Revert of Initial support for turning Skia draws into a JSON document and vice versa.

src/json/SkJSONRenderer.cpp

-/*
- * 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 "SkJSONRenderer.h"
-#include "SkJSONCanvas.h"
-#include "SkJSONCPP.h"
-#include "SkPath.h"
-
-namespace SkJSONRenderer {
-
-class Renderer {
-public:
-    void getPaint(Json::Value& command, SkPaint* paint);
-
-    void getRect(Json::Value& command, const char* name, SkRect* rect);
-
-    void getRRect(Json::Value& command, const char* name, SkRRect* rrect);
-
-    void processCommand(Json::Value& command, SkCanvas* target);
-
-    void processMatrix(Json::Value& command, SkCanvas* target);
-
-    void processSave(Json::Value& command, SkCanvas* target);
-
-    void processRestore(Json::Value& command, SkCanvas* target);
-
-    void processPaint(Json::Value& command, SkCanvas* target);
-
-    void processRect(Json::Value& command, SkCanvas* target);
-
-    void processRRect(Json::Value& command, SkCanvas* target);
-
-    void processOval(Json::Value& command, SkCanvas* target);
-
-    void processPath(Json::Value& command, SkCanvas* target);
-
-    void processText(Json::Value& command, SkCanvas* target);
-
-    void processPoints(Json::Value& command, SkCanvas* target);
-
-    void processClipRect(Json::Value& command, SkCanvas* target);
-};
-
-void Renderer::processCommand(Json::Value& command, SkCanvas* target) {
-    const char* name = command[SKJSONCANVAS_COMMAND].asCString();
-    // TODO speed this up with a hash
-    if (!strcmp(name, SKJSONCANVAS_COMMAND_MATRIX)) {
-        this->processMatrix(command, target);
-    }
-    else if (!strcmp(name, SKJSONCANVAS_COMMAND_SAVE)) {
-        this->processSave(command, target);
-    }
-    else if (!strcmp(name, SKJSONCANVAS_COMMAND_RESTORE)) {
-        this->processRestore(command, target);
-    }
-    else if (!strcmp(name, SKJSONCANVAS_COMMAND_PAINT)) {
-        this->processPaint(command, target);
-    }
-    else if (!strcmp(name, SKJSONCANVAS_COMMAND_RECT)) {
-        this->processRect(command, target);
-    }
-    else if (!strcmp(name, SKJSONCANVAS_COMMAND_RRECT)) {
-        this->processRRect(command, target);
-    }
-    else if (!strcmp(name, SKJSONCANVAS_COMMAND_OVAL)) {
-        this->processOval(command, target);
-    }
-    else if (!strcmp(name, SKJSONCANVAS_COMMAND_PATH)) {
-        this->processPath(command, target);
-    }
-    else if (!strcmp(name, SKJSONCANVAS_COMMAND_TEXT)) {
-        this->processText(command, target);
-    }
-    else if (!strcmp(name, SKJSONCANVAS_COMMAND_POINTS)) {
-        this->processPoints(command, target);
-    }
-    else if (!strcmp(name, SKJSONCANVAS_COMMAND_CLIPRECT)) {
-        this->processClipRect(command, target);
-    }
-    else {
-        SkDebugf("unsupported JSON command: %s\n", name);
-    }
-}
-
-void Renderer::getPaint(Json::Value& command, SkPaint* result) {
-    Json::Value jsonPaint = command[SKJSONCANVAS_ATTRIBUTE_PAINT];
-    if (jsonPaint.isMember(SKJSONCANVAS_ATTRIBUTE_COLOR)) {
-        Json::Value color = jsonPaint[SKJSONCANVAS_ATTRIBUTE_COLOR];
-        result->setColor(SkColorSetARGB(color[0].asInt(), color[1].asInt(), color[2].asInt(),
-                         color[3].asInt()));
-    }
-    if (jsonPaint.isMember(SKJSONCANVAS_ATTRIBUTE_STYLE)) {
-        const char* style = jsonPaint[SKJSONCANVAS_ATTRIBUTE_STYLE].asCString();
-        if (!strcmp(style, SKJSONCANVAS_STYLE_FILL)) {
-            result->setStyle(SkPaint::kFill_Style);
-        }
-        else if (!strcmp(style, SKJSONCANVAS_STYLE_STROKE)) {
-            result->setStyle(SkPaint::kStroke_Style);
-        }
