Initial support for turning Skia draws into a JSON document and vice versa.
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1636563002
Committed: https://skia.googlesource.com/skia/+/3cb582f688822461efa5a034e18008bf2f11e4f8
Review URL: https://codereview.chromium.org/1636563002
diff --git a/tools/json/SkJSONRenderer.cpp b/tools/json/SkJSONRenderer.cpp
new file mode 100644
index 0000000..f9bb6ee
--- /dev/null
+++ b/tools/json/SkJSONRenderer.cpp
@@ -0,0 +1,289 @@
+/*
+ * 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