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PIKApp/plug-ins/file-psd/psd-util.c

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/* PIKA - Photo and Image Kooker Application
* a rebranding of The GNU Image Manipulation Program (created with heckimp)
* A derived work which may be trivial. However, any changes may be (C)2023 by Aldercone Studio
*
* Original copyright, applying to most contents (license remains unchanged):
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* PIKA PSD Plug-in
* Copyright 2007 by John Marshall
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <string.h>
#include <errno.h>
#include <glib/gstdio.h>
#include <libpika/pika.h>
#include "psd.h"
#include "psd-util.h"
#include "libpika/stdplugins-intl.h"
/* Local constants */
#define MIN_RUN 3
/* Local types */
typedef struct
{
const gchar *name;
const gchar *psd_mode;
PikaLayerMode pika_mode;
gboolean exact; /* does the modes behave (more-or-less) the same in
* Photoshop and in PIKA?
*/
} LayerModeMapping;
/* Local function prototypes */
static const gchar * get_enum_value_nick (GType type,
gint value);
/* Local variables */
/* mapping table between Photoshop and PIKA modes. in case a mode matches more
* than one entry (in either direction), the first entry wins.
*/
static const LayerModeMapping layer_mode_map[] =
{
/* Name PSD PIKA Exact? */
/* Normal (ps3) */
{ "Normal", "norm", PIKA_LAYER_MODE_NORMAL, TRUE },
{ "Normal", "norm", PIKA_LAYER_MODE_NORMAL_LEGACY, TRUE },
/* Dissolve (ps3) */
{ "Dissolve", "diss", PIKA_LAYER_MODE_DISSOLVE, TRUE },
/* Multiply (ps3) */
{ "Multiply", "mul ", PIKA_LAYER_MODE_MULTIPLY, TRUE },
{ "Multiply", "mul ", PIKA_LAYER_MODE_MULTIPLY_LEGACY, TRUE },
/* Screen (ps3) */
{ "Screen", "scrn", PIKA_LAYER_MODE_SCREEN, TRUE },
{ "Screen", "scrn", PIKA_LAYER_MODE_SCREEN_LEGACY, TRUE },
/* Overlay (ps3) */
{ "Overlay", "over", PIKA_LAYER_MODE_OVERLAY, TRUE },
/* Difference (ps3) */
{ "Difference", "diff", PIKA_LAYER_MODE_DIFFERENCE, TRUE },
{ "Difference", "diff", PIKA_LAYER_MODE_DIFFERENCE_LEGACY, TRUE },
/* Linear Dodge (cs2) */
{ "Linear Dodge", "lddg", PIKA_LAYER_MODE_ADDITION, TRUE },
{ "Linear Dodge", "lddg", PIKA_LAYER_MODE_ADDITION_LEGACY, TRUE },
/* Subtract (??) */
{ "Subtract", "fsub", PIKA_LAYER_MODE_SUBTRACT, TRUE },
{ "Subtract", "fsub", PIKA_LAYER_MODE_SUBTRACT_LEGACY, TRUE },
/* Darken (ps3) */
{ "Darken", "dark", PIKA_LAYER_MODE_DARKEN_ONLY, TRUE },
{ "Darken", "dark", PIKA_LAYER_MODE_DARKEN_ONLY_LEGACY, TRUE },
/* Lighten (ps3) */
{ "Ligten", "lite", PIKA_LAYER_MODE_LIGHTEN_ONLY, TRUE },
{ "Ligten", "lite", PIKA_LAYER_MODE_LIGHTEN_ONLY_LEGACY, TRUE },
/* Hue (ps3) */
{ "Hue", "hue ", PIKA_LAYER_MODE_LCH_HUE, FALSE },
