Imaging
ImagingResample(Imaging imIn, int xsize, int ysize, int filter, float box[4])
{
struct filter *filterp;
ResampleFunction ResampleHorizontal;
ResampleFunction ResampleVertical;
if (strcmp(imIn->mode, "P") == 0 || strcmp(imIn->mode, "1") == 0)
return (Imaging) ImagingError_ModeError();
if (imIn->type == IMAGING_TYPE_SPECIAL) {
return (Imaging) ImagingError_ModeError();
} else if (imIn->image8) {
ResampleHorizontal = ImagingResampleHorizontal_8bpc;
ResampleVertical = ImagingResampleVertical_8bpc;
} else {
switch(imIn->type) {
case IMAGING_TYPE_UINT8:
ResampleHorizontal = ImagingResampleHorizontal_8bpc;
ResampleVertical = ImagingResampleVertical_8bpc;
break;
case IMAGING_TYPE_INT32:
case IMAGING_TYPE_FLOAT32:
ResampleHorizontal = ImagingResampleHorizontal_32bpc;
ResampleVertical = ImagingResampleVertical_32bpc;
break;
default:
return (Imaging) ImagingError_ModeError();
}
}
/* check filter */
switch (filter) {
case IMAGING_TRANSFORM_BOX:
filterp = &BOX;
break;
case IMAGING_TRANSFORM_BILINEAR:
filterp = &BILINEAR;
break;
case IMAGING_TRANSFORM_HAMMING:
filterp = &HAMMING;
break;
case IMAGING_TRANSFORM_BICUBIC:
filterp = &BICUBIC;
break;
case IMAGING_TRANSFORM_LANCZOS:
filterp = &LANCZOS;
break;
default:
return (Imaging) ImagingError_ValueError(
"unsupported resampling filter"
);
}
return ImagingResampleInner(imIn, xsize, ysize, filterp, box,
ResampleHorizontal, ResampleVertical);
}
Imaging
ImagingRankFilter(Imaging im, int size, int rank)
{
Imaging imOut = NULL;
int x, y;
int i, margin, size2;
if (!im || im->bands != 1 || im->type == IMAGING_TYPE_SPECIAL)
return (Imaging) ImagingError_ModeError();
if (!(size & 1))
return (Imaging) ImagingError_ValueError("bad filter size");
size2 = size * size;
margin = (size-1) / 2;
if (rank < 0 || rank >= size2)
return (Imaging) ImagingError_ValueError("bad rank value");
imOut = ImagingNew(im->mode, im->xsize - 2*margin, im->ysize - 2*margin);
if (!imOut)
return NULL;
#define RANK_BODY(type) do {\
type* buf = malloc(size2 * sizeof(type));\
if (!buf)\
goto nomemory;\
for (y = 0; y < imOut->ysize; y++)\
for (x = 0; x < imOut->xsize; x++) {\
for (i = 0; i < size; i++)\
memcpy(buf + i*size, &IMAGING_PIXEL_##type(im, x, y+i),\
size * sizeof(type));\
IMAGING_PIXEL_##type(imOut, x, y) = Rank##type(buf, size2, rank);\
}\
} while (0)
if (im->image8)
RANK_BODY(UINT8);
else if (im->type == IMAGING_TYPE_INT32)
RANK_BODY(INT32);
else if (im->type == IMAGING_TYPE_FLOAT32)
RANK_BODY(FLOAT32);
else {
/* safety net (we shouldn't end up here) */
ImagingDelete(imOut);
return (Imaging) ImagingError_ModeError();
}
ImagingCopyInfo(imOut, im);
return imOut;
nomemory:
ImagingDelete(imOut);
return (Imaging) ImagingError_MemoryError();
}
Imaging
ImagingConvertMatrix(Imaging im, const char *mode, float m[])
{
Imaging imOut;
int x, y;
/* Assume there's enough data in the buffer */
if (!im)
return (Imaging) ImagingError_ModeError();
if (strcmp(mode, "L") == 0 && im->bands == 3) {
imOut = ImagingNew("L", im->xsize, im->ysize);
if (!imOut)
return NULL;
for (y = 0; y < im->ysize; y++) {
UINT8* in = (UINT8*) im->image[y];
UINT8* out = (UINT8*) imOut->image[y];
for (x = 0; x < im->xsize; x++) {
float v = m[0]*in[0] + m[1]*in[1] + m[2]*in[2] + m[3] + 0.5;
out[x] = CLIPF(v);
in += 4;
}
}
} else if (strlen(mode) == 3 && im->bands == 3) {
imOut = ImagingNew(mode, im->xsize, im->ysize);
if (!imOut)
return NULL;
for (y = 0; y < im->ysize; y++) {
UINT8* in = (UINT8*) im->image[y];
UINT8* out = (UINT8*) imOut->image[y];
for (x = 0; x < im->xsize; x++) {
float v0 = m[0]*in[0] + m[1]*in[1] + m[2]*in[2] + m[3] + 0.5;
