260 lines
6.2 KiB
C
260 lines
6.2 KiB
C
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#include "libpng/png.h"
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#include <rtthread.h>
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#include <rtgui/image_png.h>
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#include <rtgui/rtgui_system.h>
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#define PNG_MAGIC_LEN 8
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struct rtgui_image_png
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{
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rt_bool_t is_loaded;
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struct rtgui_filerw* filerw;
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/* png image information */
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png_structp png_ptr;
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png_infop info_ptr;
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rt_uint8_t *pixels;
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rt_uint8_t *line_pixels;
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};
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static rt_bool_t rtgui_image_png_check(struct rtgui_filerw* file);
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static rt_bool_t rtgui_image_png_load(struct rtgui_image* image, struct rtgui_filerw* file, rt_bool_t load);
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static void rtgui_image_png_unload(struct rtgui_image* image);
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static void rtgui_image_png_blit(struct rtgui_image* image, struct rtgui_dc* dc, struct rtgui_rect* rect);
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struct rtgui_image_engine rtgui_image_png_engine =
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{
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"png",
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{ RT_NULL },
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rtgui_image_png_check,
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rtgui_image_png_load,
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rtgui_image_png_unload,
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rtgui_image_png_blit
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};
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static void rtgui_image_png_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
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{
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struct rtgui_filerw* filerw = (struct rtgui_filerw*)png_ptr->io_ptr;
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rtgui_filerw_read(filerw, data, length, 1);
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}
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static rt_bool_t rtgui_image_png_process(png_structp png_ptr, png_infop info_ptr, struct rtgui_image_png* png)
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{
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int x, y;
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png_bytep row;
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png_bytep data;
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rtgui_color_t *ptr;
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row = (png_bytep) rtgui_malloc (png_get_rowbytes(png_ptr, info_ptr));
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if (row == RT_NULL) return RT_FALSE;
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ptr = (rtgui_color_t *)png->pixels;
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switch (info_ptr->color_type)
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{
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case PNG_COLOR_TYPE_RGBA:
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for (y = 0; y < info_ptr->height; y++)
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{
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png_read_row(png_ptr, row, png_bytep_NULL);
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for (x = 0; x < info_ptr->width; x++)
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{
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data = &(row[x * 4]);
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ptr[x+y*info_ptr->width] = RTGUI_ARGB((255 - data[3]), data[0], data[1], data[2]);
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}
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}
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break;
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case PNG_COLOR_TYPE_PALETTE:
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for (y = 0; y < info_ptr->height; y++)
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{
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png_read_row(png_ptr, row, png_bytep_NULL);
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for (x = 0; x < info_ptr->width; x++)
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{
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data = &(row[x]);
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ptr[x] = RTGUI_ARGB(0, info_ptr->palette[data[0]].red,
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info_ptr->palette[data[0]].green,
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info_ptr->palette[data[0]].blue);
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}
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}
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default:
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break;
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};
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rtgui_free(row);
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return RT_TRUE;
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}
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static rt_bool_t rtgui_image_png_check(struct rtgui_filerw* file)
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{
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int start;
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rt_bool_t is_PNG;
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rt_uint8_t magic[4];
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if ( !file ) return 0;
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start = rtgui_filerw_tell(file);
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/* move to the begining of file */
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rtgui_filerw_seek(file, 0, SEEK_SET);
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is_PNG = RT_FALSE;
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if ( rtgui_filerw_read(file, magic, 1, sizeof(magic)) == sizeof(magic) )
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{
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if ( magic[0] == 0x89 &&
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magic[1] == 'P' &&
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magic[2] == 'N' &&
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magic[3] == 'G' )
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{
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is_PNG = RT_TRUE;
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}
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}
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rtgui_filerw_seek(file, start, SEEK_SET);
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return(is_PNG);
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}
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static rt_bool_t rtgui_image_png_load(struct rtgui_image* image, struct rtgui_filerw* file, rt_bool_t load)
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{
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png_uint_32 width;
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png_uint_32 height;
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int bit_depth;
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int color_type;
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double gamma;
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struct rtgui_image_png* png;
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png = (struct rtgui_image_png*) rtgui_malloc(sizeof(struct rtgui_image_png));
