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      1 /*
      2  * Copyright 2011 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 #ifndef SkPDFUtils_DEFINED
      8 #define SkPDFUtils_DEFINED
      9 
     10 #include "SkFloatToDecimal.h"
     11 #include "SkPDFTypes.h"
     12 #include "SkPaint.h"
     13 #include "SkPath.h"
     14 #include "SkShader.h"
     15 #include "SkStream.h"
     16 #include "SkUtils.h"
     17 
     18 class SkMatrix;
     19 class SkPDFArray;
     20 struct SkRect;
     21 
     22 template <typename T>
     23 bool SkPackedArrayEqual(T* u, T* v, size_t n) {
     24     SkASSERT(u);
     25     SkASSERT(v);
     26     return 0 == memcmp(u, v, n * sizeof(T));
     27 }
     28 
     29 #if 0
     30 #define PRINT_NOT_IMPL(str) fprintf(stderr, str)
     31 #else
     32 #define PRINT_NOT_IMPL(str)
     33 #endif
     34 
     35 #define NOT_IMPLEMENTED(condition, assert)                         \
     36     do {                                                           \
     37         if ((bool)(condition)) {                                   \
     38             PRINT_NOT_IMPL("NOT_IMPLEMENTED: " #condition "\n");   \
     39             SkDEBUGCODE(SkASSERT(!assert);)                        \
     40         }                                                          \
     41     } while (0)
     42 
     43 namespace SkPDFUtils {
     44 
     45 const char* BlendModeName(SkBlendMode);
     46 
     47 std::unique_ptr<SkPDFArray> RectToArray(const SkRect& rect);
     48 std::unique_ptr<SkPDFArray> MatrixToArray(const SkMatrix& matrix);
     49 
     50 void MoveTo(SkScalar x, SkScalar y, SkWStream* content);
     51 void AppendLine(SkScalar x, SkScalar y, SkWStream* content);
     52 void AppendRectangle(const SkRect& rect, SkWStream* content);
     53 void EmitPath(const SkPath& path, SkPaint::Style paintStyle,
     54               bool doConsumeDegerates, SkWStream* content, SkScalar tolerance = 0.25f);
     55 inline void EmitPath(const SkPath& path, SkPaint::Style paintStyle,
     56                      SkWStream* content, SkScalar tolerance = 0.25f) {
     57     SkPDFUtils::EmitPath(path, paintStyle, true, content, tolerance);
     58 }
     59 void ClosePath(SkWStream* content);
     60 void PaintPath(SkPaint::Style style, SkPath::FillType fill,
     61                       SkWStream* content);
     62 void StrokePath(SkWStream* content);
     63 void ApplyGraphicState(int objectIndex, SkWStream* content);
     64 void ApplyPattern(int objectIndex, SkWStream* content);
     65 
     66 // Converts (value / 255.0) with three significant digits of accuracy.
     67 // Writes value as string into result.  Returns strlen() of result.
     68 size_t ColorToDecimal(uint8_t value, char result[5]);
     69 
     70 static constexpr unsigned kFloatColorDecimalCount = 4;
     71 size_t ColorToDecimalF(float value, char result[kFloatColorDecimalCount + 2]);
     72 inline void AppendColorComponent(uint8_t value, SkWStream* wStream) {
     73     char buffer[5];
     74     size_t len = SkPDFUtils::ColorToDecimal(value, buffer);
     75     wStream->write(buffer, len);
     76 }
     77 inline void AppendColorComponentF(float value, SkWStream* wStream) {
     78     char buffer[kFloatColorDecimalCount + 2];
     79     size_t len = SkPDFUtils::ColorToDecimalF(value, buffer);
     80     wStream->write(buffer, len);
     81 }
     82 
     83 inline void AppendScalar(SkScalar value, SkWStream* stream) {
     84     char result[kMaximumSkFloatToDecimalLength];
     85     size_t len = SkFloatToDecimal(SkScalarToFloat(value), result);
     86     SkASSERT(len < kMaximumSkFloatToDecimalLength);
     87     stream->write(result, len);
     88 }
     89 
     90 inline void WriteUInt16BE(SkDynamicMemoryWStream* wStream, uint16_t value) {
     91     char result[4] = { SkHexadecimalDigits::gUpper[       value >> 12 ],
     92                        SkHexadecimalDigits::gUpper[0xF & (value >> 8 )],
     93                        SkHexadecimalDigits::gUpper[0xF & (value >> 4 )],
     94                        SkHexadecimalDigits::gUpper[0xF & (value      )] };
     95     wStream->write(result, 4);
     96 }
     97 
     98 inline void WriteUInt8(SkDynamicMemoryWStream* wStream, uint8_t value) {
     99     char result[2] = { SkHexadecimalDigits::gUpper[value >> 4],
    100                        SkHexadecimalDigits::gUpper[value & 0xF] };
    101     wStream->write(result, 2);
    102 }
    103 
    104 inline void WriteUTF16beHex(SkDynamicMemoryWStream* wStream, SkUnichar utf32) {
    105     uint16_t utf16[2] = {0, 0};
    106     size_t len = SkUTF::ToUTF16(utf32, utf16);
    107     SkASSERT(len == 1 || len == 2);
    108     SkPDFUtils::WriteUInt16BE(wStream, utf16[0]);
    109     if (len == 2) {
    110         SkPDFUtils::WriteUInt16BE(wStream, utf16[1]);
    111     }
    112 }
    113 
    114 inline SkMatrix GetShaderLocalMatrix(const SkShader* shader) {
    115     SkMatrix localMatrix;
    116     if (sk_sp<SkShader> s = shader->makeAsALocalMatrixShader(&localMatrix)) {
    117         return SkMatrix::Concat(s->getLocalMatrix(), localMatrix);
    118     }
    119     return shader->getLocalMatrix();
    120 }
    121 bool InverseTransformBBox(const SkMatrix& matrix, SkRect* bbox);
    122 void PopulateTilingPatternDict(SkPDFDict* pattern,
    123                                SkRect& bbox,
    124                                std::unique_ptr<SkPDFDict> resources,
    125                                const SkMatrix& matrix);
    126 
    127 bool ToBitmap(const SkImage* img, SkBitmap* dst);
    128 
    129 #ifdef SK_PDF_BASE85_BINARY
    130 void Base85Encode(std::unique_ptr<SkStreamAsset> src, SkDynamicMemoryWStream* dst);
    131 #endif //  SK_PDF_BASE85_BINARY
    132 
    133 }  // namespace SkPDFUtils
    134 
    135 #endif
    136