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Support Lab color gradients

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This commit is contained in:
Cristy
2020-02-22 09:50:37 -05:00
parent 784b348dbd
commit c003201ebe
1 changed files with 28 additions and 34 deletions
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coders/gradient.c
+28 -34
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@@ -167,7 +167,8 @@ static Image *ReadGRADIENTImage(const ImageInfo *image_info,
ExceptionInfo *exception)
{
char
colorname[MagickPathExtent+4];
start_color[MagickPathExtent],
stop_color[MagickPathExtent];
Image
*image;
@@ -176,14 +177,16 @@ static Image *ReadGRADIENTImage(const ImageInfo *image_info,
*read_info;
MagickBooleanType
icc_color,
status;
register char
*p;
StopInfo
*stops;
/*
Initialize Image structure.
Identify start and stop gradient colors.
*/
assert(image_info != (const ImageInfo *) NULL);
assert(image_info->signature == MagickCoreSignature);
@@ -192,57 +195,48 @@ static Image *ReadGRADIENTImage(const ImageInfo *image_info,
image_info->filename);
assert(exception != (ExceptionInfo *) NULL);
assert(exception->signature == MagickCoreSignature);
(void) CopyMagickString(start_color,image_info->filename,MagickPathExtent);
(void) CopyMagickString(stop_color,image_info->filename,MagickPathExtent);
for (p=start_color; (*p != '-') && (*p != '\0'); p++)
if (*p == '(')
for (p++; (*p != ')') && (*p != '\0'); p++);
if (*p == '-')
(void) CopyMagickString(stop_color,p+1,MagickPathExtent);
*p='\0';
/*
Create base gradient image from start color.
*/
read_info=CloneImageInfo(image_info);
SetImageInfoBlob(read_info,(void *) NULL,0);
(void) CopyMagickString(colorname,image_info->filename,MagickPathExtent);
(void) sscanf(image_info->filename,"%[^-]",colorname);
(void) CopyMagickString(read_info->filename,colorname,MagickPathExtent);
(void) CopyMagickString(read_info->filename,start_color,MagickPathExtent);
image=ReadXCImage(read_info,exception);
read_info=DestroyImageInfo(read_info);
if (image == (Image *) NULL)
return((Image *) NULL);
(void) SetImageAlpha(image,(Quantum) TransparentAlpha,exception);
(void) CopyMagickString(image->filename,image_info->filename,
MagickPathExtent);
icc_color=MagickFalse;
if (LocaleCompare(colorname,"icc") == 0)
{
(void) ConcatenateMagickString(colorname,"-",MagickPathExtent);
(void) sscanf(image_info->filename,"%*[^-]-%[^-]",colorname+4);
icc_color=MagickTrue;
}
/*
Create gradient stops.
*/
stops=(StopInfo *) AcquireQuantumMemory(2,sizeof(*stops));
if (stops == (StopInfo *) NULL)
ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
stops[0].offset=0.0;
stops[1].offset=1.0;
status=QueryColorCompliance(colorname,AllCompliance,&stops[0].color,
status=QueryColorCompliance(start_color,AllCompliance,&stops[0].color,
exception);
if (status != MagickFalse)
status=QueryColorCompliance(stop_color,AllCompliance,&stops[1].color,
exception);
if (status == MagickFalse)
{
stops=(StopInfo *) RelinquishMagickMemory(stops);
image=DestroyImage(image);
return((Image *) NULL);
}
(void) SetImageColorspace(image,stops[0].color.colorspace,exception);
(void) CopyMagickString(colorname,"white",MagickPathExtent);
if (GetPixelInfoIntensity(image,&stops[0].color) > (QuantumRange/2.0))
(void) CopyMagickString(colorname,"black",MagickPathExtent);
if (icc_color == MagickFalse)
(void) sscanf(image_info->filename,"%*[^-]-%[^-]",colorname);
else
(void) sscanf(image_info->filename,"%*[^-]-%*[^-]-%[^-]",colorname);
status=QueryColorCompliance(colorname,AllCompliance,&stops[1].color,
exception);
if (status == MagickFalse)
{
stops=(StopInfo *) RelinquishMagickMemory(stops);
image=DestroyImage(image);
return((Image *) NULL);
}
image->alpha_trait=stops[0].color.alpha_trait;
if (stops[1].color.alpha_trait != UndefinedPixelTrait)
image->alpha_trait=stops[1].color.alpha_trait;
/*
Paint gradient.
*/
status=GradientImage(image,LocaleCompare(image_info->magick,"GRADIENT") == 0 ?
LinearGradient : RadialGradient,PadSpread,stops,2,exception);
stops=(StopInfo *) RelinquishMagickMemory(stops);