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()); 207 208 SkScalar transformValues[6]; 209 transform->asAffine(transformValues); 210 211 matrix.Concat(transformValues[SkMatrix::kAScaleX], transformValues[SkMatrix::kASkewY], 212 transformValues[SkMatrix::kASkewX], transformValues[SkMatrix::kAScaleY], 213 transformValues[SkMatrix::kATransX], transformValues[SkMatrix::kATransY]); 214 } 215 pageContext->AppendObjectList(pPage, &matrix); 216 217 pContext->m_pRenderer = FX_NEW CPDF_ProgressiveRenderer; 218 pContext->m_pRenderer->Start(pageContext, fxgeDevice, renderOptions, NULL); 219 220 fxgeDevice->RestoreState(); 221 222 pPage->RemovePrivateData((void*) 1); 223 224 delete pContext; 225} 226 227static void nativeRenderPage(JNIEnv* env, jclass thiz, jlong documentPtr, jlong pagePtr, 228 jlong bitmapPtr, jint destLeft, jint destTop, jint destRight, jint destBottom, 229 jlong matrixPtr, jint renderMode) { 230 231 FPDF_DOCUMENT document = reinterpret_cast<FPDF_DOCUMENT>(documentPtr); 232 FPDF_PAGE page = reinterpret_cast<FPDF_PAGE>(pagePtr); 233 SkBitmap* skBitmap = reinterpret_cast<SkBitmap*>(bitmapPtr); 234 SkMatrix* skMatrix = reinterpret_cast<SkMatrix*>(matrixPtr); 235 236 skBitmap->lockPixels(); 237 238 const int stride = skBitmap->width() * 4; 239 240 FPDF_BITMAP bitmap = FPDFBitmap_CreateEx(skBitmap->width(), skBitmap->height(), 241 FPDFBitmap_BGRA, skBitmap->getPixels(), stride); 242 243 if (!bitmap) { 244 ALOGE("Erorr creating bitmap"); 245 return; 246 } 247 248 int renderFlags = 0; 249 if (renderMode == RENDER_MODE_FOR_DISPLAY) { 250 renderFlags |= FPDF_LCD_TEXT; 251 } else if (renderMode == RENDER_MODE_FOR_PRINT) { 252 renderFlags |= FPDF_PRINTING; 253 } 254 255 renderPageBitmap(bitmap, page, destLeft, destTop, destRight, 256 destBottom, skMatrix, renderFlags); 257 258 skBitmap->notifyPixelsChanged(); 259 skBitmap->unlockPixels(); 260} 261 262static JNINativeMethod gPdfRenderer_Methods[] = { 263 {"nativeCreate", "(IJ)J", (void*) nativeCreate}, 264 {"nativeClose", "(J)V", (void*) nativeClose}, 265 {"nativeGetPageCount", "(J)I", (void*) nativeGetPageCount}, 266 {"nativeScaleForPrinting", "(J)Z", (void*) nativeScaleForPrinting}, 267 {"nativeRenderPage", "(JJJIIIIJI)V", (void*) nativeRenderPage}, 268 {"nativeOpenPageAndGetSize", "(JILandroid/graphics/Point;)J", (void*) nativeOpenPageAndGetSize}, 269 {"nativeClosePage", "(J)V", (void*) nativeClosePage} 270}; 271 272int register_android_graphics_pdf_PdfRenderer(JNIEnv* env) { 273 int result = android::AndroidRuntime::registerNativeMethods( 274 env, "android/graphics/pdf/PdfRenderer", gPdfRenderer_Methods, 275 NELEM(gPdfRenderer_Methods)); 276 277 jclass clazz = env->FindClass("android/graphics/Point"); 278 gPointClassInfo.x = env->GetFieldID(clazz, "x", "I"); 279 gPointClassInfo.y = env->GetFieldID(clazz, "y", "I"); 280 281 return result; 282}; 283 284}; 285