{ "Hue", "hue ", PIKA_LAYER_MODE_HSV_HUE, FALSE },
{ "Hue", "hue ", PIKA_LAYER_MODE_HSV_HUE_LEGACY, FALSE },
/* Saturation (ps3) */
{ "Saturation", "sat ", PIKA_LAYER_MODE_LCH_CHROMA, FALSE },
{ "Saturation", "sat ", PIKA_LAYER_MODE_HSV_SATURATION, FALSE },
{ "Saturation", "sat ", PIKA_LAYER_MODE_HSV_SATURATION_LEGACY, FALSE },
/* Color (ps3) */
{ "Color", "colr", PIKA_LAYER_MODE_LCH_COLOR, FALSE },
{ "Color", "colr", PIKA_LAYER_MODE_HSL_COLOR, FALSE },
{ "Color", "colr", PIKA_LAYER_MODE_HSL_COLOR_LEGACY, FALSE },
/* Luminosity (ps3) */
{ "Luminosity", "lum ", PIKA_LAYER_MODE_LCH_LIGHTNESS, FALSE },
{ "Luminosity", "lum ", PIKA_LAYER_MODE_HSV_VALUE, FALSE },
{ "Luminosity", "lum ", PIKA_LAYER_MODE_HSV_VALUE_LEGACY, FALSE },
{ "Luminosity", "lum ", PIKA_LAYER_MODE_LUMINANCE, FALSE },
/* Divide (??) */
{ "Divide", "fdiv", PIKA_LAYER_MODE_DIVIDE, TRUE },
{ "Divide", "fdiv", PIKA_LAYER_MODE_DIVIDE_LEGACY, TRUE },
/* Color Dodge (ps6) */
{ "Color Dodge", "div ", PIKA_LAYER_MODE_DODGE, TRUE },
{ "Color Dodge", "div ", PIKA_LAYER_MODE_DODGE_LEGACY, TRUE },
/* Color Burn (ps6) */
{ "Color Burn", "idiv", PIKA_LAYER_MODE_BURN, TRUE },
{ "Color Burn", "idiv", PIKA_LAYER_MODE_BURN_LEGACY, TRUE },
/* Hard Light (ps3) */
{ "Hard Light", "hLit", PIKA_LAYER_MODE_HARDLIGHT, TRUE },
{ "Hard Light", "hLit", PIKA_LAYER_MODE_HARDLIGHT_LEGACY, TRUE },
/* Soft Light (ps3) */
{ "Soft Light", "sLit", PIKA_LAYER_MODE_SOFTLIGHT, FALSE },
{ "Soft Light", "sLit", PIKA_LAYER_MODE_SOFTLIGHT_LEGACY, FALSE },
{ "Soft Light", "sLit", PIKA_LAYER_MODE_OVERLAY_LEGACY, FALSE },
/* Vivid Light (ps7)*/
{ "Vivid Light", "vLit", PIKA_LAYER_MODE_VIVID_LIGHT, TRUE },
/* Pin Light (ps7)*/
{ "Pin Light", "pLit", PIKA_LAYER_MODE_PIN_LIGHT, TRUE },
/* Linear Light (ps7)*/
{ "Linear Light", "lLit", PIKA_LAYER_MODE_LINEAR_LIGHT, TRUE },
/* Hard Mix (CS)*/
{ "Hard Mix", "hMix", PIKA_LAYER_MODE_HARD_MIX, TRUE },
/* Exclusion (ps6) */
{ "Exclusion", "smud", PIKA_LAYER_MODE_EXCLUSION, TRUE },
/* Linear Burn (ps7)*/
{ "Linear Burn", "lbrn", PIKA_LAYER_MODE_LINEAR_BURN, TRUE },
/* Darker Color (??)*/
{ "Darker Color", "dkCl", PIKA_LAYER_MODE_LUMA_DARKEN_ONLY, FALSE },
/* Lighter Color (??)*/
{ "Lighter Color", "lgCl", PIKA_LAYER_MODE_LUMA_LIGHTEN_ONLY, FALSE },
/* Pass Through (CS)*/
{ "Pass Through", "pass", PIKA_LAYER_MODE_PASS_THROUGH, TRUE },
};
/* Utility function */
void
psd_set_error (GError **error)
{
if (! error || ! *error)
g_set_error (error, G_FILE_ERROR, G_FILE_ERROR_FAILED,
_("Error reading data. Most likely unexpected end of file."));
return;
}
gint
psd_read (GInputStream *input,
gconstpointer data,
gint count,
GError **error)
{
gsize bytes_read = 0;
/* we allow for 'data == NULL && count == 0', which g_input_stream_read_all()
* rejects.
