PdfRenderer.cpp revision 2961769ea94f69c191a2dd785b2504666c7292d0 
1/*
2 * Copyright (C) 2014 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include "jni.h"
18#include "JNIHelp.h"
19#include "GraphicsJNI.h"
20#include "SkBitmap.h"
21#include "SkMatrix.h"
22#include "fpdfview.h"
23#include "fsdk_rendercontext.h"
24
25#include <android_runtime/AndroidRuntime.h>
26#include <vector>
27#include <utils/Log.h>
28#include <unistd.h>
29#include <sys/types.h>
30#include <unistd.h>
31
32namespace android {
33
34static const int RENDER_MODE_FOR_DISPLAY = 1;
35static const int RENDER_MODE_FOR_PRINT = 2;
36
37static struct {
38    jfieldID x;
39    jfieldID y;
40} gPointClassInfo;
41
42static Mutex sLock;
43
44static int sUnmatchedInitRequestCount = 0;
45
46static void initializeLibraryIfNeeded() {
47    Mutex::Autolock _l(sLock);
48    if (sUnmatchedInitRequestCount == 0) {
49        FPDF_InitLibrary(NULL);
50    }
51    sUnmatchedInitRequestCount++;
52}
53
54static void destroyLibraryIfNeeded() {
55    Mutex::Autolock _l(sLock);
56    sUnmatchedInitRequestCount--;
57    if (sUnmatchedInitRequestCount == 0) {
58       FPDF_DestroyLibrary();
59    }
60}
61
62static int getBlock(void* param, unsigned long position, unsigned char* outBuffer,
63        unsigned long size) {
64    const int fd = reinterpret_cast<intptr_t>(param);
65    const int readCount = pread(fd, outBuffer, size, position);
66    if (readCount < 0) {
67        ALOGE("Cannot read from file descriptor. Error:%d", errno);
68        return 0;
69    }
70    return 1;
71}
72
73static jlong nativeCreate(JNIEnv* env, jclass thiz, jint fd, jlong size) {
74    initializeLibraryIfNeeded();
75
76    FPDF_FILEACCESS loader;
77    loader.m_FileLen = size;
78    loader.m_Param = reinterpret_cast<void*>(intptr_t(fd));
79    loader.m_GetBlock = &getBlock;
80
81    FPDF_DOCUMENT document = FPDF_LoadCustomDocument(&loader, NULL);
82
83    if (!document) {
84        const long error = FPDF_GetLastError();
85        jniThrowException(env, "java/io/IOException",
86                "cannot create document. Error:" + error);
87        destroyLibraryIfNeeded();
88        return -1;
89    }
90
91    return reinterpret_cast<jlong>(document);
92}
93
94static jlong nativeOpenPageAndGetSize(JNIEnv* env, jclass thiz, jlong documentPtr,
95        jint pageIndex, jobject outSize) {
96    FPDF_DOCUMENT document = reinterpret_cast<FPDF_DOCUMENT>(documentPtr);
97
98    FPDF_PAGE page = FPDF_LoadPage(document, pageIndex);
99
100    if (!page) {
101        jniThrowException(env, "java/lang/IllegalStateException",
102                "cannot load page");
103        return -1;
104    }
105
106    double width = 0;
107    double height = 0;
108
109    const int result = FPDF_GetPageSizeByIndex(document, pageIndex, &width, &height);
110
111    if (!result) {
112        jniThrowException(env, "java/lang/IllegalStateException",
113                    "cannot get page size");
114        return -1;
115    }
116
117    env->SetIntField(outSize, gPointClassInfo.x, width);
118    env->SetIntField(outSize, gPointClassInfo.y, height);
119
120    return reinterpret_cast<jlong>(page);
121}
122
123static void nativeClosePage(JNIEnv* env, jclass thiz, jlong pagePtr) {
124    FPDF_PAGE page = reinterpret_cast<FPDF_PAGE>(pagePtr);
125    FPDF_ClosePage(page);
126}
127
128static void nativeClose(JNIEnv* env, jclass thiz, jlong documentPtr) {
129    FPDF_DOCUMENT document = reinterpret_cast<FPDF_DOCUMENT>(documentPtr);
130    FPDF_CloseDocument(document);
131    destroyLibraryIfNeeded();
132}
133
134static jint nativeGetPageCount(JNIEnv* env, jclass thiz, jlong documentPtr) {
135    FPDF_DOCUMENT document = reinterpret_cast<FPDF_DOCUMENT>(documentPtr);
136    return FPDF_GetPageCount(document);
137}
138
139static jboolean nativeScaleForPrinting(JNIEnv* env, jclass thiz, jlong documentPtr) {
140    FPDF_DOCUMENT document = reinterpret_cast<FPDF_DOCUMENT>(documentPtr);
141    return FPDF_VIEWERREF_GetPrintScaling(document);
142}
143
144static void DropContext(void* data) {
145    delete (CRenderContext*) data;
146}
147
148static void renderPageBitmap(FPDF_BITMAP bitmap, FPDF_PAGE page, int destLeft, int destTop,
149        int destRight, int destBottom, SkMatrix* transform, int flags) {
150    // Note: this code ignores the currently unused RENDER_NO_NATIVETEXT,
151    // FPDF_RENDER_LIMITEDIMAGECACHE, FPDF_RENDER_FORCEHALFTONE, FPDF_GRAYSCALE,
152    // and FPDF_ANNOT flags. To add support for that refer to FPDF_RenderPage_Retail
153    // in fpdfview.cpp
154
155    CRenderContext* pContext = FX_NEW CRenderContext;
156
157    CPDF_Page* pPage = (CPDF_Page*) page;
158    pPage->SetPrivateData((void*) 1, pContext, DropContext);
159
160    CFX_FxgeDevice* fxgeDevice = FX_NEW CFX_FxgeDevice;
161    pContext->m_pDevice = fxgeDevice;
162
163    // Reverse the bytes (last argument TRUE) since the Android
164    // format is ARGB while the renderer uses BGRA internally.
