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 beginning of file */
rtgui_filerw_seek(file, 0, RTGUI_FILE_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, RTGUI_FILE_SEEK_SET);
return(is_HDC);
}
static rt_bool_t rtgui_image_png_check(struct rtgui_filerw *file)
{
int start;
rt_bool_t is_PNG;
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_PNG = RT_FALSE;
if (rtgui_filerw_read(file, magic, 1, sizeof(magic)) == sizeof(magic))
{
if (magic[0] == 0x89 &&
magic[1] == 'P' &&
magic[2] == 'N' &&
magic[3] == 'G')
{
is_PNG = RT_TRUE;
}
}
rtgui_filerw_seek(file, start, SEEK_SET);
return(is_PNG);
}
static rt_bool_t rtgui_image_bmp_check(struct rtgui_filerw* file)
{
char magic[2];
rt_bool_t is_bmp;
rt_off_t start;
if ( !file ) return 0;
start = rtgui_filerw_tell(file);
/* move to the beginning of file */
rtgui_filerw_seek(file, 0, RTGUI_FILE_SEEK_SET);
is_bmp = RT_FALSE;
if ( rtgui_filerw_read(file, magic, 1, sizeof(magic)) == sizeof(magic) )
{
if (magic[0] == 'B' &&
magic[1] == 'M')
{
is_bmp = RT_TRUE;
}
}
rtgui_filerw_seek(file, start, RTGUI_FILE_SEEK_SET);
return(is_bmp);
}
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;
hdc->hw_driver = rtgui_graphic_driver_get_default();
if (hdc->hw_driver == RT_NULL)
{
rtgui_free(hdc);
return RT_FALSE;
}
rtgui_filerw_read(file, (char *)&header, 1, sizeof(header));
/* set image information */
image->w = (rt_uint16_t)header[1];
image->h = (rt_uint16_t)header[2];
image->engine = &rtgui_image_hdc_engine;
image->data = hdc;
hdc->filerw = file;
hdc->byte_per_pixel = hdc->hw_driver->bits_per_pixel / 8;
hdc->pitch = image->w * hdc->byte_per_pixel;
hdc->pixel_offset = rtgui_filerw_tell(file);
if (load == RT_TRUE)
{
/* load all pixels */
hdc->pixels = rtgui_malloc(image->h * hdc->pitch);
if (hdc->pixels == RT_NULL)
{
/* release data */
rtgui_free(hdc);
return RT_FALSE;
}
rtgui_filerw_read(hdc->filerw, hdc->pixels, 1, image->h * hdc->pitch);
rtgui_filerw_close(hdc->filerw);
hdc->filerw = RT_NULL;
hdc->pixel_offset = 0;
}
else
{
hdc->pixels = RT_NULL;
}
return RT_TRUE;
}
static rt_bool_t rtgui_image_png_load(struct rtgui_image *image, struct rtgui_filerw *file, rt_bool_t load)
{
unsigned int width;
unsigned int height;
unsigned int error;
rt_uint8_t* pixel;
rt_uint8_t* in;
rt_uint32_t in_size;
RT_ASSERT(image != RT_NULL);
RT_ASSERT(file != RT_NULL);
rtgui_filerw_seek(file, 0, SEEK_END);
in_size = rtgui_filerw_tell(file);
in = rtgui_malloc(in_size);
if (in == RT_NULL) return RT_FALSE; /* out of memory */
rtgui_filerw_seek(file, 0, SEEK_SET);
rtgui_filerw_read(file, in, in_size, 1);
error = lodepng_decode32(&pixel, &width, &height, in, in_size);
if(error)
{
rt_kprintf("error %u: %s\n", error, lodepng_error_text(error));
rtgui_free(in);
return RT_FALSE;
}
rtgui_free(in);
/* set image information */
image->w = width;
image->h = height;
image->engine = &rtgui_image_png_engine;
image->data = pixel;
/* NOTE: the pixel format of PNG is ABGR888, bit0 R,G,B,A bit31 */
/* convert pixel to ARGB888, swap B/G */
{
rt_uint8_t* pixel_ptr;
rt_uint8_t* pixel_end;
pixel_ptr = (rt_uint8_t*) pixel;
pixel_end = pixel_ptr + width * height * 4;
while (pixel_ptr < pixel_end)
{
pixel_ptr[0] = pixel_ptr[0] ^ pixel_ptr[2];
pixel_ptr[2] = pixel_ptr[0] ^ pixel_ptr[2];
pixel_ptr[0] = pixel_ptr[0] ^ pixel_ptr[2];
pixel_ptr += 4;
}
}
/* close file handler */
rtgui_filerw_close(file);
return RT_TRUE;
}