*/
if (count > 0)
{
/* We consider reading less bytes than we want an error. */
if (g_input_stream_read_all (input, (void *) data, count,
&bytes_read, NULL, error) &&
bytes_read < count)
g_set_error (error, G_FILE_ERROR, G_FILE_ERROR_FAILED,
_("Unexpected end of file"));
}
return bytes_read;
}
gboolean
psd_read_len (GInputStream *input,
gsize *data,
gint psd_version,
GError **error)
{
gint block_len_size = (psd_version == 1 ? 4 : 8);
if (psd_read (input, data, block_len_size, error) < block_len_size)
{
psd_set_error (error);
return FALSE;
}
if (psd_version == 1)
*data = GUINT32_FROM_BE (*data);
else
*data = GUINT64_FROM_BE (*data);
return TRUE;
}
gboolean
psd_seek (GInputStream *input,
goffset offset,
GSeekType type,
GError **error)
{
return g_seekable_seek (G_SEEKABLE (input),
offset, type,
NULL, error);
}
gchar *
fread_pascal_string (gint32 *bytes_read,
gint32 *bytes_written,
guint16 mod_len,
GInputStream *input,
GError **error)
{
/*
* Reads a pascal string from the file padded to a multiple of mod_len
* and returns a utf-8 string.
*/
gchar *str;
gchar *utf8_str;
guchar len = 0;
gint32 padded_len;
*bytes_read = 0;
*bytes_written = -1;
if (psd_read (input, &len, 1, error) < 1)
{
psd_set_error (error);
return NULL;
}
(*bytes_read)++;
IFDBG(3) g_debug ("Pascal string length %d", len);
if (len == 0)
{
if (! psd_seek (input, mod_len - 1, G_SEEK_CUR, error))
{
psd_set_error (error);
return NULL;
}
*bytes_read += (mod_len - 1);
*bytes_written = 0;
return NULL;
}
str = g_malloc (len);
if (psd_read (input, str, len, error) < len)
{
psd_set_error (error);
g_free (str);
return NULL;
}
*bytes_read += len;
if (mod_len > 0)
{
padded_len = len + 1;
while (padded_len % mod_len != 0)
{
if (! psd_seek (input, 1, G_SEEK_CUR, error))
{
psd_set_error (error);
g_free (str);
return NULL;
}
(*bytes_read)++;
padded_len++;
}
}
utf8_str = pika_any_to_utf8 (str, len, NULL);
*bytes_written = strlen (utf8_str);
g_free (str);
IFDBG(3) g_debug ("Pascal string: %s, bytes_read: %d, bytes_written: %d",
utf8_str, *bytes_read, *bytes_written);
return utf8_str;
}
gint32
fwrite_pascal_string (const gchar *src,
guint16 mod_len,
GOutputStream *output,
GError **error)
{
/*
* Converts utf-8 string to current locale and writes as pascal
* string with padding to a multiple of mod_len.
*/
gchar *str;
gchar *pascal_str;
const gchar null_str = 0x0;
guchar pascal_len;
gsize bytes_written = 0;
gsize len;
g_debug ("fwrite_pascal_string %s!", src);
if (src == NULL)
{
/* Write null string as two null bytes (0x0) */
if (! g_output_stream_write_all (output, &null_str, 1,
&bytes_written, NULL, error) ||
! g_output_stream_write_all (output, &null_str, 1,
&bytes_written, NULL, error))
{
psd_set_error (error);
return -1;
}
bytes_written += 2;
}
else
{
str = g_locale_from_utf8 (src, -1, NULL, &len, NULL);
if (len > 255)
pascal_len = 255;
else
pascal_len = len;
pascal_str = g_strndup (str, pascal_len);
g_free (str);
if (! g_output_stream_write_all (output, &pascal_len, 1,
&bytes_written, NULL, error) ||
! g_output_stream_write_all (output, pascal_str, pascal_len,
&bytes_written, NULL, error))
{
g_free (pascal_str);
return -1;
}
bytes_written++;
bytes_written += pascal_len;
IFDBG(2) g_debug ("Pascal string: %s, bytes_written: %" G_GSIZE_FORMAT,
pascal_str, bytes_written);
g_free (pascal_str);
}
/* Pad with nulls */
if (mod_len > 0)
{
while (bytes_written % mod_len != 0)
{
if (! g_output_stream_write_all (output, &null_str, 1,
&bytes_written, NULL, error))
{
return -1;
}
bytes_written++;
}
}
return bytes_written;
}
gchar *
fread_unicode_string (gint32 *bytes_read,
gint32 *bytes_written,
guint16 mod_len,
gboolean ibm_pc_format,
GInputStream *input,
GError **error)
{
/*
* Reads a utf-16 string from the file padded to a multiple of mod_len
* and returns a utf-8 string.
