBuffer = (uint8_t*) stream->data();
+    write(writeFd, &picSize, sizeof(picSize));
+
+    size_t writeSoFar = 0;
+    while (writeSoFar < picSize) {
+        ssize_t writeSize = write(writeFd, &picBuffer[writeSoFar], picSize - writeSoFar);
+        std::cerr << "renderer - bytes written: " << writeSize << std::endl;
+        if (writeSize <= 0) {
+            if (writeSize == 0) {
+                std::cerr << "Exit" << std::endl;
+                return 1;
+            }
+            perror("Can't write picture from render to GPU ");
+            return 1;
+        }
+        writeSoFar += writeSize;
+    }
+    std::cerr << "Waiting for scaler context ops." << std::endl;
+
+    static constexpr size_t kBufferSize = 1024 * kPageSize;
+    std::unique_ptr<uint8_t[]> glyphBuffer{new uint8_t[kBufferSize]};
+
+    Op* op = (Op*)glyphBuffer.get();
+    while (true) {
+        ssize_t size = read(readFd, glyphBuffer.get(), sizeof(*op));
+        if (size <= 0) { std::cerr << "Exit op loop" << std::endl; break;}
+        size_t writeSize = sizeof(*op);
+        std::cerr << "op: " << op << " op->op: " << op->op << std::endl;
+
+            auto sc = scaler_context_from_op(op);
+            switch (op->op) {
+                case 0: {
+                    sc->getFontMetrics(&op->fontMetrics);
+                    break;
+                }
+                case 1: {
+                    sc->getMetrics(&op->glyph);
+                    break;
+                }
+                case 2: {
+                    // TODO: check for buffer overflow.
+                    op->glyph.fImage = &glyphBuffer[sizeof(Op)];
+                    sc->getImage(op->glyph);
+                    writeSize += op->glyph.rowBytes() * op->glyph.fHeight;
+                    break;
+                }
+                case 3: {
+                    // TODO: check for buffer overflow.
+                    SkPath path;
+                    sc->getPath(op->glyphId, &path);
+                    op->pathSize = path.writeToMemory(&glyphBuffer[sizeof(Op)]);
+                    writeSize += op->pathSize;
+                    break;
+                }
+                default:
+                    SkASSERT("Bad op");
+            }
+        std::cerr << "ops - writing" << std::endl;
+        ssize_t written = write(writeFd, glyphBuffer.get(), writeSize);
+        std::cerr << " opss - writing : " << writeSize << " written: " << written << std::endl;
+    }
+
+    close(readFd);
+    close(writeFd);
+
+    std::cerr << "Returning from render" << std::endl;
+
+    return 0;
+}
+
+int main(int argc, char** argv) {
+    std::string skpName = argc > 1 ? std::string{argv[1]} : std::string{"desk_nytimes"};
+    printf("skp: %s\n", skpName.c_str());
+
+    int render_to_gpu[2],
+        gpu_to_render[2];
+
+    enum direction : int {kRead = 0, kWrite = 1};
+
+    int r = pipe(render_to_gpu);
+    if (r < 0) {
+        perror("Can't write picture from render to GPU ");
+        return 1;
+    }
+    r = pipe(gpu_to_render);
+    if (r < 0) {
+        perror("Can't write picture from render to GPU ");
+        return 1;
+    }
+
+    pid_t child = fork();
+    SkGraphics::Init();
+
+    if (child == 0) {
+        // The child - renderer
+        // Close unused pipe ends.
+        close(render_to_gpu[kRead]);
+        close(gpu_to_render[kWrite]);
+        std::cerr << "Starting renderer" << std::endl;
+        printf("skp: %s\n", skpName.c_str());
+        renderer(skpName, gpu_to_render[kRead], render_to_gpu[kWrite]);
+        //gpu(gpu_to_render[kRead], render_to_gpu[kWrite]);
+    } else {
+        // The parent - GPU
+        // Close unused pipe ends.
+        std::cerr << "child id - " << child << std::endl;
+        close(gpu_to_render[kRead]);
+        close(render_to_gpu[kWrite]);
+        gpu(render_to_gpu[kRead], gpu_to_render[kWrite]);
+        //renderer(skpName, render_to_gpu[kRead], gpu_to_render[kWrite]);
+
+
+        std::cerr << "Waiting for renderer." << std::endl;
+        waitpid(child, nullptr, 0);
+    }
+
+
+    return 0;
+}
+