Ejemplos de DE_SET_ALPHA en C++ (Cpp)

Ejemplo n.º 1

static void do_decode_1_4_8bit(deark *c, lctx *d, struct page_ctx *pg)
{
	struct deark_bitmap *img = NULL;
	de_int64 i, j;
	de_byte a, b;
	de_byte x;
	de_int32 fgcol;

	img = de_bitmap_create(c, pg->type_info->width, pg->type_info->height, 4);

	for(j=0; j<pg->type_info->height; j++) {
		for(i=0; i<pg->type_info->width; i++) {
			// Foreground
			b = de_get_bits_symbol(c->infile, pg->type_info->bpp, pg->image_pos + pg->rowspan*j, i);

			if(pg->type_info->bpp==8) {
				fgcol = getpal256((int)b);
			}
			else if(pg->type_info->bpp==4) {
				fgcol = pal16[(unsigned int)b];
			}
			else {
				fgcol = b ? 0x0000000 : 0xffffff;
			}

			// Opacity
			if(pg->mask_pos) {
				x = de_get_bits_symbol(c->infile, 1, pg->mask_pos + pg->mask_rowspan*j, i);
				a = x ? 0xff : 0x00;
			}
			else {
				a = 0xff;
			}
			de_bitmap_setpixel_rgba(img, i, j, DE_SET_ALPHA(fgcol, a));
		}
	}

	de_bitmap_write_to_file(img, pg->filename_token, 0);
	de_bitmap_destroy(img);
}

Ejemplo n.º 2

Archivo: tga.c Proyecto: jsummers/deark

static void do_decode_image_default(deark *c, lctx *d, struct tgaimginfo *imginfo, dbuf *unc_pixels,
	de_finfo *fi, unsigned int createflags)
{
	de_bitmap *img = NULL;
	i64 i, j;
	u8 b;
	u32 clr;
	u8 a;
	i64 rowspan;
	int output_bypp;
	unsigned int getrgbflags;
	i64 interleave_stride;
	i64 interleave_pass;
	i64 cur_rownum; // 0-based, does not account for bottom-up orientation

	if(d->pixel_depth==1) {
		de_warn(c, "1-bit TGA images are not portable, and may not be decoded correctly");
		rowspan = (imginfo->width+7)/8;
	}
	else {
		rowspan = imginfo->width*d->bytes_per_pixel;
	}

	if(d->color_type==TGA_CLRTYPE_GRAYSCALE || d->pixel_depth==1)
		output_bypp=1;
	else
		output_bypp=3;

	if(d->has_alpha_channel)
		output_bypp++;

	if(d->file_format==FMT_VST)
		getrgbflags = 0;
	else
		getrgbflags = DE_GETRGBFLAG_BGR;

	img = de_bitmap_create(c, imginfo->width, imginfo->height, output_bypp);

	switch(d->interleave_mode) {
	case 1: interleave_stride = 2; break;
	case 2: interleave_stride = 4; break;
	default: interleave_stride = 1;
	}

	cur_rownum = 0;
	interleave_pass = 0;

	for(j=0; j<imginfo->height; j++) {
		i64 j_adj;

		if(d->top_down)
			j_adj = cur_rownum;
		else
			j_adj = imginfo->height-1-cur_rownum;

		// Update the row number for next time
		cur_rownum += interleave_stride;
		if(cur_rownum >= imginfo->height) {
			// Went past the end of the image; move back to near the start.
			interleave_pass++;
			cur_rownum = interleave_pass;
		}

		for(i=0; i<imginfo->width; i++) {
			i64 i_adj;

			if(d->right_to_left)
				i_adj = imginfo->width-1-i;
			else
				i_adj = i;

			if(d->pixel_depth==1) {
				de_convert_row_bilevel(unc_pixels, j*rowspan, img, j_adj, 0);
			}
			else if(d->color_type==TGA_CLRTYPE_TRUECOLOR && (d->pixel_depth==15 || d->pixel_depth==16)) {
				clr = (u32)dbuf_getu16le(unc_pixels, j*rowspan + i*d->bytes_per_pixel);
				clr = de_rgb555_to_888(clr);
				de_bitmap_setpixel_rgb(img, i_adj, j_adj, clr);
			}
			else if(d->color_type==TGA_CLRTYPE_TRUECOLOR) {
				clr = dbuf_getRGB(unc_pixels, j*rowspan + i*d->bytes_per_pixel, getrgbflags);
				if(d->has_alpha_channel) {
					a = dbuf_getbyte(unc_pixels, j*rowspan + i*d->bytes_per_pixel+3);
					de_bitmap_setpixel_rgba(img, i_adj, j_adj, DE_SET_ALPHA(clr, a));
				}
				else {
					de_bitmap_setpixel_rgb(img, i_adj, j_adj, clr);
				}
			}
			else if(d->color_type==TGA_CLRTYPE_GRAYSCALE) {
				b = dbuf_getbyte(unc_pixels, j*rowspan + i*d->bytes_per_pixel);
				de_bitmap_setpixel_gray(img, i_adj, j_adj, b);
			}
			else if(d->color_type==TGA_CLRTYPE_PALETTE) {
				b = dbuf_getbyte(unc_pixels, j*rowspan + i*d->bytes_per_pixel);
				de_bitmap_setpixel_rgb(img, i_adj, j_adj, d->pal[(unsigned int)b]);
			}
		}
	}

	de_bitmap_write_to_file_finfo(img, fi, createflags);

	de_bitmap_destroy(img);
}