165    fxgeDevice->Attach((CFX_DIBitmap*) bitmap, 0, TRUE);
166
167    CPDF_RenderOptions* renderOptions = pContext->m_pOptions;
168
169    if (!renderOptions) {
170        renderOptions = FX_NEW CPDF_RenderOptions;
171        pContext->m_pOptions = renderOptions;
172    }
173
174    if (flags & FPDF_LCD_TEXT) {
175        renderOptions->m_Flags |= RENDER_CLEARTYPE;
176    } else {
177        renderOptions->m_Flags &= ~RENDER_CLEARTYPE;
178    }
179
180    const CPDF_OCContext::UsageType usage = (flags & FPDF_PRINTING)
181            ? CPDF_OCContext::Print : CPDF_OCContext::View;
182
183    renderOptions->m_AddFlags = flags >> 8;
184    renderOptions->m_pOCContext = new CPDF_OCContext(pPage->m_pDocument, usage);
185
186    fxgeDevice->SaveState();
187
188    FX_RECT clip;
189    clip.left = destLeft;
190    clip.right = destRight;
191    clip.top = destTop;
192    clip.bottom = destBottom;
193    fxgeDevice->SetClip_Rect(&clip);
194
195    CPDF_RenderContext* pageContext = FX_NEW CPDF_RenderContext;
196    pContext->m_pContext = pageContext;
197    pageContext->Create(pPage);
198
199    CFX_AffineMatrix matrix;
200    if (!transform) {
201        pPage->GetDisplayMatrix(matrix, destLeft, destTop, destRight - destLeft,
202                destBottom - destTop, 0);
203    } else {
204        // PDF's coordinate system origin is left-bottom while
205        // in graphics it is the top-left, so remap the origin.
206        matrix.Set(1, 0, 0, -1, 0, pPage->GetPageHeight());
207        matrix.Scale(transform->getScaleX(), transform->getScaleY());
208        matrix.Rotate(transform->getSkewX(), transform->getSkewY());
209        matrix.Translate(transform->getTranslateX(), transform->getTranslateY());
210    }
211    pageContext->AppendObjectList(pPage, &matrix);
212
213    pContext->m_pRenderer = FX_NEW CPDF_ProgressiveRenderer;
214    pContext->m_pRenderer->Start(pageContext, fxgeDevice, renderOptions, NULL);
215
216    fxgeDevice->RestoreState();
217
218    pPage->RemovePrivateData((void*) 1);
219
220    delete pContext;
221}
222
223static void nativeRenderPage(JNIEnv* env, jclass thiz, jlong documentPtr, jlong pagePtr,
224        jlong bitmapPtr, jint destLeft, jint destTop, jint destRight, jint destBottom,
225        jlong matrixPtr, jint renderMode) {
226
227    FPDF_DOCUMENT document = reinterpret_cast<FPDF_DOCUMENT>(documentPtr);
228    FPDF_PAGE page = reinterpret_cast<FPDF_PAGE>(pagePtr);
229    SkBitmap* skBitmap = reinterpret_cast<SkBitmap*>(bitmapPtr);
230    SkMatrix* skMatrix = reinterpret_cast<SkMatrix*>(matrixPtr);
231
232    skBitmap->lockPixels();
233
234    const int stride = skBitmap->width() * 4;
235
236    FPDF_BITMAP bitmap = FPDFBitmap_CreateEx(skBitmap->width(), skBitmap->height(),
237            FPDFBitmap_BGRA, skBitmap->getPixels(), stride);
238
239    if (!bitmap) {
240        ALOGE("Erorr creating bitmap");
241        return;
242    }
243
244    int renderFlags = 0;
245    if (renderMode == RENDER_MODE_FOR_DISPLAY) {
246        renderFlags |= FPDF_LCD_TEXT;
247    } else if (renderMode == RENDER_MODE_FOR_PRINT) {
248        renderFlags |= FPDF_PRINTING;
249    }
250
251    renderPageBitmap(bitmap, page, destLeft, destTop, destRight,
252            destBottom, skMatrix, renderFlags);
253
254    skBitmap->unlockPixels();
255}
256
257static JNINativeMethod gPdfRenderer_Methods[] = {
258    {"nativeCreate", "(IJ)J", (void*) nativeCreate},
259    {"nativeClose", "(J)V", (void*) nativeClose},
260    {"nativeGetPageCount", "(J)I", (void*) nativeGetPageCount},
261    {"nativeScaleForPrinting", "(J)Z", (void*) nativeScaleForPrinting},
262    {"nativeRenderPage", "(JJJIIIIJI)V", (void*) nativeRenderPage},
263    {"nativeOpenPageAndGetSize", "(JILandroid/graphics/Point;)J", (void*) nativeOpenPageAndGetSize},
264    {"nativeClosePage", "(J)V", (void*) nativeClosePage}
265};
266
267int register_android_graphics_pdf_PdfRenderer(JNIEnv* env) {
268    int result = android::AndroidRuntime::registerNativeMethods(
269            env, "android/graphics/pdf/PdfRenderer", gPdfRenderer_Methods,
270            NELEM(gPdfRenderer_Methods));
271
272    jclass clazz = env->FindClass("android/graphics/Point");
273    gPointClassInfo.x = env->GetFieldID(clazz, "x", "I");
274    gPointClassInfo.y = env->GetFieldID(clazz, "y", "I");
275
276    return result;
277};
278
279};
280