* @~English * @brief Get the number and size of the image components from a DFD. * * This simplified function is for use only with the DFDs for unpacked * formats which means all components have the same size. * * @param DFD Pointer to a Data Format Descriptor to interpret, described as 32-bit words in native endianness. Note that this is the whole descriptor, not
| 36 | a component in bytes will be written. |
| 37 | */ |
| 38 | void |
| 39 | getDFDComponentInfoUnpacked(const uint32_t* DFD, uint32_t* numComponents, |
| 40 | uint32_t* componentByteLength) |
| 41 | { |
| 42 | const uint32_t *BDFDB = DFD+1; |
| 43 | uint32_t numSamples = KHR_DFDSAMPLECOUNT(BDFDB); |
| 44 | uint32_t sampleNumber; |
| 45 | uint32_t currentChannel = ~0U; /* Don't start matched. */ |
| 46 | |
| 47 | /* This is specifically for unpacked formats which means the size of */ |
| 48 | /* each component is the same. */ |
| 49 | *numComponents = 0; |
| 50 | for (sampleNumber = 0; sampleNumber < numSamples; ++sampleNumber) { |
| 51 | uint32_t sampleByteLength = (KHR_DFDSVAL(BDFDB, sampleNumber, BITLENGTH) + 1) >> 3U; |
| 52 | uint32_t sampleChannel = KHR_DFDSVAL(BDFDB, sampleNumber, CHANNELID); |
| 53 | |
| 54 | if (sampleChannel == currentChannel) { |
| 55 | /* Continuation of the same channel. */ |
| 56 | /* Accumulate the byte length. */ |
| 57 | *componentByteLength += sampleByteLength; |
| 58 | } else { |
| 59 | /* Everything is new. Hopefully. */ |
| 60 | currentChannel = sampleChannel; |
| 61 | (*numComponents)++; |
| 62 | *componentByteLength = sampleByteLength; |
| 63 | } |
| 64 | } |
| 65 | } |
| 66 | |
| 67 | /** |
| 68 | * @~English |
no outgoing calls
no test coverage detected