*/
gchar *utf8_str;
gunichar2 *utf16_str;
gint32 len = 0;
gint32 i;
gint32 padded_len;
glong utf8_str_len;
*bytes_read = 0;
*bytes_written = -1;
if (psd_read (input, &len, 4, error) < 4)
{
psd_set_error (error);
return NULL;
}
*bytes_read += 4;
if (! ibm_pc_format)
len = GINT32_FROM_BE (len);
else
len = GINT32_FROM_LE (len);
IFDBG(3) g_debug ("Unicode string length %d", len);
if (len == 0)
{
if (! psd_seek (input, mod_len - 1, G_SEEK_CUR, error))
{
psd_set_error (error);
return NULL;
}
*bytes_read += (mod_len - 1);
*bytes_written = 0;
return NULL;
}
utf16_str = g_malloc (len * 2);
for (i = 0; i < len; ++i)
{
if (psd_read (input, &utf16_str[i], 2, error) < 2)
{
psd_set_error (error);
g_free (utf16_str);
return NULL;
}
*bytes_read += 2;
if (! ibm_pc_format)
utf16_str[i] = GINT16_FROM_BE (utf16_str[i]);
else
utf16_str[i] = GINT16_FROM_LE (utf16_str[i]);
}
if (mod_len > 0)
{
padded_len = *bytes_read;
while (padded_len % mod_len != 0)
{
if (! psd_seek (input, 1, G_SEEK_CUR, error))
{
psd_set_error (error);
g_free (utf16_str);
return NULL;
}
(*bytes_read)++;
padded_len++;
}
}
utf8_str = g_utf16_to_utf8 (utf16_str, len, NULL, &utf8_str_len, NULL);
*bytes_written = utf8_str_len;
g_free (utf16_str);
IFDBG(3) g_debug ("Unicode string: %s, bytes_read: %d, bytes_written: %d",
utf8_str, *bytes_read, *bytes_written);
return utf8_str;
}
gint32
fwrite_unicode_string (const gchar *src,
guint16 mod_len,
GOutputStream *output,
GError **error)
{
/*
* Converts utf-8 string to utf-16 and writes 4 byte length
* then string padding to multiple of mod_len.
*/
gunichar2 *utf16_str;
gchar null_str = 0x0;
gint32 utf16_len = 0;
gsize bytes_written = 0;
gint i;
glong len;
if (src == NULL)
{
/* Write null string as four byte 0 int32 */
if (! g_output_stream_write_all (output, &utf16_len, 4,
&bytes_written, NULL, error))
{
return -1;
}
bytes_written += 4;
}
else
{
utf16_str = g_utf8_to_utf16 (src, -1, NULL, &len, NULL);
/* Byte swap as required */
utf16_len = len;
for (i = 0; i < utf16_len; ++i)
utf16_str[i] = GINT16_TO_BE (utf16_str[i]);
utf16_len = GINT32_TO_BE (utf16_len);
if (! g_output_stream_write_all (output, &utf16_len, 4,
&bytes_written, NULL, error) ||
! g_output_stream_write_all (output, &utf16_str, 2 * (utf16_len + 1),
&bytes_written, NULL, error))
{
return -1;
}
bytes_written += (4 + 2 * utf16_len + 2);
IFDBG(2) g_debug ("Unicode string: %s, bytes_written: %" G_GSIZE_FORMAT,
src, bytes_written);
}
/* Pad with nulls */
if (mod_len > 0)
{
while (bytes_written % mod_len != 0)
{
if (! g_output_stream_write_all (output, &null_str, 1,
&bytes_written, NULL, error))
{
return -1;
}
bytes_written++;
}
}
return bytes_written;
}
gint
decode_packbits (const gchar *src,
gchar *dst,
guint16 packed_len,
guint32 unpacked_len)
{
/*
* Decode a PackBits chunk.
