/* exported interface documented in image_cache.h */
nserror image_cache_add(struct content *content,
struct bitmap *bitmap,
image_cache_convert_fn *convert)
{
struct image_cache_entry_s *centry;
/* bump the cache age by a ms to ensure multiple items are not
* added at exactly the same time
*/
image_cache->current_age++;
centry = image_cache__find(content);
if (centry == NULL) {
/* new cache entry, content not previously added */
centry = calloc(1, sizeof(struct image_cache_entry_s));
if (centry == NULL) {
return NSERROR_NOMEM;
}
image_cache__link(centry);
centry->content = content;
centry->bitmap_size = content->width * content->height * 4;
}
LOG(("centry %p, content %p, bitmap %p", centry, content, bitmap));
centry->convert = convert;
/* set bitmap entry if one is passed, free extant one if present */
if (bitmap != NULL) {
if (centry->bitmap != NULL) {
bitmap_destroy(centry->bitmap);
} else {
image_cache_stats_bitmap_add(centry);
}
centry->bitmap = bitmap;
} else {
/* no bitmap, check to see if we should speculatively convert */
if ((centry->convert != NULL) &&
(image_cache_speculate(content) == true)) {
centry->bitmap = centry->convert(centry->content);
if (centry->bitmap != NULL) {
image_cache_stats_bitmap_add(centry);
} else {
image_cache->fail_count++;
}
}
}
return NSERROR_OK;
}
/**
* info_callback -- PNG header has been completely received, prepare to process
* image data
*/
static void info_callback(png_structp png_s, png_infop info)
{
int interlace;
png_uint_32 width, height;
nspng_content *png_c = png_get_progressive_ptr(png_s);
width = png_get_image_width(png_s, info);
height = png_get_image_height(png_s, info);
interlace = png_get_interlace_type(png_s, info);
png_c->base.width = width;
png_c->base.height = height;
png_c->base.size += width * height * 4;
/* see if progressive-conversion should continue */
if (image_cache_speculate((struct content *)png_c) == false) {
longjmp(png_jmpbuf(png_s), CBERR_NOPRE);
}
/* Claim the required memory for the converted PNG */
png_c->bitmap = bitmap_create(width, height, BITMAP_NEW);
if (png_c->bitmap == NULL) {
/* Failed to create bitmap skip pre-conversion */
longjmp(png_jmpbuf(png_s), CBERR_NOPRE);
}
png_c->rowstride = bitmap_get_rowstride(png_c->bitmap);
png_c->bpp = bitmap_get_bpp(png_c->bitmap);
nspng_setup_transforms(png_s, info);
png_c->rowbytes = png_get_rowbytes(png_s, info);
png_c->interlace = (interlace == PNG_INTERLACE_ADAM7);
LOG(("size %li * %li, rowbytes %zu", (unsigned long)width,
(unsigned long)height, png_c->rowbytes));
}
