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/*
* Copyright (C) 2013 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "jni.h"
#include "GraphicsJNI.h"
#include <android_runtime/AndroidRuntime.h>
#include <vector>
#include "CreateJavaOutputStreamAdaptor.h"
#include "SkCanvas.h"
#include "SkDocument.h"
#include "SkPicture.h"
#include "SkStream.h"
#include "SkRect.h"
namespace android {
struct PageRecord {
PageRecord(int width, int height, const SkRect& contentRect)
: mPicture(new SkPicture()), mWidth(width), mHeight(height) {
mContentRect = contentRect;
}
~PageRecord() {
mPicture->unref();
}
SkPicture* const mPicture;
const int mWidth;
const int mHeight;
SkRect mContentRect;
};
class PdfDocument {
public:
PdfDocument() {
mCurrentPage = NULL;
}
SkCanvas* startPage(int width, int height,
int contentLeft, int contentTop, int contentRight, int contentBottom) {
assert(mCurrentPage == NULL);
SkRect contentRect = SkRect::MakeLTRB(
contentLeft, contentTop, contentRight, contentBottom);
PageRecord* page = new PageRecord(width, height, contentRect);
mPages.push_back(page);
mCurrentPage = page;
SkCanvas* canvas = page->mPicture->beginRecording(
contentRect.width(), contentRect.height(), 0);
// We pass this canvas to Java where it is used to construct
// a Java Canvas object which dereferences the pointer when it
// is destroyed, so we have to bump up the reference count.
canvas->ref();
return canvas;
}
void finishPage() {
assert(mCurrentPage != NULL);
mCurrentPage->mPicture->endRecording();
mCurrentPage = NULL;
}
void write(SkWStream* stream) {
SkDocument* document = SkDocument::CreatePDF(stream);
for (unsigned i = 0; i < mPages.size(); i++) {
PageRecord* page = mPages[i];
SkCanvas* canvas = document->beginPage(page->mWidth, page->mHeight,
&(page->mContentRect));
canvas->clipRect(page->mContentRect);
canvas->translate(page->mContentRect.left(), page->mContentRect.top());
canvas->drawPicture(*page->mPicture);
document->endPage();
}
document->close();
}
void close() {
for (unsigned i = 0; i < mPages.size(); i++) {
delete mPages[i];
}
delete mCurrentPage;
mCurrentPage = NULL;
}
private:
~PdfDocument() {
close();
}
std::vector<PageRecord*> mPages;
PageRecord* mCurrentPage;
};
static jint nativeCreateDocument(JNIEnv* env, jobject thiz) {
return reinterpret_cast<jint>(new PdfDocument());
}
static jint nativeStartPage(JNIEnv* env, jobject thiz, jint documentPtr,
jint pageWidth, jint pageHeight,
jint contentLeft, jint contentTop, jint contentRight, jint contentBottom) {
PdfDocument* document = reinterpret_cast<PdfDocument*>(documentPtr);
return reinterpret_cast<jint>(document->startPage(pageWidth, pageHeight,
contentLeft, contentTop, contentRight, contentBottom));
}
static void nativeFinishPage(JNIEnv* env, jobject thiz, jint documentPtr) {
PdfDocument* document = reinterpret_cast<PdfDocument*>(documentPtr);
document->finishPage();
}
static void nativeWriteTo(JNIEnv* env, jobject thiz, jint documentPtr, jobject out,
jbyteArray chunk) {
PdfDocument* document = reinterpret_cast<PdfDocument*>(documentPtr);
SkWStream* skWStream = CreateJavaOutputStreamAdaptor(env, out, chunk);
document->write(skWStream);
delete skWStream;
}
static void nativeClose(JNIEnv* env, jobject thiz, jint documentPtr) {
PdfDocument* document = reinterpret_cast<PdfDocument*>(documentPtr);
document->close();
}
static JNINativeMethod gPdfDocument_Methods[] = {
{"nativeCreateDocument", "()I", (void*) nativeCreateDocument},
{"nativeStartPage", "(IIIIIII)I", (void*) nativeStartPage},
{"nativeFinishPage", "(I)V", (void*) nativeFinishPage},
{"nativeWriteTo", "(ILjava/io/OutputStream;[B)V", (void*) nativeWriteTo},
{"nativeClose", "(I)V", (void*) nativeClose}
};
int register_android_graphics_pdf_PdfDocument(JNIEnv* env) {
int result = android::AndroidRuntime::registerNativeMethods(
env, "android/graphics/pdf/PdfDocument", gPdfDocument_Methods,
NELEM(gPdfDocument_Methods));
return result;
}
};
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