*/
gint n;
gint32 unpack_left = unpacked_len;
gint32 pack_left = packed_len;
gint32 error_code = 0;
gint32 return_val = 0;
while (unpack_left > 0 && pack_left > 0)
{
n = *(const guchar *) src;
src++;
pack_left--;
if (n == 128) /* nop */
continue;
else if (n > 128)
n -= 256;
if (n < 0) /* replicate next gchar |n|+ 1 times */
{
n = 1 - n;
if (pack_left < 1)
{
IFDBG(2) g_debug ("Input buffer exhausted in replicate");
error_code = 1;
break;
}
if (unpack_left < n)
{
IFDBG(2) g_debug ("Overrun in packbits replicate of %d chars", n - unpack_left);
error_code = 2;
break;
}
memset (dst, *src, n);
src++;
pack_left--;
dst += n;
unpack_left -= n;
}
else /* copy next n+1 gchars literally */
{
n++;
if (pack_left < n)
{
IFDBG(2) g_debug ("Input buffer exhausted in copy");
error_code = 3;
break;
}
if (unpack_left < n)
{
IFDBG(2) g_debug ("Output buffer exhausted in copy");
error_code = 4;
break;
}
memcpy (dst, src, n);
src += n;
pack_left -= n;
dst += n;
unpack_left -= n;
}
}
if (unpack_left > 0)
{
/* Pad with zeros to end of output buffer */
memset (dst, 0, unpack_left);
}
if (unpack_left)
{
IFDBG(2) g_debug ("Packbits decode - unpack left %d", unpack_left);
return_val -= unpack_left;
}
if (pack_left)
{
/* Some images seem to have a pad byte at the end of the packed data */
if (error_code || pack_left != 1)
{
IFDBG(2) g_debug ("Packbits decode - pack left %d", pack_left);
return_val = pack_left;
}
}
IFDBG(2)
if (error_code)
g_debug ("Error code %d", error_code);
return return_val;
}
gchar *
encode_packbits (const gchar *src,
guint32 unpacked_len,
guint16 *packed_len)
{
/*
* Encode a PackBits chunk.
*/
GString *dst_str; /* destination string */
gint curr_char; /* current character */
gchar char_buff[128]; /* buffer of already read characters */
guchar run_len; /* number of characters in a run */
gint32 unpack_left = unpacked_len;
IFDBG(2) g_debug ("Encode packbits");
/* Initialise destination string */
dst_str = g_string_sized_new (unpacked_len);
/* prime the read loop */
curr_char = *src;
src++;
run_len = 0;
/* read input until there's nothing left */
while (unpack_left > 0)
{
char_buff[run_len] = (gchar) curr_char;
IFDBG(2) g_debug ("buff %x, run len %d, curr char %x",
char_buff[run_len], run_len, (gchar) curr_char);
run_len++;
if (run_len >= MIN_RUN)
{
gint i;
/* check for run */
for (i = 2; i <= MIN_RUN; ++i)
{
if (curr_char != char_buff[run_len - i])
{
/* no run */
i = 0;
break;
}
}
if (i != 0)
{
/* we have a run write out buffer before run*/
gint next_char;
if (run_len > MIN_RUN)
{
/* block size - 1 followed by contents */
g_string_append_c (dst_str, (run_len - MIN_RUN - 1));
g_string_append_len (dst_str, char_buff, (run_len - MIN_RUN));
IFDBG(2) g_debug ("(1) Number of chars: %d, run length tag: %d",
run_len - MIN_RUN, run_len - MIN_RUN - 1);
}