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png->png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
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if (png->png_ptr == RT_NULL)
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{
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rtgui_free(png);
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return RT_FALSE;
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}
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png->info_ptr = png_create_info_struct(png->png_ptr);
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if (png->info_ptr == RT_NULL)
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{
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png_destroy_read_struct(&png->png_ptr, NULL, NULL);
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rtgui_free(png);
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return RT_FALSE;
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}
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png->filerw = file;
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png_set_read_fn (png->png_ptr, png->filerw, rtgui_image_png_read_data);
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png_read_info(png->png_ptr, png->info_ptr);
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png_get_IHDR(png->png_ptr, png->info_ptr, &width, &height, &bit_depth,
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&color_type, NULL, NULL, NULL);
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/* set image information */
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image->w = width; image->h = height;
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image->engine = &rtgui_image_png_engine;
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image->data = png;
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if (bit_depth == 16)
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png_set_strip_16(png->png_ptr);
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if (color_type == PNG_COLOR_TYPE_PALETTE)
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png_set_expand(png->png_ptr);
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if (bit_depth < 8)
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png_set_expand(png->png_ptr);
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if (png_get_valid(png->png_ptr, png->info_ptr, PNG_INFO_tRNS))
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png_set_expand(png->png_ptr);
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if (color_type == PNG_COLOR_TYPE_GRAY ||
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color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
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png_set_gray_to_rgb(png->png_ptr);
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/* Ignore background color */
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/* set gamma conversion */
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if (png_get_gAMA(png->png_ptr, png->info_ptr, &gamma))
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png_set_gamma(png->png_ptr, (double)2.2, gamma);
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png_read_update_info(png->png_ptr, png->info_ptr);
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if (load == RT_TRUE)
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{
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/* load all pixels */
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png->pixels = rtgui_malloc(image->w * image->h * sizeof(rtgui_color_t));
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png->line_pixels = RT_NULL;
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rtgui_image_png_process(png->png_ptr, png->info_ptr, png);
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}
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else
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{
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png->line_pixels = rtgui_malloc(image->w * sizeof(rtgui_color_t));
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png->pixels = RT_NULL;
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}
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}
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static void rtgui_image_png_unload(struct rtgui_image* image)
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{
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struct rtgui_image_png* png;
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if (image != RT_NULL)
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{
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png = (struct rtgui_image_png*) image->data;
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png_read_end(png->png_ptr, NULL);
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/* destroy png struct */
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png_destroy_info_struct(png->png_ptr, &png->info_ptr);
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png_destroy_read_struct(&png->png_ptr, NULL, NULL);
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if (png->pixels != RT_NULL) rtgui_free(png->pixels);
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if (png->line_pixels != RT_NULL) rtgui_free(png->line_pixels);
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/* release data */
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rtgui_free(png);
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}
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}
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static void rtgui_image_png_blit(struct rtgui_image* image, struct rtgui_dc* dc, struct rtgui_rect* rect)
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{
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rt_uint16_t x, y;
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rtgui_color_t* ptr;
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rtgui_color_t foreground;
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struct rtgui_image_png* png;
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RT_ASSERT(image != RT_NULL && dc != RT_NULL && rect != RT_NULL);
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RT_ASSERT(image->data != RT_NULL);
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png = (struct rtgui_image_png*) image->data;
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ptr = png->pixels;
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/* save foreground color */
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foreground = rtgui_dc_get_color(dc);
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/* draw each point within dc */
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for (y = 0; y < image->h; y ++)
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{
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for (x = 0; x < image->w; x++)
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{
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/* not alpha */
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if ((*ptr >> 24) != 255)
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{
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rtgui_dc_set_color(dc, *ptr);
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rtgui_dc_draw_point(dc, x + rect->x1, y + rect->y1);
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}
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/* move to next color buffer */
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ptr ++;
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}
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}
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/* restore foreground */
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rtgui_dc_set_color(dc, foreground);
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}
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void rtgui_image_png_init()
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{
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/* register jpeg on image system */
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rtgui_image_register_engine(&rtgui_image_png_engine);
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}
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