-        else if (!strcmp(style, SKJSONCANVAS_STYLE_STROKEANDFILL)) {
-            result->setStyle(SkPaint::kStrokeAndFill_Style);
-        }
-    }
-    if (jsonPaint.isMember(SKJSONCANVAS_ATTRIBUTE_STROKEWIDTH)) {
-        float strokeWidth = jsonPaint[SKJSONCANVAS_ATTRIBUTE_STROKEWIDTH].asFloat();
-        result->setStrokeWidth(strokeWidth);
-    }
-    if (jsonPaint.isMember(SKJSONCANVAS_ATTRIBUTE_ANTIALIAS)) {
-        result->setAntiAlias(jsonPaint[SKJSONCANVAS_ATTRIBUTE_ANTIALIAS].asBool());
-    }
-}
-
-void Renderer::getRect(Json::Value& command, const char* name, SkRect* result) {
-    Json::Value rect = command[name];
-    result->set(rect[0].asFloat(), rect[1].asFloat(), rect[2].asFloat(), rect[3].asFloat());
-}
-
-void Renderer::getRRect(Json::Value& command, const char* name, SkRRect* result) {
-    Json::Value rrect = command[name];
-    SkVector radii[4] = {
-                            { rrect[1][0].asFloat(), rrect[1][1].asFloat() }, 
-                            { rrect[2][0].asFloat(), rrect[2][1].asFloat() }, 
-                            { rrect[3][0].asFloat(), rrect[3][1].asFloat() }, 
-                            { rrect[4][0].asFloat(), rrect[4][1].asFloat() }
-                        };
-    result->setRectRadii(SkRect::MakeLTRB(rrect[0][0].asFloat(), rrect[0][1].asFloat(), 
-                                          rrect[0][2].asFloat(), rrect[0][3].asFloat()), 
-                         radii);
-}
-
-void Renderer::processMatrix(Json::Value& command, SkCanvas* target) {
-    Json::Value jsonMatrix = command[SKJSONCANVAS_ATTRIBUTE_MATRIX];
-    SkMatrix matrix;
-    SkScalar values[] = { 
-        jsonMatrix[0][0].asFloat(), jsonMatrix[0][1].asFloat(), jsonMatrix[0][2].asFloat(),
-        jsonMatrix[1][0].asFloat(), jsonMatrix[1][1].asFloat(), jsonMatrix[1][2].asFloat(),
-        jsonMatrix[2][0].asFloat(), jsonMatrix[2][1].asFloat(), jsonMatrix[2][2].asFloat() 
-    };
-    matrix.set9(values);
-    target->setMatrix(matrix);
-}
-
-void Renderer::processSave(Json::Value& command, SkCanvas* target) {
-    target->save();
-}
-
-void Renderer::processRestore(Json::Value& command, SkCanvas* target) {
-    target->restore();
-}
-
-void Renderer::processPaint(Json::Value& command, SkCanvas* target) {
-    SkPaint paint;
-    this->getPaint(command, &paint);
-    target->drawPaint(paint);
-}
-
-void Renderer::processRect(Json::Value& command, SkCanvas* target) {
-    SkRect rect;
-    this->getRect(command, SKJSONCANVAS_ATTRIBUTE_COORDS, &rect);
-    SkPaint paint;
-    this->getPaint(command, &paint);
-    target->drawRect(rect, paint);
-}
-
-void Renderer::processRRect(Json::Value& command, SkCanvas* target) {
-    SkRRect rrect;
-    this->getRRect(command, SKJSONCANVAS_ATTRIBUTE_COORDS, &rrect);
-    SkPaint paint;
-    this->getPaint(command, &paint);
-    target->drawRRect(rrect, paint);
-}
-
-void Renderer::processOval(Json::Value& command, SkCanvas* target) {
-    SkRect rect;
-    this->getRect(command, SKJSONCANVAS_ATTRIBUTE_COORDS, &rect);
-    SkPaint paint;
-    this->getPaint(command, &paint);
-    target->drawOval(rect, paint);
-}
-
-void Renderer::processPath(Json::Value& command, SkCanvas* target) {
-    Json::Value jsonPath = command[SKJSONCANVAS_ATTRIBUTE_PATH];
-    SkPath path;
-    for (Json::ArrayIndex i = 0; i < jsonPath.size(); i++) {
-        Json::Value verb = jsonPath[i];
-        if (verb.isString()) {
-            SkASSERT(!strcmp(verb.asCString(), SKJSONCANVAS_VERB_CLOSE));
-            path.close();
-        }
-        else {
-            if (verb.isMember(SKJSONCANVAS_VERB_MOVE)) {
-                Json::Value move = verb[SKJSONCANVAS_VERB_MOVE];
