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#include "mupdf/fitz.h"
fz_pixmap *
fz_new_pixmap_from_image(fz_context *ctx, fz_image *image, int w, int h)
{
if (image == NULL)
return NULL;
return image->get_pixmap(ctx, image, w, h);
}
fz_image *
fz_keep_image(fz_context *ctx, fz_image *image)
{
return (fz_image *)fz_keep_storable(ctx, &image->storable);
}
void
fz_drop_image(fz_context *ctx, fz_image *image)
{
fz_drop_storable(ctx, &image->storable);
}
typedef struct fz_image_key_s fz_image_key;
struct fz_image_key_s {
int refs;
fz_image *image;
int l2factor;
};
static int
fz_make_hash_image_key(fz_store_hash *hash, void *key_)
{
fz_image_key *key = (fz_image_key *)key_;
hash->u.pi.ptr = key->image;
hash->u.pi.i = key->l2factor;
return 1;
}
static void *
fz_keep_image_key(fz_context *ctx, void *key_)
{
fz_image_key *key = (fz_image_key *)key_;
fz_lock(ctx, FZ_LOCK_ALLOC);
key->refs++;
fz_unlock(ctx, FZ_LOCK_ALLOC);
return (void *)key;
}
static void
fz_drop_image_key(fz_context *ctx, void *key_)
{
fz_image_key *key = (fz_image_key *)key_;
int drop;
if (key == NULL)
return;
fz_lock(ctx, FZ_LOCK_ALLOC);
drop = --key->refs;
fz_unlock(ctx, FZ_LOCK_ALLOC);
if (drop == 0)
{
fz_drop_image(ctx, key->image);
fz_free(ctx, key);
}
}
static int
fz_cmp_image_key(void *k0_, void *k1_)
{
fz_image_key *k0 = (fz_image_key *)k0_;
fz_image_key *k1 = (fz_image_key *)k1_;
return k0->image == k1->image && k0->l2factor == k1->l2factor;
}
#ifndef NDEBUG
static void
fz_debug_image(FILE *out, void *key_)
{
fz_image_key *key = (fz_image_key *)key_;
fprintf(out, "(image %d x %d sf=%d) ", key->image->w, key->image->h, key->l2factor);
}
#endif
static fz_store_type fz_image_store_type =
{
fz_make_hash_image_key,
fz_keep_image_key,
fz_drop_image_key,
fz_cmp_image_key,
#ifndef NDEBUG
fz_debug_image
#endif
};
static void
fz_mask_color_key(fz_pixmap *pix, int n, int *colorkey)
{
unsigned char *p = pix->samples;
int len = pix->w * pix->h;
int k, t;
while (len--)
{
t = 1;
for (k = 0; k < n; k++)
if (p[k] < colorkey[k * 2] || p[k] > colorkey[k * 2 + 1])
t = 0;
if (t)
for (k = 0; k < pix->n; k++)
p[k] = 0;
p += pix->n;
}
}
fz_pixmap *
fz_decomp_image_from_stream(fz_context *ctx, fz_stream *stm, fz_image *image, int in_line, int indexed, int l2factor, int native_l2factor)
{
fz_pixmap *tile = NULL;
int stride, len, i;
unsigned char *samples = NULL;
int f = 1<<native_l2factor;
int w = (image->w + f-1) >> native_l2factor;
int h = (image->h + f-1) >> native_l2factor;
fz_var(tile);
fz_var(samples);
fz_try(ctx)
{
tile = fz_new_pixmap(ctx, image->colorspace, w, h);
tile->interpolate = image->interpolate;
stride = (w * image->n * image->bpc + 7) / 8;
samples = fz_malloc_array(ctx, h, stride);
len = fz_read(stm, samples, h * stride);
/* Make sure we read the EOF marker (for inline images only) */
if (in_line)
{
unsigned char tbuf[512];
fz_try(ctx)
{
int tlen = fz_read(stm, tbuf, sizeof tbuf);
if (tlen > 0)
fz_warn(ctx, "ignoring garbage at end of image");
}
fz_catch(ctx)
{
fz_rethrow_if(ctx, FZ_ERROR_TRYLATER);
fz_warn(ctx, "ignoring error at end of image");
}
}
/* Pad truncated images */
if (len < stride * h)
{
fz_warn(ctx, "padding truncated image");
memset(samples + len, 0, stride * h - len);
}
/* Invert 1-bit image masks */
if (image->imagemask)
{
/* 0=opaque and 1=transparent so we need to invert */
unsigned char *p = samples;
len = h * stride;
for (i = 0; i < len; i++)
p[i] = ~p[i];
}
fz_unpack_tile(tile, samples, image->n, image->bpc, stride, indexed);
fz_free(ctx, samples);
samples = NULL;
