diff options
Diffstat (limited to 'src/bitmap.c')
| -rw-r--r-- | src/bitmap.c | 69 |
1 files changed, 60 insertions, 9 deletions
diff --git a/src/bitmap.c b/src/bitmap.c index c64a4c0..6d72cb0 100644 --- a/src/bitmap.c +++ b/src/bitmap.c @@ -30,7 +30,7 @@ static uint32_t bitmap_flip_byte(unsigned char* _v, int _c) int bitmap_read(char *_file, struct bitmap_image *_bitmap) { - if (!_bitmap ) + if ( !_bitmap ) return 5; struct bitmap_file_header header; @@ -176,6 +176,7 @@ static struct bitmap_image bitmap_read_pixel_data(FILE *_file, struct bitmap_fil } int bitmap_copy ( struct bitmap_image *_input, struct bitmap_image *_output ) { + // TODO implement return 1; } @@ -183,10 +184,7 @@ int bitmap_convert_monochrome ( struct bitmap_image *_input, struct bitmap_image if ( !_input || !_output ) return 1; - uint8_t **monochrome_bitmap = malloc( sizeof (*monochrome_bitmap) * _input->x ); - for ( int i = 0; i < _input->y; i++ ) { - monochrome_bitmap[i] = malloc ( sizeof (**monochrome_bitmap) * _input->y ); - } + uint8_t **monochrome_bitmap = (uint8_t**) dynalloc_2d_array( _input->x, _input->y, sizeof(uint8_t)); for ( unsigned int x = 0; x < _input->x; x++ ) { for ( unsigned int y = 0; y < _input->y; y++ ) { @@ -198,16 +196,69 @@ int bitmap_convert_monochrome ( struct bitmap_image *_input, struct bitmap_image } _output->R = _output->G = _output->B = monochrome_bitmap; + _output->tags = BITMAP_MONOCHROME; + _output->x = _input->x; + _output->y = _input->y; + //TODO min/max brightness return 0; } -int bitmap_transform ( struct bitmap_image *_input, struct bitmap_image *_output ) { - return 1; +int bitmap_shrink ( struct bitmap_image *_input, struct bitmap_image *_output, unsigned int _factor_x, unsigned int _factor_y ) { + if ( !_input || !_output ) + return 1; + + /* New Size */ + _output->x = _input->x / _factor_x; + _output->y = _input->y / _factor_y; + _output->tags = _input->tags; + + /* Allocate memory */ + if ( _input->tags & BITMAP_MONOCHROME ) { + _output->R = _output->G = _output->B = + (uint8_t**) dynalloc_2d_array ( _output->x, _output->y, sizeof ( uint8_t) ); + } else { + _output->R = (uint8_t**) dynalloc_2d_array ( _output->x, _output->y, sizeof ( uint8_t) ); + _output->G = (uint8_t**) dynalloc_2d_array ( _output->x, _output->y, sizeof ( uint8_t) ); + _output->B = (uint8_t**) dynalloc_2d_array ( _output->x, _output->y, sizeof ( uint8_t) ); + } + + for(unsigned int x = 0; x < _output->x; x++) { + for(unsigned int y = 0; y < _output->y; y++) { + // Unsafe for > 2^56 Pixels (Hopefully unrealistic) + uint64_t color_sum[3] = {0,0,0}; + const uint64_t pixel_count = _factor_x * _factor_y; + + // Average Pixel block + for(unsigned int row_c = 0; row_c < _factor_y; row_c++) { + unsigned int row = y * _factor_y + row_c; //Offset + + for(unsigned int col_c = 0; col_c < _factor_x; col_c++) { + unsigned int col = x * _factor_x + col_c; //Offset + + color_sum[0] += (uint64_t) _input->R[col][row]; + color_sum[1] += (uint64_t) _input->G[col][row]; + color_sum[2] += (uint64_t) _input->B[col][row]; + }//for col_c + }//for row_c + + _output->R[x][y] = (uint8_t) (color_sum[0] / pixel_count); + _output->G[x][y] = (uint8_t) (color_sum[1] / pixel_count); + _output->B[x][y] = (uint8_t) (color_sum[2] / pixel_count); + }//for y + }//for x + + return 0; } -static uint8_t bitmap_rgb_luminance(uint8_t R, uint8_t G, uint8_t B) -{ +int bitmap_fit_to_width ( struct bitmap_image *_input, struct bitmap_image *_output, unsigned int _width ) { + unsigned int factor_x = (unsigned int)((float)_input->x / (float) _width ); + unsigned int factor_y = (unsigned int)(((float)_input->y / (float)_input->x ) * (float) factor_x * 2); + + return bitmap_shrink ( _input, _output, factor_x, factor_y ); +} + +static uint8_t bitmap_rgb_luminance(uint8_t R, uint8_t G, uint8_t B) { uint8_t ret; ret = sqrt( 0.299*pow(R,2) + 0.587*pow(G,2) + 0.114*pow(B,2) ); //(char)(R+R+B+G+G+G)/6; |