blob: f3a329379cdd4a19d319552bd52a253ef5d7bbbd [file] [log] [blame]
* Copyright 2021 Google Inc.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
#include <jni.h>
#include "experimental/sktext/src/Paint.h"
#include "modules/androidkit/src/Utils.h"
#include <string>
using namespace skia::text;
namespace {
// conversion function for passing jstrings to SkText static calls
static std::u16string JStringToU16String(JNIEnv* env, const jstring& jstr) {
const jchar* u16 = env->GetStringChars(jstr, nullptr);
std::u16string str(reinterpret_cast<const char16_t*>(u16), env->GetStringLength(jstr));
env->ReleaseStringChars(jstr, u16);
return str;
static void Text_RenderText(JNIEnv* env, jobject, jstring jtext,
jlong native_canvas, jlong native_fg_paint,
jfloat x, jfloat y) {
auto* canvas = reinterpret_cast<SkCanvas*>(native_canvas);
auto foreground = reinterpret_cast<SkPaint*>(native_fg_paint);
std::u16string u16str = JStringToU16String(env, jtext);
if (canvas && foreground) {
SkPaint background(SkColors::kTransparent);
Paint::drawText(u16str, canvas,
skia::text::TextDirection::kLtr, skia::text::TextAlign::kLeft,
*foreground, background, SkString("arial"), 50, SkFontStyle::Bold(), x, y);
} //namespace
int register_androidkit_Text(JNIEnv* env) {
static const JNINativeMethod methods[] = {
{"nRenderText", "(Ljava/lang/String;JJFF)V", reinterpret_cast<void*>(Text_RenderText)},
const auto clazz = env->FindClass("org/skia/androidkit/Text");
return clazz
? env->RegisterNatives(clazz, methods, std::size(methods))