source/modules/juce_graphics/images/juce_ImageFileFormat.cpp

   1 /*
   2   ==============================================================================
   3
   4    This file is part of the JUCE library.
   5    Copyright (c) 2022 - Raw Material Software Limited
   6
   7    JUCE is an open source library subject to commercial or open-source
   8    licensing.
   9
  10    By using JUCE, you agree to the terms of both the JUCE 7 End-User License
  11    Agreement and JUCE Privacy Policy.
  12
  13    End User License Agreement: www.juce.com/juce-7-licence
  14    Privacy Policy: www.juce.com/juce-privacy-policy
  15
  16    Or: You may also use this code under the terms of the GPL v3 (see
  17    www.gnu.org/licenses).
  18
  19    JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
  20    EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
  21    DISCLAIMED.
  22
  23   ==============================================================================
  24 */
  25
  26 namespace juce
  27 {
  28
  29 struct DefaultImageFormats
  30 {
  31     static ImageFileFormat** get()
  32     {
  33         static DefaultImageFormats formats;
  34         return formats.formats;
  35     }
  36
  37 private:
  38     DefaultImageFormats() noexcept
  39     {
  40         formats[0] = &png;
  41         formats[1] = &jpg;
  42         formats[2] = &gif;
  43         formats[3] = nullptr;
  44     }
  45
  46     PNGImageFormat  png;
  47     JPEGImageFormat jpg;
  48     GIFImageFormat  gif;
  49
  50     ImageFileFormat* formats[4];
  51 };
  52
  53 ImageFileFormat* ImageFileFormat::findImageFormatForStream (InputStream& input)
  54 {
  55     const int64 streamPos = input.getPosition();
  56
  57     for (ImageFileFormat** i = DefaultImageFormats::get(); *i != nullptr; ++i)
  58     {
  59         const bool found = (*i)->canUnderstand (input);
  60         input.setPosition (streamPos);
  61
  62         if (found)
  63             return *i;
  64     }
  65
  66     return nullptr;
  67 }
  68
  69 ImageFileFormat* ImageFileFormat::findImageFormatForFileExtension (const File& file)
  70 {
  71     for (ImageFileFormat** i = DefaultImageFormats::get(); *i != nullptr; ++i)
  72         if ((*i)->usesFileExtension (file))
  73             return *i;
  74
  75     return nullptr;
  76 }
  77
  78 //==============================================================================
  79 Image ImageFileFormat::loadFrom (InputStream& input)
  80 {
  81     if (ImageFileFormat* format = findImageFormatForStream (input))
  82         return format->decodeImage (input);
  83
  84     return Image();
  85 }
  86
  87 Image ImageFileFormat::loadFrom (const File& file)
  88 {
  89     FileInputStream stream (file);
  90
  91     if (stream.openedOk())
  92     {
  93         BufferedInputStream b (stream, 8192);
  94         return loadFrom (b);
  95     }
  96
  97     return Image();
  98 }
  99
 100 Image ImageFileFormat::loadFrom (const void* rawData, const size_t numBytes)
 101 {
 102     if (rawData != nullptr && numBytes > 4)
 103     {
 104         MemoryInputStream stream (rawData, numBytes, false);
 105         return loadFrom (stream);
 106     }
 107
 108     return Image();
 109 }
 110
 111 } // namespace juce