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- #include "libpng/png.h"
- #include <rtthread.h>
- #include <rtgui/image_hdc.h>
- #include <rtgui/rtgui_system.h>
- #define HDC_MAGIC_LEN 4
- struct rtgui_image_hdc
- {
- rt_bool_t is_loaded;
- struct rtgui_filerw* filerw;
- /* hdc image information */
- rt_uint32_t width, height;
- rt_uint32_t pitch;
- rt_uint8_t *pixels;
- };
- static rt_bool_t rtgui_image_hdc_check(struct rtgui_filerw* file);
- static rt_bool_t rtgui_image_hdc_load(struct rtgui_image* image, struct rtgui_filerw* file, rt_bool_t load);
- static void rtgui_image_hdc_unload(struct rtgui_image* image);
- static void rtgui_image_hdc_blit(struct rtgui_image* image, struct rtgui_dc* dc, struct rtgui_rect* rect);
- struct rtgui_image_engine rtgui_image_hdc_engine =
- {
- "hdc",
- { RT_NULL },
- rtgui_image_hdc_check,
- rtgui_image_hdc_load,
- rtgui_image_hdc_unload,
- rtgui_image_hdc_blit
- };
- static rt_bool_t rtgui_image_hdc_check(struct rtgui_filerw* file)
- {
- int start;
- rt_bool_t is_HDC;
- rt_uint8_t magic[4];
- if ( !file ) return 0;
- start = rtgui_filerw_tell(file);
- /* move to the begining of file */
- rtgui_filerw_seek(file, 0, SEEK_SET);
- is_HDC = RT_FALSE;
- if ( rtgui_filerw_read(file, magic, 1, sizeof(magic)) == sizeof(magic) )
- {
- if ( magic[0] == 'H' &&
- magic[1] == 'D' &&
- magic[2] == 'C' &&
- magic[3] == '\0' )
- {
- is_HDC = RT_TRUE;
- }
- }
- rtgui_filerw_seek(file, start, SEEK_SET);
- return(is_HDC);
- }
- static rt_bool_t rtgui_image_hdc_load(struct rtgui_image* image, struct rtgui_filerw* file, rt_bool_t load)
- {
- rt_uint32_t header[5];
- struct rtgui_image_hdc* hdc;
- hdc = (struct rtgui_image_hdc*) rtgui_malloc(sizeof(struct rtgui_image_hdc));
- if (hdc == RT_NULL) return RT_FALSE;
- rtgui_filerw_read(file, (char*)&header, 1, sizeof(header));
- /* set image information */
- image->w = header[1]; image->h = header[2];
- image->engine = &rtgui_image_hdc_engine;
- image->data = png;
- if (bit_depth == 16)
- png_set_strip_16(png->png_ptr);
- if (color_type == PNG_COLOR_TYPE_PALETTE)
- png_set_expand(png->png_ptr);
- if (bit_depth < 8)
- png_set_expand(png->png_ptr);
- if (png_get_valid(png->png_ptr, png->info_ptr, PNG_INFO_tRNS))
- png_set_expand(png->png_ptr);
- if (color_type == PNG_COLOR_TYPE_GRAY ||
- color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
- png_set_gray_to_rgb(png->png_ptr);
- /* Ignore background color */
- /* set gamma conversion */
- if (png_get_gAMA(png->png_ptr, png->info_ptr, &gamma))
- png_set_gamma(png->png_ptr, (double)2.2, gamma);
- png_read_update_info(png->png_ptr, png->info_ptr);
- if (load == RT_TRUE)
- {
- /* load all pixels */
- png->pixels = rtgui_malloc(image->w * image->h * sizeof(rtgui_color_t));
- if (png->pixels == RT_NULL)
- {
- png_read_end(png->png_ptr, RT_NULL);
- /* destroy png struct */
- png_destroy_info_struct(png->png_ptr, &png->info_ptr);
