I stand corrected.

-----Original Message-----
From: Robert Murrell [mailto:community-noreply@qnx.com] 
Sent: November 8, 2010 12:11 PM
To: advanced-graphics
Subject: Re: RE: RE: How to display an image.

No.  BMP files come in IMG_FMT_PAL1, IMG_FMT_PAL4, and IMG_FMT_PAL8
flavors.  As I remember, GIF files are only IMG_FMT_PAL8.




_______________________________________________

Advanced Graphics
http://community.qnx.com/sf/go/post73896

Ok, I think I know the issue, the is not GF_FORMAT_PAL1, only PAL8, so
the call errors out.

My best suggestion would be to force the output format in the img_t
before call img_load_file().

img.format = IMG_FMT_BGRA8888;
img.flags |= IMG_FORMAT;

stats = img_load_file(ilib, fname, NULL, &img);

See it that makes it work better ...


-----Original Message-----
From: Robert Murrell [mailto:community-noreply@qnx.com] 
Sent: November 8, 2010 12:16 PM
To: advanced-graphics
Subject: Re: RE: RE: How to display an image.

This code is basically the sample code snippets from the Users Guide
strung together with some guesses added to get it to compile.

void DRAW::DrawImg(char *fname)
{
	int stats;
	img_lib_t ilib = NULL;
	img_t img;
	gf_palette_t palette;
	gf_surface_t img_surf;

	img.flags = 0;

	if ((stats = img_lib_attach(&ilib)) == IMG_ERR_OK) {
		stats = img_load_file(ilib, fname, NULL, &img);
		img_lib_detach(ilib);

		if (img.format & IMG_FMT_PALETTE) {
			/* setup palette if necessary */
			palette.ncolors = img.npalette;
			palette.colors = img.palette;
		} else if (img.format == IMG_FMT_G8) {
			/* we can render G8 images in GF by using a
palette of grays */
			palette.ncolors = 256;
			palette.colors = (img_color_t*)g8pal;
		}
		if ((stats = gf_surface_attach(&img_surf, gdev,
		        img.w, img.h, img.access.direct.stride,
(gf_format_t)img.format,
		        &palette, img.access.direct.data, 0)) ==
GF_ERR_OK) {

			if (img.flags & IMG_TRANSPARENCY) {
			        /* we can handle transparency in GF
using chroma */

				gf_chroma_t        chroma;
				memset(&chroma, 0, sizeof chroma);
				chroma.mode = GF_CHROMA_OP_SRC_MATCH |
GF_CHROMA_OP_NO_DRAW;
				if (img.format & IMG_FMT_PALETTE) {
						chroma.color0 =
img.palette[img.transparency.index];
				} else if (IMG_FMT_BPP(img.format) < 24)
{
						chroma.color0 =
img.transparency.rgb16;
				} else {
						chroma.color0 =
img.transparency.rgb32;
				}

				gf_context_set_chroma(context, &chroma);
			}

			if (img.format & IMG_FMT_ALPHA) {
				gf_alpha_t        alpha;
				memset(&alpha, 0, sizeof alpha);
				alpha.mode = GF_ALPHA_M1_SRC_PIXEL_ALPHA
| GF_BLEND_SRC_M1 |
					GF_BLEND_DST_1mM1;
				gf_context_set_alpha(context, &alpha);
			}
			stats = gf_draw_begin( context );
			//render image on a surface
			gf_draw_blit2(context, img_surf, NULL,
					0, 0, img.w - 1, img.h - 1,
Pen.X, Pen.Y);

			gf_draw_finish(context);

			/* unlock the h/w */
			gf_draw_end(context);

			if (img.format & IMG_FMT_ALPHA) {
			        gf_context_disable_alpha(context);
			}

			if (img.flags & IMG_TRANSPARENCY) {
			        gf_context_disable_chroma(context);
			}

			/* release the attached surface; we're not going
to blit from it any
			   more (in real life this surface could be
recycled if needed) */
			gf_surface_free(img_surf);

			free(img.access.direct.data);
		}
	}
	if (stats) {
		printf("Image error: %d\n", stats);//debug
	}
}




_______________________________________________

Advanced Graphics
http://community.qnx.com/sf/go/post73898