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plug-ins: Correct Legacy PSD layer style loading format

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Per Wormnest, the 4 bytes allocated to
PSD Legacy Dropshadow properties are
meant to be used for fixed floating point
values rather than integers. This patch
corrects the PSD layer resource struct and
how the data is loaded, based on prior
work by Wormnest.
This commit is contained in:
Alx Sa 2025-06-17 00:09:33 +00:00
parent 879aa8e89f
commit c6655c2eac
2 changed files with 53 additions and 48 deletions
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45
plug-ins/file-psd/psd-layer-res-load.c
View file

@ -734,6 +734,10 @@ load_resource_lsct (const PSDlayerres *res_a,
return 0;
}
/* Adobe uses fixed point ints which consist of four bytes: a 16-bit number and
* 16-bit fraction */
#define FIXED_TO_FLOAT(num,fract) (gfloat) num + fract / 65535.0f
static gint
load_resource_lrfx (const PSDlayerres *res_a,
PSDlayer *lyr_a,
@ -789,15 +793,11 @@ load_resource_lrfx (const PSDlayerres *res_a,
else if (memcmp (effectname, "dsdw", 4) == 0)
{
gchar bim[4];
guint16 spacer16;
guint16 temp[8];
if (psd_read (input, &ls_a->dsdw.size, 4, error) < 4 ||
psd_read (input, &ls_a->dsdw.ver, 4, error) < 4 ||
psd_read (input, &ls_a->dsdw.blur, 2, error) < 2 ||
psd_read (input, &ls_a->dsdw.intensity, 4, error) < 4 ||
psd_read (input, &ls_a->dsdw.angle, 4, error) < 4 ||
psd_read (input, &ls_a->dsdw.distance, 4, error) < 4 ||
psd_read (input, &spacer16, 2, error) < 2 ||
psd_read (input, &temp, 16, error) < 2 ||
psd_read (input, &ls_a->dsdw.color[0], 2, error) < 2 ||
psd_read (input, &ls_a->dsdw.color[1], 2, error) < 2 ||
psd_read (input, &ls_a->dsdw.color[2], 2, error) < 2 ||
@ -814,10 +814,14 @@ load_resource_lrfx (const PSDlayerres *res_a,
}
ls_a->dsdw.size = GUINT32_TO_BE (ls_a->dsdw.size);
ls_a->dsdw.ver = GUINT32_TO_BE (ls_a->dsdw.ver);
ls_a->dsdw.blur = GUINT16_TO_BE (ls_a->dsdw.blur);
ls_a->dsdw.intensity = GUINT32_TO_BE (ls_a->dsdw.intensity);
ls_a->dsdw.angle = GINT32_TO_BE (ls_a->dsdw.angle);
ls_a->dsdw.distance = GUINT32_TO_BE (ls_a->dsdw.distance);
ls_a->dsdw.blur = FIXED_TO_FLOAT (GUINT16_TO_BE (temp[0]),
GUINT16_TO_BE (temp[1]));
ls_a->dsdw.intensity = FIXED_TO_FLOAT (GUINT16_TO_BE (temp[2]),
GUINT16_TO_BE (temp[3]));
ls_a->dsdw.angle = FIXED_TO_FLOAT (GUINT16_TO_BE (temp[4]),
GUINT16_TO_BE (temp[5]));
ls_a->dsdw.distance = FIXED_TO_FLOAT (GUINT16_TO_BE (temp[6]),
GUINT16_TO_BE (temp[7]));
if (ls_a->dsdw.ver == 2)
{
@ -835,15 +839,11 @@ load_resource_lrfx (const PSDlayerres *res_a,
else if (memcmp (effectname, "isdw", 4) == 0)
{
gchar bim[4];
guint16 spacer16;
guint16 temp[8];
if (psd_read (input, &ls_a->isdw.size, 4, error) < 4 ||
psd_read (input, &ls_a->isdw.ver, 4, error) < 4 ||
psd_read (input, &ls_a->isdw.blur, 2, error) < 2 ||
psd_read (input, &ls_a->isdw.intensity, 4, error) < 4 ||
psd_read (input, &ls_a->isdw.angle, 4, error) < 4 ||
psd_read (input, &ls_a->isdw.distance, 4, error) < 4 ||
psd_read (input, &spacer16, 2, error) < 2 ||
psd_read (input, &temp, 16, error) < 2 ||
psd_read (input, &ls_a->isdw.color[0], 2, error) < 2 ||
psd_read (input, &ls_a->isdw.color[1], 2, error) < 2 ||
psd_read (input, &ls_a->isdw.color[2], 2, error) < 2 ||
@ -860,10 +860,14 @@ load_resource_lrfx (const PSDlayerres *res_a,
}
ls_a->isdw.size = GUINT32_TO_BE (ls_a->isdw.size);
ls_a->isdw.ver = GUINT32_TO_BE (ls_a->isdw.ver);
ls_a->isdw.blur = GUINT16_TO_BE (ls_a->isdw.blur);
ls_a->isdw.intensity = GUINT32_TO_BE (ls_a->isdw.intensity);
ls_a->isdw.angle = GINT32_TO_BE (ls_a->isdw.angle);
ls_a->isdw.distance = GUINT32_TO_BE (ls_a->isdw.distance);
ls_a->isdw.blur = FIXED_TO_FLOAT (GUINT16_TO_BE (temp[0]),
GUINT16_TO_BE (temp[1]));
ls_a->isdw.intensity = FIXED_TO_FLOAT (GUINT16_TO_BE (temp[2]),
GUINT16_TO_BE (temp[3]));
ls_a->isdw.angle = FIXED_TO_FLOAT (GUINT16_TO_BE (temp[4]),
GUINT16_TO_BE (temp[5]));
ls_a->isdw.distance = FIXED_TO_FLOAT (GUINT16_TO_BE (temp[6]),
GUINT16_TO_BE (temp[7]));
if (ls_a->isdw.ver == 2)
{
@ -1035,6 +1039,7 @@ load_resource_lrfx (const PSDlayerres *res_a,
return 0;
}
#undef FIXED_TO_FLOAT
static gint
load_resource_lyvr (const PSDlayerres *res_a,

8
plug-ins/file-psd/psd.h
View file

@ -593,10 +593,10 @@ typedef struct
{
guint32 size;
guint32 ver;
guint16 blur;
guint32 intensity;
gint32 angle;
guint32 distance;
gfloat blur;
gfloat intensity;
gfloat angle;
gfloat distance;
guint16 color[5];
gchar blendsig[4];
guchar effecton;