if (image->usecolorkey)
fz_mask_color_key(tile, image->n, image->colorkey);
if (indexed)
{
fz_pixmap *conv;
fz_decode_indexed_tile(tile, image->decode, (1 << image->bpc) - 1);
conv = fz_expand_indexed_pixmap(ctx, tile);
fz_drop_pixmap(ctx, tile);
tile = conv;
}
else
{
fz_decode_tile(tile, image->decode);
}
}
fz_always(ctx)
{
fz_close(stm);
}
fz_catch(ctx)
{
if (tile)
fz_drop_pixmap(ctx, tile);
fz_free(ctx, samples);
fz_rethrow(ctx);
}
/* Now apply any extra subsampling required */
if (l2factor - native_l2factor > 0)
{
if (l2factor - native_l2factor > 8)
l2factor = native_l2factor + 8;
fz_subsample_pixmap(ctx, tile, l2factor - native_l2factor);
}
return tile;
}
void
fz_free_image(fz_context *ctx, fz_storable *image_)
{
fz_image *image = (fz_image *)image_;
if (image == NULL)
return;
fz_drop_pixmap(ctx, image->tile);
fz_free_compressed_buffer(ctx, image->buffer);
fz_drop_colorspace(ctx, image->colorspace);
fz_drop_image(ctx, image->mask);
fz_free(ctx, image);
}
fz_pixmap *
fz_image_get_pixmap(fz_context *ctx, fz_image *image, int w, int h)
{
fz_pixmap *tile;
fz_stream *stm;
int l2factor;
fz_image_key key;
int native_l2factor;
int indexed;
fz_image_key *keyp;
/* Check for 'simple' images which are just pixmaps */
if (image->buffer == NULL)
{
tile = image->tile;
if (!tile)
return NULL;
return fz_keep_pixmap(ctx, tile); /* That's all we can give you! */
}
/* Ensure our expectations for tile size are reasonable */
if (w > image->w)
w = image->w;
if (h > image->h)
h = image->h;
/* What is our ideal factor? */
if (w == 0 || h == 0)
l2factor = 0;
else
for (l2factor=0; image->w>>(l2factor+1) >= w && image->h>>(l2factor+1) >= h && l2factor < 8; l2factor++);
/* Can we find any suitable tiles in the cache? */
key.refs = 1;
key.image = image;
key.l2factor = l2factor;
do
{
tile = fz_find_item(ctx, fz_free_pixmap_imp, &key, &fz_image_store_type);
if (tile)
return tile;
key.l2factor--;
}
while (key.l2factor >= 0);
/* We need to make a new one. */
/* First check for ones that we can't decode using streams */
switch (image->buffer->params.type)
{
case FZ_IMAGE_PNG:
tile = fz_load_png(ctx, image->buffer->buffer->data, image->buffer->buffer->len);
break;
case FZ_IMAGE_TIFF:
tile = fz_load_tiff(ctx, image->buffer->buffer->data, image->buffer->buffer->len);
break;
case FZ_IMAGE_JXR:
fz_throw(ctx, FZ_ERROR_GENERIC, "JPEG-XR codec is not available");
break;
default:
native_l2factor = l2factor;
stm = fz_open_image_decomp_stream(ctx, image->buffer, &native_l2factor);
indexed = fz_colorspace_is_indexed(image->colorspace);
tile = fz_decomp_image_from_stream(ctx, stm, image, 0, indexed, l2factor, native_l2factor);
/* CMYK JPEGs in XPS documents have to be inverted */
if (image->invert_cmyk_jpeg &&
image->buffer->params.type == FZ_IMAGE_JPEG &&
image->colorspace == fz_device_cmyk(ctx) &&
image->buffer->params.u.jpeg.color_transform)
{
fz_invert_pixmap(ctx, tile);
}
break;
}
/* Now we try to cache the pixmap. Any failure here will just result
* in us not caching. */
fz_var(keyp);
fz_try(ctx)
{
fz_pixmap *existing_tile;
keyp = fz_malloc_struct(ctx, fz_image_key);
keyp->refs = 1;
keyp->image = fz_keep_image(ctx, image);
keyp->l2factor = l2factor;
existing_tile = fz_store_item(ctx, keyp, tile, fz_pixmap_size(ctx, tile), &fz_image_store_type);
if (existing_tile)
{
/* We already have a tile. This must have been produced by a
* racing thread. We'll throw away ours and use that one. */
fz_drop_pixmap(ctx, tile);
tile = existing_tile;
}
}
fz_always(ctx)
{
fz_drop_image_key(ctx, keyp);
}
fz_catch(ctx)
{
