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qplatformgraphicsbuffer.cpp

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1 /**************************************************************************** -

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4 ** Contact: https://www.qt.io/licensing/ -

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6 ** This file is part of the QtGui module of the Qt Toolkit. -

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38 ****************************************************************************/ -

39 -

40 #include "qplatformgraphicsbuffer.h" -

41 #include <QtGui/QOpenGLContext> -

42 #include <QtGui/QOpenGLFunctions> -

43 #include <QtGui/qopengl.h> -

44 #include <QtCore/QDebug> -

45 -

46 QT_BEGIN_NAMESPACE -

47 /*! -

48 \class QPlatformGraphicsBuffer -

49 \inmodule QtGui -

50 \since 5.5 -

51 \brief The QPlatformGraphicsBuffer is a windowsystem abstraction for native graphics buffers -

52 -

53 Different platforms have different ways of representing graphics buffers. On -

54 some platforms, it is possible to create one graphics buffer that you can bind -

55 to a texture and also get main memory access to the image bits. On the -

56 other hand, on some platforms all graphics buffer abstraction is completely -

57 hidden. -

58 -

59 QPlatformGraphicsBuffer is an abstraction of a single Graphics Buffer. -

60 -

61 There is no public constructor nor any public factory function. -

62 -

63 QPlatformGraphicsBuffer is intended to be created by using platform specific -

64 APIs available from QtPlatformHeaders, or there might be accessor functions -

65 similar to the accessor function that QPlatformBackingstore has. -

66 */ -

67 -

68 /*! -

69 \enum QPlatformGraphicsBuffer::AccessType -

70 -

71 This enum describes the access that is desired or granted for the graphics -

72 buffer. -

73 -

74 \value None -

75 \value SWReadAccess -

76 \value SWWriteAccess -

77 \value TextureAccess -

78 \value HWCompositor -

79 */ -

80 -

81 /*! -

82 \enum QPlatformGraphicsBuffer::Origin -

83 -

84 This enum describes the origin of the content of the buffer. -

85 -

86 \value OriginTopLeft -

87 \value OriginBottomLeft -

88 */ -

89 -

90 /*! -

91 Protected constructor to initialize the private members. -

92 -

93 \a size is the size of the buffer. -

94 \a format is the format of the buffer. -

95 -

96 \sa size() format() -

97 */ -

98 QPlatformGraphicsBuffer::QPlatformGraphicsBuffer(const QSize &size, const QPixelFormat &format) -

99 : m_size(size) -

100 , m_format(format) -

101 { -

102

}

never executed: end of block

103 -

104 -

105 /*! -

106 Virtual destructor. -

107 */ -

108 QPlatformGraphicsBuffer::~QPlatformGraphicsBuffer() -

109 { -

110 } -

111 -

112 /*! -

113 Binds the content of this graphics buffer into the currently bound texture. -

114 -

115 This function should fail for buffers not capable of locking to TextureAccess. -

116 -

117 \a rect is the subrect which is desired to be bounded to the texture. This -

118 argument has a no less than semantic, meaning more (if not all) of the buffer -

119 can be bounded to the texture. An empty QRect is interpreted as entire buffer -

120 should be bound. -

121 -

122 This function only supports binding buffers to the GL_TEXTURE_2D texture -

123 target. -

124 -

125 Returns true on success, otherwise false. -

126 */ -

127 bool QPlatformGraphicsBuffer::bindToTexture(const QRect &rect) const -

128 { -

129 Q_UNUSED(rect); -

130

return false;

never executed: return false;

131 } -

132 -

133 /*! -

134 \fn QPlatformGraphicsBuffer::AccessTypes QPlatformGraphicsBuffer::isLocked() const -

135 Function to check if the buffer is locked. -

136 -

137 \sa lock() -

138 */ -

139 -

140 /*! -

141 Before the data can be retrieved or before a buffer can be bound to a -

142 texture it needs to be locked. This is a separate function call since this -

143 operation might be time consuming, and it would not be satisfactory to do -

144 it per function call. -

145 -

146 \a access is the access type wanted. -

147 -

148 \a rect is the subrect which is desired to be locked. This -

149 argument has a no less than semantic, meaning more (if not all) of the buffer -

150 can be locked. An empty QRect is interpreted as entire buffer should be locked. -