- png_destroy_read_struct(&png->png_ptr, RT_NULL, RT_NULL);
- /* release data */
- rtgui_free(png);
- return RT_FALSE;
- }
- rtgui_image_hdc_process(png->png_ptr, png->info_ptr, png);
- }
- else
- {
- png->pixels = RT_NULL;
- }
- return RT_TRUE;
- }
- static void rtgui_image_hdc_unload(struct rtgui_image* image)
- {
- struct rtgui_image_hdc* png;
- if (image != RT_NULL)
- {
- png = (struct rtgui_image_hdc*) image->data;
- png_read_end(png->png_ptr, RT_NULL);
- /* destroy png struct */
- png_destroy_info_struct(png->png_ptr, &png->info_ptr);
- png_destroy_read_struct(&png->png_ptr, RT_NULL, RT_NULL);
- if (png->pixels != RT_NULL) rtgui_free(png->pixels);
- /* release data */
- rtgui_free(png);
- }
- }
- static void rtgui_image_hdc_blit(struct rtgui_image* image, struct rtgui_dc* dc, struct rtgui_rect* rect)
- {
- rt_uint16_t x, y, w, h;
- rtgui_color_t* ptr;
- rtgui_color_t foreground;
- struct rtgui_image_hdc* png;
- RT_ASSERT(image != RT_NULL && dc != RT_NULL && rect != RT_NULL);
- RT_ASSERT(image->data != RT_NULL);
- png = (struct rtgui_image_hdc*) image->data;
- if (image->w < rtgui_rect_width(*rect)) w = image->w;
- else w = rtgui_rect_width(*rect);
- if (image->h < rtgui_rect_height(*rect)) h = image->h;
- else h = rtgui_rect_height(*rect);
- /* save foreground color */
- foreground = rtgui_dc_get_color(dc);
- if (png->pixels != RT_NULL)
- {
- ptr = (rtgui_color_t*)png->pixels;
- /* draw each point within dc */
- for (y = 0; y < h; y ++)
- {
- for (x = 0; x < w; x++)
- {
- /* not alpha */
- if ((*ptr >> 24) != 255)
- {
- rtgui_dc_set_color(dc, *ptr);
- rtgui_dc_draw_point(dc, x + rect->x1, y + rect->y1);
- }
- /* move to next color buffer */
- ptr ++;
- }
- }
- }
- else
- {
- png_bytep row;
- png_bytep data;
- row = (png_bytep) rtgui_malloc (png_get_rowbytes(png->png_ptr, png->info_ptr));
- if (row == RT_NULL) return ;
- switch (png->info_ptr->color_type)
- {
- case PNG_COLOR_TYPE_RGBA:
- for (y = 0; y < h; y++)
- {
- png_read_row(png->png_ptr, row, png_bytep_NULL);
- for (x = 0; x < w; x++)
- {
- data = &(row[x * 4]);
- if (data[3] != 0)
- {
- rtgui_dc_set_color(dc, RTGUI_ARGB((255 - data[3]), data[0], data[1], data[2]));
- rtgui_dc_draw_point(dc, x + rect->x1, y + rect->y1);
- }
- }
- }
- break;
- case PNG_COLOR_TYPE_PALETTE:
- for (y = 0; y < h; y++)
- {
- png_read_row(png->png_ptr, row, png_bytep_NULL);
- for (x = 0; x < w; x++)
- {
- data = &(row[x]);
- rtgui_dc_set_color(dc, RTGUI_ARGB(0, png->info_ptr->palette[data[0]].red,
- png->info_ptr->palette[data[0]].green,
- png->info_ptr->palette[data[0]].blue));
- rtgui_dc_draw_point(dc, x + rect->x1, y + rect->y1);
- }
- }
- default:
- break;
- };
- rtgui_free(row);
- }
- /* restore foreground */
- rtgui_dc_set_color(dc, foreground);
- }
- void rtgui_image_hdc_init()
- {
- /* register png on image system */
- rtgui_image_register_engine(&rtgui_image_hdc_engine);
- }
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