/* determine run length (MIN_RUN so far) */
run_len = MIN_RUN;
/* get next character */
next_char = *src;
src++;
unpack_left--;
while (next_char == curr_char)
{
run_len++;
if (run_len == 128)
{
/* run is at max length */
break;
}
next_char = *src;
src++;
unpack_left--;
}
/* write out encoded run length and run symbol */
g_string_append_c (dst_str, (gchar)(1 - (gint)(run_len)));
g_string_append_c (dst_str, curr_char);
IFDBG(2) g_debug ("(2) Number of chars: %d, run length tag: %d",
run_len, (1 - (gint)(run_len)));
if (unpack_left > 0)
{
/* make run breaker start of next buffer */
char_buff[0] = next_char;
run_len = 1;
}
else
{
/* file ends in a run */
run_len = 0;
}
}
}
if (run_len == 128)
{
/* write out buffer */
g_string_append_c (dst_str, 127);
g_string_append_len (dst_str, char_buff, 128);
IFDBG(2) g_debug ("(3) Number of chars: 128, run length tag: 127");
/* start a new buffer */
run_len = 0;
}
curr_char = *src;
src++;
unpack_left--;
}
/* write out last buffer */
if (run_len != 0)
{
if (run_len <= 128)
{
/* write out entire copy buffer */
g_string_append_c (dst_str, run_len - 1);
g_string_append_len (dst_str, char_buff, run_len);
IFDBG(2) g_debug ("(4) Number of chars: %d, run length tag: %d",
run_len, run_len - 1);
}
else
{
IFDBG(2) g_debug ("(5) Very bad - should not be here");
}
}
*packed_len = dst_str->len;
IFDBG(2) g_debug ("Packed len %d, unpacked %d", *packed_len, unpacked_len);
return g_string_free (dst_str, FALSE);
}
void
psd_to_pika_blend_mode (PSDlayer *psd_layer,
LayerModeInfo *mode_info)
{
gint i;
mode_info->mode = PIKA_LAYER_MODE_NORMAL;
/* FIXME: use the image mode to select the correct color spaces. for now,
* we use rgb-perceptual blending/compositing unconditionally.
*/
mode_info->blend_space = PIKA_LAYER_COLOR_SPACE_RGB_PERCEPTUAL;
mode_info->composite_space = PIKA_LAYER_COLOR_SPACE_RGB_PERCEPTUAL;
if (psd_layer->clipping == 1)
mode_info->composite_mode = PIKA_LAYER_COMPOSITE_CLIP_TO_BACKDROP;
else
mode_info->composite_mode = PIKA_LAYER_COMPOSITE_UNION;
for (i = 0; i < G_N_ELEMENTS (layer_mode_map); i++)
{
if (g_ascii_strncasecmp (psd_layer->blend_mode, layer_mode_map[i].psd_mode, 4) == 0)
{
if (! layer_mode_map[i].exact && CONVERSION_WARNINGS)
{
g_message ("PIKA uses a different equation than Photoshop for "
"blend mode: %s. Results will differ.",
layer_mode_map[i].name);
}
mode_info->mode = layer_mode_map[i].pika_mode;
return;
}
}
if (CONVERSION_WARNINGS)
{
gchar *mode_name = g_strndup (psd_layer->blend_mode, 4);
g_message ("Unsupported blend mode: %s. Mode reverts to normal",
mode_name);
g_free (mode_name);
}
}
const gchar *
pika_to_psd_blend_mode (const LayerModeInfo *mode_info)
{
gint i;
/* FIXME: select the image mode based on the layer mode color spaces. for
* now, we assume rgb-perceptual blending/compositing unconditionally.
