diff options
Diffstat (limited to 'fb2png/img_process.c')
| -rw-r--r-- | fb2png/img_process.c | 254 |
1 files changed, 254 insertions, 0 deletions
diff --git a/fb2png/img_process.c b/fb2png/img_process.c new file mode 100644 index 000000000..eb75e9a21 --- /dev/null +++ b/fb2png/img_process.c @@ -0,0 +1,254 @@ +/* + * -- http://android-fb2png.googlecode.com/svn/trunk/img_process.c -- + * + * Copyright 2011, Kyan He <kyan.ql.he@gmail.com> + * + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <errno.h> +#include <png.h> + +#include "img_process.h" +#include "log.h" + +int rgb565_to_rgb888(const char* src, char* dst, size_t pixel) +{ + struct rgb565 *from; + struct rgb888 *to; + + from = (struct rgb565 *) src; + to = (struct rgb888 *) dst; + + int i = 0; + /* traverse pixel of the row */ + while(i++ < pixel) { + + to->r = from->r; + to->g = from->g; + to->b = from->b; + /* scale */ + to->r <<= 3; + to->g <<= 2; + to->b <<= 3; + + to++; + from++; + } + + return 0; +} + +int argb8888_to_rgb888(const char* src, char* dst, size_t pixel) +{ + int i; + struct argb8888 *from; + struct rgb888 *to; + + from = (struct argb8888 *) src; + to = (struct rgb888 *) dst; + + i = 0; + /* traverse pixel of the row */ + while(i++ < pixel) { + + to->r = from->r; + to->g = from->g; + to->b = from->b; + + to++; + from++; + } + + return 0; +} + +int abgr8888_to_rgb888(const char* src, char* dst, size_t pixel) +{ + int i; + struct abgr8888 *from; + struct rgb888 *to; + + from = (struct abgr8888 *) src; + to = (struct rgb888 *) dst; + + i = 0; + /* traverse pixel of the row */ + while(i++ < pixel) { + + to->r = from->r; + to->g = from->g; + to->b = from->b; + + to++; + from++; + } + + return 0; +} + +int bgra8888_to_rgb888(const char* src, char* dst, size_t pixel) +{ + int i; + struct bgra8888 *from; + struct rgb888 *to; + + from = (struct bgra8888 *) src; + to = (struct rgb888 *) dst; + + i = 0; + /* traverse pixel of the row */ + while(i++ < pixel) { + + to->r = from->r; + to->g = from->g; + to->b = from->b; + + to++; + from++; + } + + return 0; +} + +int rgba8888_to_rgb888(const char* src, char* dst, size_t pixel) +{ + int i; + struct rgba8888 *from; + struct rgb888 *to; + + from = (struct rgba8888 *) src; + to = (struct rgb888 *) dst; + + i = 0; + /* traverse pixel of the row */ + while(i++ < pixel) { + + to->r = from->r; + to->g = from->g; + to->b = from->b; + + to++; + from++; + } + + return 0; +} + +static void +stdio_write_func (png_structp png, png_bytep data, png_size_t size) +{ + FILE *fp; + size_t ret; + + fp = png_get_io_ptr (png); + while (size) { + ret = fwrite (data, 1, size, fp); + size -= ret; + data += ret; + if (size && ferror (fp)) + E("write: %m\n"); + } +} + +static void +png_simple_output_flush_fn (png_structp png_ptr) +{ +} + +static void +png_simple_error_callback (png_structp png, + png_const_charp error_msg) +{ + E("png error: %s\n", error_msg); +} + +static void +png_simple_warning_callback (png_structp png, + png_const_charp error_msg) +{ + fprintf(stderr, "png warning: %s\n", error_msg); +} + +/* save rgb888 to png format in fp */ +int save_png(const char* path, const char* data, int width, int height) +{ + FILE *fp; + png_byte **volatile rows; + png_struct *png; + png_info *info; + + fp = fopen(path, "w"); + if (!fp) { + int errsv = errno; + E("Cannot open file %s for writing.\n", path); + return errsv; + } + + rows = malloc(height * sizeof rows[0]); + if (!rows) goto oops; + + int i; + for (i = 0; i < height; i++) + rows[i] = (png_byte *) data + i * width * 3 /*fb.stride*/; + + png = png_create_write_struct (PNG_LIBPNG_VER_STRING, NULL, + png_simple_error_callback, + png_simple_warning_callback); + if (!png) { + E("png_create_write_struct failed\n"); + goto oops; + } + + info = png_create_info_struct (png); + if (!info) { + E("png_create_info_struct failed\n"); + png_destroy_write_struct (&png, NULL); + goto oops; + } + + png_set_write_fn (png, fp, stdio_write_func, png_simple_output_flush_fn); + png_set_IHDR (png, info, + width, + height, +#define DEPTH 8 + DEPTH, + PNG_COLOR_TYPE_RGB, + PNG_INTERLACE_NONE, + PNG_COMPRESSION_TYPE_DEFAULT, + PNG_FILTER_TYPE_DEFAULT); + + png_color_16 white; + + white.gray = (1 << DEPTH) - 1; + white.red = white.blue = white.green = white.gray; + + png_set_bKGD (png, info, &white); + png_write_info (png, info); + + png_write_image (png, rows); + png_write_end (png, info); + + png_destroy_write_struct (&png, &info); + + fclose(fp); + free (rows); + return 0; + +oops: + fclose(fp); + free (rows); + return -1; +} |