151 -

152 Return true on successfully locking all AccessTypes specified \a access -

153 otherwise returns false and no locks have been granted. -

154 */ -

155 bool QPlatformGraphicsBuffer::lock(AccessTypes access, const QRect &rect) -

156 { -

157 bool locked = doLock(access, rect); -

158

if (locked)

locked	Description
TRUE	never evaluated
FALSE	never evaluated

159

m_lock_access |= access;

never executed: m_lock_access |= access;

160 -

161

return locked;

never executed: return locked;

162 } -

163 -

164 /*! -

165 Unlocks the current buffer lock. -

166 -

167 This function calls doUnlock, and then emits the unlocked signal with the -

168 AccessTypes from before doUnlock was called. -

169 */ -

170 void QPlatformGraphicsBuffer::unlock() -

171 { -

172

if (m_lock_access == None)

m_lock_access == None	Description
TRUE	never evaluated
FALSE	never evaluated

173

return;

never executed: return;

174 AccessTypes previous = m_lock_access; -

175 doUnlock(); -

176 m_lock_access = None; -

177 emit unlocked(previous); -

178

}

never executed: end of block

179 -

180 -

181 /*! -

182 \fn QPlatformGraphicsBuffer::doLock(AccessTypes access, const QRect &rect = QRect()) -

183 -

184 This function should be reimplemented by subclasses. If one of the \a -

185 access types specified can not be locked, then all should fail and this -

186 function should return false. -

187 -

188 \a rect is the subrect which is desired to be locked. This -

189 argument has a no less than semantic, meaning more (if not all) of the -

190 buffer can be locked. An empty QRect should be interpreted as the entire buffer -

191 should be locked. -

192 -

193 It is safe to call isLocked() to verify the current lock state. -

194 */ -

195 -

196 /*! -

197 \fn QPlatformGraphicsBuffer::doUnlock() -

198 -

199 This function should remove all locks set on the buffer. -

200 -

201 It is safe to call isLocked() to verify the current lock state. -

202 */ -

203 -

204 /*! -

205 \fn QPlatformGraphicsBuffer::unlocked(AccessTypes previousAccessTypes) -

206 -

207 Signal that is emitted after unlocked has been called. -

208 -

209 \a previousAccessTypes is the access types locked before unlock was called. -

210 */ -

211 -

212 /*! -

213 Accessor for the bytes of the buffer. This function needs to be called on a -

214 buffer with SWReadAccess access lock. Behavior is undefined for modifying -

215 the memory returned when not having a SWWriteAccess. -

216 */ -

217 const uchar *QPlatformGraphicsBuffer::data() const -

218

{

never executed: return nullptr;

return Q_NULLPTR; }

never executed: return nullptr;

219 -

220 /*! -

221 Accessor for the bytes of the buffer. This function needs to be called on a -

222 buffer with SWReadAccess access lock. Behavior is undefined for modifying -

223 the memory returned when not having a SWWriteAccess. -

224 */ -

225 uchar *QPlatformGraphicsBuffer::data() -

226 { -

227

return Q_NULLPTR;

never executed: return nullptr;

228 } -

229 -

230 /*! -

231 Accessor for the length of the data buffer. This function is a convenience -

232 function multiplying height of buffer with bytesPerLine(). -

233 -

234 \sa data() bytesPerLine() size() -

235 */ -

236 int QPlatformGraphicsBuffer::byteCount() const -

237 { -

238 Q_ASSERT(isLocked() & SWReadAccess); -

239

return size().height() * bytesPerLine();

never executed: return size().height() * bytesPerLine();

240 } -

241 -

242 /*! -

243 Accessor for bytes per line in the graphics buffer. -

244 */ -

245 int QPlatformGraphicsBuffer::bytesPerLine() const -

246 { -

247

return 0;

never executed: return 0;

248 } -

249 -

250 -

251 /*! -

252 In origin of the content of the graphics buffer. -

253 -

254 Default implementation is OriginTopLeft, as this is the coordinate -

255 system default for Qt. However, for most regular OpenGL textures -

256 this will be OriginBottomLeft. -

257 */ -

258 QPlatformGraphicsBuffer::Origin QPlatformGraphicsBuffer::origin() const -

259 { -

260

return OriginTopLeft;

never executed: return OriginTopLeft;

261 } -

262 -

263 /*! -

264 \fn QPlatformGraphicsBuffer::size() const -

265 -

266 Accessor for content size. -

267 */ -

268 -

269 /*! -

270 \fn QPlatformGraphicsBuffer::format() const -

271 -

272 Accessor for the pixel format of the buffer. -

273 */ -

274 -

275 QT_END_NAMESPACE -

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