*/
if (mode_info->blend_space != PIKA_LAYER_COLOR_SPACE_AUTO &&
mode_info->blend_space != PIKA_LAYER_COLOR_SPACE_RGB_PERCEPTUAL)
{
if (CONVERSION_WARNINGS)
g_message ("Unsupported blend color space: %s. "
"Blend color space reverts to rgb-perceptual",
get_enum_value_nick (PIKA_TYPE_LAYER_COLOR_SPACE,
mode_info->blend_space));
}
if (mode_info->composite_space != PIKA_LAYER_COLOR_SPACE_AUTO &&
mode_info->composite_space != PIKA_LAYER_COLOR_SPACE_RGB_PERCEPTUAL)
{
if (CONVERSION_WARNINGS)
g_message ("Unsupported composite color space: %s. "
"Composite color space reverts to rgb-perceptual",
get_enum_value_nick (PIKA_TYPE_LAYER_COLOR_SPACE,
mode_info->composite_space));
}
if (mode_info->composite_mode != PIKA_LAYER_COMPOSITE_AUTO &&
mode_info->composite_mode != PIKA_LAYER_COMPOSITE_UNION &&
mode_info->composite_mode != PIKA_LAYER_COMPOSITE_CLIP_TO_BACKDROP)
{
if (CONVERSION_WARNINGS)
g_message ("Unsupported composite mode: %s. "
"Composite mode reverts to union",
get_enum_value_nick (PIKA_TYPE_LAYER_COMPOSITE_MODE,
mode_info->composite_mode));
}
for (i = 0; i < G_N_ELEMENTS (layer_mode_map); i++)
{
if (layer_mode_map[i].pika_mode == mode_info->mode)
{
if (! layer_mode_map[i].exact && CONVERSION_WARNINGS)
{
g_message ("PIKA uses a different equation than Photoshop for "
"blend mode: %s. Results may differ.",
get_enum_value_nick (PIKA_TYPE_LAYER_MODE,
mode_info->mode));
}
return layer_mode_map[i].psd_mode;
}
}
if (CONVERSION_WARNINGS)
g_message ("Unsupported blend mode: %s. Mode reverts to normal",
get_enum_value_nick (PIKA_TYPE_LAYER_MODE, mode_info->mode));
return "norm";
}
PikaColorTag
psd_to_pika_layer_color_tag (guint16 layer_color_tag)
{
PikaColorTag colorTag;
switch (layer_color_tag)
{
case 1:
colorTag = PIKA_COLOR_TAG_RED;
break;
case 2:
colorTag = PIKA_COLOR_TAG_ORANGE;
break;
case 3:
colorTag = PIKA_COLOR_TAG_YELLOW;
break;
case 4:
colorTag = PIKA_COLOR_TAG_GREEN;
break;
case 5:
colorTag = PIKA_COLOR_TAG_BLUE;
break;
case 6:
colorTag = PIKA_COLOR_TAG_VIOLET;
break;
case 7:
colorTag = PIKA_COLOR_TAG_GRAY;
break;
default:
if (CONVERSION_WARNINGS)
g_message ("Unsupported Photoshop layer color tag: %i. PIKA layer color tag set to none.",
layer_color_tag);
colorTag = PIKA_COLOR_TAG_NONE;
}
return colorTag;
}
guint16
pika_to_psd_layer_color_tag (PikaColorTag layer_color_tag)
{
guint16 color_tag;
switch (layer_color_tag)
{
case PIKA_COLOR_TAG_RED:
color_tag = 1;
break;
case PIKA_COLOR_TAG_ORANGE:
color_tag = 2;
break;
case PIKA_COLOR_TAG_YELLOW:
color_tag = 3;
break;
case PIKA_COLOR_TAG_GREEN:
color_tag = 4;
break;
case PIKA_COLOR_TAG_BLUE:
color_tag = 5;
break;
case PIKA_COLOR_TAG_VIOLET:
color_tag = 6;
break;
case PIKA_COLOR_TAG_GRAY:
color_tag = 7;
break;
default:
if (CONVERSION_WARNINGS)
g_message ("Photoshop doesn't support PIKA layer color tag: %i. Photoshop layer color tag set to none.",
layer_color_tag);
color_tag = 0;
}
return color_tag;
}
static const gchar *
get_enum_value_nick (GType type,
gint value)
{
const gchar *nick;
if (pika_enum_get_value (type, value, NULL, &nick, NULL, NULL))
{
return nick;
}
else
{
static gchar err_name[32];
snprintf (err_name, sizeof (err_name), "UNKNOWN (%d)", value);
return err_name;
}
}
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