/* Do nothing */
}
return tile;
}
fz_image *
fz_new_image_from_pixmap(fz_context *ctx, fz_pixmap *pixmap, fz_image *mask)
{
fz_image *image;
assert(mask == NULL || mask->mask == NULL);
fz_try(ctx)
{
image = fz_malloc_struct(ctx, fz_image);
FZ_INIT_STORABLE(image, 1, fz_free_image);
image->w = pixmap->w;
image->h = pixmap->h;
image->n = pixmap->n;
image->colorspace = pixmap->colorspace;
image->bpc = 8;
image->buffer = NULL;
image->get_pixmap = fz_image_get_pixmap;
image->xres = pixmap->xres;
image->yres = pixmap->yres;
image->tile = pixmap;
image->mask = mask;
}
fz_catch(ctx)
{
fz_drop_image(ctx, mask);
fz_rethrow(ctx);
}
return image;
}
fz_image *
fz_new_image(fz_context *ctx, int w, int h, int bpc, fz_colorspace *colorspace,
int xres, int yres, int interpolate, int imagemask, float *decode,
int *colorkey, fz_compressed_buffer *buffer, fz_image *mask)
{
fz_image *image;
assert(mask == NULL || mask->mask == NULL);
fz_try(ctx)
{
image = fz_malloc_struct(ctx, fz_image);
FZ_INIT_STORABLE(image, 1, fz_free_image);
image->get_pixmap = fz_image_get_pixmap;
image->w = w;
image->h = h;
image->xres = xres;
image->yres = yres;
image->bpc = bpc;
image->n = (colorspace ? colorspace->n : 1);
image->colorspace = colorspace;
image->interpolate = interpolate;
image->imagemask = imagemask;
image->usecolorkey = (colorkey != NULL);
if (colorkey)
memcpy(image->colorkey, colorkey, sizeof(int)*image->n*2);
if (decode)
memcpy(image->decode, decode, sizeof(float)*image->n*2);
else
{
float maxval = fz_colorspace_is_indexed(colorspace) ? (1 << bpc) - 1 : 1;
int i;
for (i = 0; i < image->n; i++)
{
image->decode[2*i] = 0;
image->decode[2*i+1] = maxval;
}
}
image->mask = mask;
image->buffer = buffer;
}
fz_catch(ctx)
{
fz_free_compressed_buffer(ctx, buffer);
fz_rethrow(ctx);
}
return image;
}
fz_image *
fz_new_image_from_data(fz_context *ctx, unsigned char *data, int len)
{
fz_buffer *buffer = NULL;
fz_image *image;
fz_var(buffer);
fz_var(data);
fz_try(ctx)
{
buffer = fz_new_buffer_from_data(ctx, data, len);
data = NULL;
image = fz_new_image_from_buffer(ctx, buffer);
}
fz_always(ctx)
{
fz_drop_buffer(ctx, buffer);
}
fz_catch(ctx)
{
fz_free(ctx, data);
fz_rethrow(ctx);
}
return image;
}
fz_image *
fz_new_image_from_buffer(fz_context *ctx, fz_buffer *buffer)
{
fz_compressed_buffer *bc = NULL;
int w, h, xres, yres;
fz_colorspace *cspace;
int len = buffer->len;
unsigned char *buf = buffer->data;
fz_var(bc);
fz_try(ctx)
{
if (len < 8)
fz_throw(ctx, FZ_ERROR_GENERIC, "unknown image file format");
bc = fz_malloc_struct(ctx, fz_compressed_buffer);
bc->buffer = fz_keep_buffer(ctx, buffer);
if (buf[0] == 0xff && buf[1] == 0xd8)
{
bc->params.type = FZ_IMAGE_JPEG;
bc->params.u.jpeg.color_transform = -1;
fz_load_jpeg_info(ctx, buf, len, &w, &h, &xres, &yres, &cspace);
}
else if (memcmp(buf, "\211PNG\r\n\032\n", 8) == 0)
{
bc->params.type = FZ_IMAGE_PNG;
fz_load_png_info(ctx, buf, len, &w, &h, &xres, &yres, &cspace);
}
else if (memcmp(buf, "II", 2) == 0 && buf[2] == 0xBC)
{
bc->params.type = FZ_IMAGE_JXR;
fz_throw(ctx, FZ_ERROR_GENERIC, "JPEG-XR codec is not available");
}
else if (memcmp(buf, "MM", 2) == 0 || memcmp(buf, "II", 2) == 0)
{
bc->params.type = FZ_IMAGE_TIFF;
fz_load_tiff_info(ctx, buf, len, &w, &h, &xres, &yres, &cspace);
}
else
fz_throw(ctx, FZ_ERROR_GENERIC, "unknown image file format");
}
fz_catch(ctx)
{
fz_free_compressed_buffer(ctx, bc);
fz_rethrow(ctx);
}
return fz_new_image(ctx, w, h, 8, cspace, xres, yres, 0, 0, NULL, NULL, bc, NULL);
}
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