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      1 /*
      2  * Copyright 2013 Google Inc.
      3  *
      4  * Use of this source code is governed by a BSD-style license that can be
      5  * found in the LICENSE file.
      6  */
      7 
      8 #ifndef SkPdfUtils_DEFINED
      9 #define SkPdfUtils_DEFINED
     10 
     11 #include "SkMatrix.h"
     12 #include "SkRect.h"
     13 #include "SkPdfConfig.h"
     14 #include "SkString.h"
     15 
     16 class SkPdfArray;
     17 class SkPdfContext;
     18 class SkCanvas;
     19 class SkPdfNativeObject;
     20 
     21 // TODO(edisonn): temporary code, to report how much of the PDF we actually think we rendered.
     22 enum SkPdfResult {
     23     kOK_SkPdfResult,
     24     kPartial_SkPdfResult,
     25     kNYI_SkPdfResult,
     26     kIgnoreError_SkPdfResult,
     27     kError_SkPdfResult,
     28     kUnsupported_SkPdfResult,
     29 
     30     kCount_SkPdfResult
     31 };
     32 
     33 // In order to operate fast, when we parse the pdf, we try not to allocate many new strings,
     34 // and if possible we refer the string in the pdf stream.
     35 struct NotOwnedString {
     36     const unsigned char* fBuffer;
     37     // TODO(edisonn): clean up, the last two bytes are used to signal if compression is used
     38     size_t fBytes;
     39 
     40     static void init(NotOwnedString* str) {
     41         str->fBuffer = NULL;
     42         str->fBytes = 0;
     43     }
     44 
     45     static void init(NotOwnedString* str, const char* sz) {
     46         str->fBuffer = (const unsigned char*)sz;
     47         str->fBytes = strlen(sz);
     48     }
     49 
     50     bool equals(const char* sz) {
     51         return strncmp((const char*)fBuffer, sz, fBytes) == 0 && fBytes == strlen(sz);
     52 
     53     }
     54 };
     55 
     56 SkMatrix SkMatrixFromPdfMatrix(double array[6]);
     57 
     58 // TODO(edisonn): hack to make code generation simpler. Alternatively we can update the
     59 // generate_code.py not to rely on != operator
     60 bool operator !=(const SkString& first, const char* second);
     61 
     62 SkMatrix SkMatrixFromPdfArray(SkPdfArray* pdfArray);
     63 
     64 SkPdfResult doType3Char(SkPdfContext* pdfContext, SkCanvas* canvas, const SkPdfNativeObject* skobj,
     65                         SkRect bBox, SkMatrix matrix, double textSize);
     66 
     67 ////////////////////////////////////////////////////////////////////////////////////////////////////
     68 //
     69 // TRACE functions
     70 //
     71 #ifdef PDF_TRACE
     72 void SkTraceMatrix(const SkMatrix& matrix, const char* sz);
     73 void SkTraceRect(const SkRect& rect, const char* sz);
     74 #else
     75 #define SkTraceMatrix(a,b)
     76 #define SkTraceRect(a,b)
     77 #endif
     78 
     79 #ifdef PDF_TRACE_TOKENIZER
     80 
     81 static void TRACE_COMMENT(char ch) {
     82     printf("%c", ch);
     83 }
     84 
     85 static void TRACE_TK(char ch) {
     86     printf("%c", ch);
     87 }
     88 
     89 static void TRACE_NAME(const unsigned char* start, const unsigned char* end) {
     90     while (start < end) {
     91         printf("%c", *start);
     92         start++;
     93     }
     94     printf("\n");
     95 }
     96 
     97 static void TRACE_STRING(const unsigned char* start, const unsigned char* end) {
     98     while (start < end) {
     99         printf("%c", *start);
    100         start++;
    101     }
    102     printf("\n");
    103 }
    104 
    105 static void TRACE_HEXSTRING(const unsigned char* start, const unsigned char* end) {
    106     while (start < end) {
    107         printf("%c", *start);
    108         start++;
    109     }
    110     printf("\n");
    111 }
    112 
    113 #else
    114 #define TRACE_COMMENT(ch)
    115 #define TRACE_TK(ch)
    116 #define TRACE_NAME(start,end)
    117 #define TRACE_STRING(start,end)
    118 #define TRACE_HEXSTRING(start,end)
    119 #endif
    120 
    121 #endif   // SkPdfUtils_DEFINED
    122