annotate Framework/Viewport/CairoSurface.cpp @ 457:3b4df9925db6 am-touch-events

added support for 'touch' in mouse trackers. This is still a bit hacky and we need to refactor it to make it clean. Thanks to that, Pan and zoom are available together with 2 touches
author Alain Mazy <alain@mazy.be>
date Thu, 24 Jan 2019 16:42:27 +0100
parents b70e9be013e4
children b1e1eccee214
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1 /**
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2 * Stone of Orthanc
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3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
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4 * Department, University Hospital of Liege, Belgium
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5 * Copyright (C) 2017-2019 Osimis S.A., Belgium
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6 *
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7 * This program is free software: you can redistribute it and/or
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8 * modify it under the terms of the GNU Affero General Public License
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9 * as published by the Free Software Foundation, either version 3 of
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10 * the License, or (at your option) any later version.
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11 *
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12 * This program is distributed in the hope that it will be useful, but
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13 * WITHOUT ANY WARRANTY; without even the implied warranty of
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 * Affero General Public License for more details.
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16 *
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17 * You should have received a copy of the GNU Affero General Public License
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18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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19 **/
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22 #include "CairoSurface.h"
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24 #include <Core/Logging.h>
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25 #include <Core/OrthancException.h>
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26 #include <Core/Images/ImageProcessing.h>
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28 namespace OrthancStone
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29 {
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30 void CairoSurface::Release()
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31 {
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32 if (surface_)
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33 {
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34 cairo_surface_destroy(surface_);
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35 surface_ = NULL;
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36 }
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37 }
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40 void CairoSurface::Allocate(unsigned int width,
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41 unsigned int height)
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42 {
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43 Release();
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45 surface_ = cairo_image_surface_create(CAIRO_FORMAT_RGB24, width, height);
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46 if (!surface_)
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47 {
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48 // Should never occur
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49 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
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50 }
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51
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52 if (cairo_surface_status(surface_) != CAIRO_STATUS_SUCCESS)
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53 {
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54 LOG(ERROR) << "Cannot create a Cairo surface";
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55 cairo_surface_destroy(surface_);
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56 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
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57 }
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58
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59 width_ = width;
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60 height_ = height;
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61 pitch_ = cairo_image_surface_get_stride(surface_);
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62 buffer_ = cairo_image_surface_get_data(surface_);
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63 }
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66 CairoSurface::CairoSurface(Orthanc::ImageAccessor& accessor)
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67 {
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68 if (accessor.GetFormat() != Orthanc::PixelFormat_BGRA32)
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69 {
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70 throw Orthanc::OrthancException(Orthanc::ErrorCode_IncompatibleImageFormat);
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71 }
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73 width_ = accessor.GetWidth();
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74 height_ = accessor.GetHeight();
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75 pitch_ = accessor.GetPitch();
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76 buffer_ = accessor.GetBuffer();
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78 surface_ = cairo_image_surface_create_for_data
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79 (reinterpret_cast<unsigned char*>(buffer_), CAIRO_FORMAT_RGB24, width_, height_, pitch_);
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80 if (!surface_)
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81 {
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82 // Should never occur
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83 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
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84 }
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85
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86 if (cairo_surface_status(surface_) != CAIRO_STATUS_SUCCESS)
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87 {
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88 LOG(ERROR) << "Bad pitch for a Cairo surface";
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89 cairo_surface_destroy(surface_);
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90 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
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91 }
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92 }
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95 void CairoSurface::SetSize(unsigned int width,
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96 unsigned int height)
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97 {
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98 if (width_ != width ||
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99 height_ != height)
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100 {
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101 Allocate(width, height);
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102 }
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103 }
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104
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105
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106 void CairoSurface::Copy(const CairoSurface& other)
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107 {
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108 Orthanc::ImageAccessor source, target;
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109
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110 other.GetReadOnlyAccessor(source);
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111 GetWriteableAccessor(target);
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112
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113 Orthanc::ImageProcessing::Copy(target, source);
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114 }
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117 void CairoSurface::GetReadOnlyAccessor(Orthanc::ImageAccessor& target) const
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118 {
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119 target.AssignReadOnly(Orthanc::PixelFormat_BGRA32, width_, height_, pitch_, buffer_);
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120 }
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121
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123 void CairoSurface::GetWriteableAccessor(Orthanc::ImageAccessor& target)
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124 {
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125 target.AssignWritable(Orthanc::PixelFormat_BGRA32, width_, height_, pitch_, buffer_);
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126 }
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127 }