static void do_bitmap(deark *c, lctx *d, dbuf *unc_pixels)
{
i64 i, j;
i64 rowspan;
u32 clr;
de_bitmap *img = NULL;
u8 b;
rowspan = (d->w * d->bpp +7)/8;
img = de_bitmap_create(c, d->w, d->h, 3);
for(j=0; j<d->h; j++) {
for(i=0; i<d->w; i++) {
if(d->bpp<=8) {
b = de_get_bits_symbol(unc_pixels, d->bpp, j*rowspan, i);
clr = d->pal[(unsigned int)b];
}
else {
clr = dbuf_getRGB(unc_pixels, j*rowspan + i*3, 0);
}
de_bitmap_setpixel_rgb(img, i, j, clr);
}
}
de_bitmap_write_to_file(img, NULL, 0);
de_bitmap_destroy(img);
}
static int do_read_palette(deark *c, lctx *d, i64 pos)
{
i64 i;
i64 idx;
unsigned int getrgbflags;
if(d->color_type != TGA_CLRTYPE_PALETTE) {
return 1; // don't care about the palette
}
if(d->cmap_depth != 24) {
de_err(c, "Palettes with depth=%d are not supported.", (int)d->cmap_depth);
return 0;
}
if(d->pixel_depth != 8) {
de_err(c, "Paletted images with depth=%d are not supported.", (int)d->pixel_depth);
return 0;
}
if(d->file_format==FMT_VST)
getrgbflags = 0;
else
getrgbflags = DE_GETRGBFLAG_BGR;
for(i=0; i<d->cmap_length; i++) {
idx = d->cmap_start + i;
if(idx<0 || idx>255) continue;
d->pal[idx] = dbuf_getRGB(c->infile, pos + i*d->bytes_per_pal_entry, getrgbflags);
de_dbg_pal_entry(c, idx, d->pal[idx]);
}
return 1;
}
static void do_image_24bit(deark *c, lctx *d, dbuf *bits, de_int64 bits_offset)
{
struct deark_bitmap *img = NULL;
de_int64 i, j;
de_uint32 clr;
img = bmp_bitmap_create(c, d, 3);
for(j=0; j<d->height; j++) {
for(i=0; i<d->width; i++) {
clr = dbuf_getRGB(bits, bits_offset + j*d->rowspan + 3*i, DE_GETRGBFLAG_BGR);
de_bitmap_setpixel_rgb(img, i, j, clr);
}
}
de_bitmap_write_to_file(img, NULL, 0);
de_bitmap_destroy(img);
}
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);
}
