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This is the code we showed at Uncraftivism
Frame.cpp
- Committer:
- jarkman
- Date:
- 2009-11-20
- Revision:
- 0:57f4fdadc97f
File content as of revision 0:57f4fdadc97f:
#include "stdafx.h" #include "mbed.h" #include "ucam.h" #include "Frame.h" extern Logger pcSerial; Frame* Frame::m_frames[MAX_FRAMES]; // array of reusable frames Frame::Frame() // don't construct Frame yourself - call allocFrame instead { m_pixels = NULL; m_width = 0; m_height = 0; m_pixelFormat = 0; m_deleted = true; m_numPixels = 0; m_bad = false; } Frame::~Frame() { if( m_pixels != NULL ) free( m_pixels ); } // static - initialise the array of frames - call once at app start time void Frame::initFrames() { for( int f = 0; f < MAX_FRAMES; f ++ ) m_frames[f] = NULL; } //static - reuse an existing frame, or make a new one void Frame::allocFrame( Frame **frame, uint8_t pixelFormat, uint16_t width, uint16_t height, uint16_t frameSize ) { for( int f = 0; f < MAX_FRAMES; f ++ ) if( m_frames[f] == NULL ) { m_frames[f] = new Frame(); m_frames[f]->init( pixelFormat, width, height, frameSize ); *frame = m_frames[f]; return; } else { if( m_frames[f]->m_deleted ) { m_frames[f]->init( pixelFormat, width, height, frameSize ); *frame = m_frames[f]; return; } } pcSerial.printf("No free frames!\r\n"); *frame = NULL; } //static - make an existing frame available for reuse void Frame::releaseFrame( Frame **frame ) { for( int f = 0; f < MAX_FRAMES; f ++ ) if( m_frames[f] == *frame ) { m_frames[f]->m_deleted = true; *frame = NULL; return; } } //static - make a new frame with the same parameters as an existing one, alloc a pixel buffer, but do not initialise the pixels void Frame::cloneFrame( Frame **clone, Frame* original ) { allocFrame( clone, original->m_pixelFormat, original->m_width, original->m_height, original->m_frameSize ); } void Frame::init( uint8_t pixelFormat, uint16_t width, uint16_t height, uint32_t frameSize ) { if( m_frameSize != frameSize ) // keep the same pixel buffer if we can, to avoid fragmentation { free( m_pixels ); m_pixels = (uint8_t *) malloc( frameSize ); } m_pixelFormat = pixelFormat; m_width = width; m_height = height; m_frameSize = frameSize; m_deleted = false; m_bad = false; switch( m_pixelFormat ) { case UCAM_COLOUR_2_BIT_GREY: m_bitsPerPixel = 2; break; case UCAM_COLOUR_4_BIT_GREY: m_bitsPerPixel = 4; break; case UCAM_COLOUR_8_BIT_GREY: m_bitsPerPixel = 8; break; case UCAM_COLOUR_8_BIT_COLOUR: m_bitsPerPixel = 8; break; case UCAM_COLOUR_12_BIT_COLOR: m_bitsPerPixel = 16; break; case UCAM_COLOUR_16_BIT_COLOR: m_bitsPerPixel = 16; break; case UCAM_COLOUR_JPEG: default: m_bitsPerPixel = 16; // ?? not at all sure, but we are not using frames to handle jpegs right now break; } m_numPixels = (8 * m_frameSize) / m_bitsPerPixel; } uint16_t Frame::getPixel( uint32_t p ) { switch( m_bitsPerPixel ) { case 4: if( p & 1 ) return m_pixels[ p >> 1 ] & 0x0f; else return m_pixels[ p >> 1 ] >> 4; case 8: return m_pixels[ p ]; case 16: default: return ((m_pixels[p<<1]) << 8) + m_pixels[1 + (p<<1) ]; // todo - check bytes order } } void Frame::setPixel( uint32_t p, uint16_t val ) { switch( m_bitsPerPixel ) { case 4: if( p & 1 ) m_pixels[ p >> 1 ] = ( m_pixels[ p >> 1 ] & 0xf0) | (val & 0x0f); else m_pixels[ p >> 1 ] = ( m_pixels[ p >> 1 ] & 0x0f) | ((val & 0x0f) << 4 ); break; case 8: m_pixels[ p ] = (uint8_t) val; break; case 16: default: m_pixels[p<<1] = val>>8; m_pixels[1 + (p<<1) ] = val & 0xff; break; } } void Frame::writeToFile( char *filename ) { pcSerial.printf("writeToFile - %s\r\n", filename); FILE *rawFile = fopen(filename, FILE_WRITE_STRING); // "w" or "wb" for Windows fwrite( &m_pixelFormat, 1, 1, rawFile ); fwrite( &m_width, 1, 2, rawFile ); fwrite( &m_height, 1, 2, rawFile ); fwrite( &m_frameSize, 1, 4, rawFile ); fwrite( m_pixels, 1, m_frameSize, rawFile ); fclose( rawFile ); } // static void Frame::readFromFile( char *filename, Frame **frame ) { *frame = NULL; pcSerial.printf("readFromFile - %s\r\n", filename); FILE *rawFile = fopen(filename, FILE_READ_STRING); if( rawFile == NULL ) { pcSerial.printf("readFromFile - failed to open %s\r\n", filename); return; } uint8_t pixelFormat; uint16_t width; uint16_t height; uint32_t frameSize; if( 1 == fread( &pixelFormat, 1, 1, rawFile )) if( 2 == fread( &width, 1, 2, rawFile )) if( 2 == fread( &height, 1, 2, rawFile )) if( 4 == fread( &frameSize, 1, 4, rawFile )) { allocFrame( frame, pixelFormat, width, height, frameSize ); if( frameSize != fread( (*frame)->m_pixels, 1, frameSize, rawFile )) { releaseFrame( frame ); pcSerial.printf("readFromFile - bad size"); } } fclose( rawFile ); }