static struct rtgui_image_palette *rtgui_image_bmp_load_palette(
struct rtgui_filerw *file,
rt_uint32_t colorsUsed,
rt_bool_t alpha)
{
/* Load the palette, if any */
rt_uint32_t i;
struct rtgui_image_palette *palette;
palette = rtgui_image_palette_create(colorsUsed);
if (palette == RT_NULL)
{
return RT_NULL;
}
palette->ncolors = colorsUsed;
if (alpha)
{
rt_uint8_t temp[4];
for (i = 0; i < colorsUsed; i++)
{
if (rtgui_filerw_read(file, (void *)&temp, 1, 4) != 4)
{
rtgui_free(palette);
return RT_NULL;
}
palette->colors[i] = RTGUI_ARGB(temp[3], temp[2], temp[1], temp[0]);
}
}
else
{
rt_uint8_t temp[3];
for (i = 0; i < colorsUsed; i++)
{
if (rtgui_filerw_read(file, (void *)&temp, 1, 3) != 3)
{
rtgui_free(palette);
return RT_NULL;
}
palette->colors[i] = RTGUI_RGB(temp[2], temp[1], temp[0]);
}
}
return palette;
}
static struct rtgui_image_palette* rtgui_image_bmp_load_palette(struct rtgui_image_bmp_header* header, struct rtgui_filerw* src)
{
/* Load the palette, if any */
rt_size_t i;
struct rtgui_image_palette* palette;
if (header->biClrUsed == 0)
header->biClrUsed = 1 << header->biBitCount;
palette = rtgui_image_palette_create(header->biClrUsed);
if (palette == RT_NULL) return RT_NULL;
if ( header->biSize == 12 )
{
rt_uint8_t r, g, b;
for ( i = 0; i < (int)header->biClrUsed; ++i )
{
rtgui_filerw_read(src, &b, 1, 1);
rtgui_filerw_read(src, &g, 1, 1);
rtgui_filerw_read(src, &r, 1, 1);
palette->colors[i] = RTGUI_RGB(r, g, b);
}
}
else
{
rt_uint8_t r, g, b, a;
for ( i = 0; i < (int)header->biClrUsed; ++i )
{
rtgui_filerw_read(src, &b, 1, 1);
rtgui_filerw_read(src, &g, 1, 1);
rtgui_filerw_read(src, &r, 1, 1);
rtgui_filerw_read(src, &a, 1, 1);
palette->colors[i] = RTGUI_ARGB(a, r, g, b);
}
}
return palette;
}