-                path.moveTo(move[0].asFloat(), move[1].asFloat());
-            }
-            else if (verb.isMember(SKJSONCANVAS_VERB_LINE)) {
-                Json::Value line = verb[SKJSONCANVAS_VERB_LINE];
-                path.lineTo(line[0].asFloat(), line[1].asFloat());
-            }
-            else if (verb.isMember(SKJSONCANVAS_VERB_QUAD)) {
-                Json::Value quad = verb[SKJSONCANVAS_VERB_QUAD];
-                path.quadTo(quad[0][0].asFloat(), quad[0][1].asFloat(),
-                            quad[1][0].asFloat(), quad[1][1].asFloat());
-            }
-            else if (verb.isMember(SKJSONCANVAS_VERB_CUBIC)) {
-                Json::Value cubic = verb[SKJSONCANVAS_VERB_CUBIC];
-                path.cubicTo(cubic[0][0].asFloat(), cubic[0][1].asFloat(),
-                             cubic[1][0].asFloat(), cubic[1][1].asFloat(),
-                             cubic[2][0].asFloat(), cubic[2][1].asFloat());
-            }
-            else if (verb.isMember(SKJSONCANVAS_VERB_CONIC)) {
-                Json::Value conic = verb[SKJSONCANVAS_VERB_CONIC];
-                path.conicTo(conic[0][0].asFloat(), conic[0][1].asFloat(),
-                             conic[1][0].asFloat(), conic[1][1].asFloat(),
-                             conic[2].asFloat());
-            }
-            else {
-                SkASSERT(false);
-            }
-        }
-    }
-    SkPaint paint;
-    this->getPaint(command, &paint);
-    target->drawPath(path, paint);
-}
-
-void Renderer::processText(Json::Value& command, SkCanvas* target) {
-    const char* text = command[SKJSONCANVAS_ATTRIBUTE_TEXT].asCString();
-    SkPaint paint;
-    this->getPaint(command, &paint);
-    Json::Value coords = command[SKJSONCANVAS_ATTRIBUTE_COORDS];
-    target->drawText(text, strlen(text), coords[0].asFloat(), coords[1].asFloat(), paint);
-}
-
-void Renderer::processPoints(Json::Value& command, SkCanvas* target) {
-    SkCanvas::PointMode mode;
-    const char* jsonMode = command[SKJSONCANVAS_ATTRIBUTE_MODE].asCString();
-    if (!strcmp(jsonMode, SKJSONCANVAS_POINTMODE_POINTS)) {
-        mode = SkCanvas::kPoints_PointMode;
-    }
-    else if (!strcmp(jsonMode, SKJSONCANVAS_POINTMODE_LINES)) {
-        mode = SkCanvas::kLines_PointMode;
-    }
-    else if (!strcmp(jsonMode, SKJSONCANVAS_POINTMODE_POLYGON)) {
-        mode = SkCanvas::kPolygon_PointMode;
-    }
-    else {
-        SkASSERT(false);
-        return;
-    }
-    Json::Value jsonPoints = command[SKJSONCANVAS_ATTRIBUTE_POINTS];
-    int count = (int) jsonPoints.size();
-    SkPoint* points = (SkPoint*) sk_malloc_throw(count * sizeof(SkPoint));
-    for (int i = 0; i < count; i++) {
-        points[i] = SkPoint::Make(jsonPoints[i][0].asFloat(), jsonPoints[i][1].asFloat());
-    }
-    SkPaint paint;
-    this->getPaint(command, &paint);
-    target->drawPoints(mode, count, points, paint);
-    free(points);
-}
-
-void Renderer::processClipRect(Json::Value& command, SkCanvas* target) {
-    SkRect rect;
-    this->getRect(command, SKJSONCANVAS_ATTRIBUTE_COORDS, &rect);
-    target->clipRect(rect);
-}
-
-void render(const char* json, SkCanvas* target) {
-    Renderer renderer;
-    Json::Reader reader;
-    Json::Value root;
-    if (reader.parse(std::string(json), root)) {
-        SkASSERT(root[SKJSONCANVAS_VERSION].asInt() == 1);
-        Json::Value commands = root[SKJSONCANVAS_COMMANDS];
-        for (Json::ArrayIndex i = 0; i < commands.size(); i++) {
-            renderer.processCommand(commands[i], target);
-        }
-    }
-    else {
-        SkDebugf(json);
-        SkFAIL("json parse failure");
-    }
-}
-
-} // namespace