float v1 = m[4]*in[0] + m[5]*in[1] + m[6]*in[2] + m[7] + 0.5;
float v2 = m[8]*in[0] + m[9]*in[1] + m[10]*in[2] + m[11] + 0.5;
out[0] = CLIPF(v0);
out[1] = CLIPF(v1);
out[2] = CLIPF(v2);
in += 4;
out += 4;
}
}
} else
return (Imaging) ImagingError_ModeError();
return imOut;
}
Imaging
ImagingFilter(Imaging im, int xsize, int ysize, const FLOAT32* kernel,
FLOAT32 offset)
{
Imaging imOut;
ImagingSectionCookie cookie;
if ( ! im || im->type != IMAGING_TYPE_UINT8)
return (Imaging) ImagingError_ModeError();
if (im->xsize < xsize || im->ysize < ysize)
return ImagingCopy(im);
if ((xsize != 3 && xsize != 5) || xsize != ysize)
return (Imaging) ImagingError_ValueError("bad kernel size");
imOut = ImagingNewDirty(im->mode, im->xsize, im->ysize);
if (!imOut)
return NULL;
ImagingSectionEnter(&cookie);
if (xsize == 3) {
/* 3x3 kernel. */
ImagingFilter3x3(imOut, im, kernel, offset);
} else {
/* 5x5 kernel. */
ImagingFilter5x5(imOut, im, kernel, offset);
}
ImagingSectionLeave(&cookie);
return imOut;
}
Imaging
ImagingFillRadialGradient(const char *mode)
{
Imaging im;
int x, y;
int d;
if (strlen(mode) != 1)
return (Imaging) ImagingError_ModeError();
im = ImagingNew(mode, 256, 256);
if (!im)
return NULL;
for (y = 0; y < 256; y++)
for (x = 0; x < 256; x++) {
d = (int) sqrt((double) ((x-128)*(x-128) + (y-128)*(y-128)) * 2.0);
if (d >= 255)
im->image8[y][x] = 255;
else
im->image8[y][x] = d;
}
return im;
}
Imaging
ImagingFillBand(Imaging imOut, int band, int color)
{
int x, y;
/* Check arguments */
if (!imOut || imOut->type != IMAGING_TYPE_UINT8)
return (Imaging) ImagingError_ModeError();
if (band < 0 || band >= imOut->bands)
return (Imaging) ImagingError_ValueError("band index out of range");
/* Special case for LXXA etc */
if (imOut->bands == 2 && band == 1)
band = 3;
color = CLIP(color);
/* Insert color into image */
for (y = 0; y < imOut->ysize; y++) {
UINT8* out = (UINT8*) imOut->image[y] + band;
for (x = 0; x < imOut->xsize; x++) {
*out = (UINT8) color;
out += 4;
}
}
return imOut;
}
ImagingPalette
ImagingPaletteNew(const char* mode)
{
/* Create a palette object */
int i;
ImagingPalette palette;
if (strcmp(mode, "RGB") && strcmp(mode, "RGBA"))
return (ImagingPalette) ImagingError_ModeError();
palette = calloc(1, sizeof(struct ImagingPaletteInstance));
if (!palette)
return (ImagingPalette) ImagingError_MemoryError();
strncpy(palette->mode, mode, IMAGING_MODE_LENGTH);
/* Initialize to ramp */
for (i = 0; i < 256; i++) {
palette->palette[i*4+0] =
palette->palette[i*4+1] =
palette->palette[i*4+2] = (UINT8) i;
palette->palette[i*4+3] = 255; /* opaque */
}
return palette;
}
Imaging ImagingGaussianBlur(Imaging im, Imaging imOut, float radius)
{
int channels = 0;
int padding = 0;
if (strcmp(im->mode, "RGB") == 0) {
channels = 3;
padding = 1;
} else if (strcmp(im->mode, "RGBA") == 0) {
channels = 3;
padding = 1;
} else if (strcmp(im->mode, "RGBX") == 0) {
channels = 3;
padding = 1;
} else if (strcmp(im->mode, "CMYK") == 0) {
channels = 4;
padding = 0;
} else if (strcmp(im->mode, "L") == 0) {
channels = 1;
padding = 0;
} else
return ImagingError_ModeError();
return gblur(im, imOut, radius, channels, padding);
}
Imaging
ImagingBlend(Imaging imIn1, Imaging imIn2, float alpha)
{
Imaging imOut;
int x, y;
/* Check arguments */
if (!imIn1 || !imIn2 || imIn1->type != IMAGING_TYPE_UINT8)
return ImagingError_ModeError();
if (imIn1->type != imIn2->type ||
imIn1->bands != imIn2->bands ||
imIn1->xsize != imIn2->xsize ||
imIn1->ysize != imIn2->ysize)
return ImagingError_Mismatch();
/* Shortcuts */
if (alpha == 0.0)
return ImagingCopy(imIn1);
else if (alpha == 1.0)
return ImagingCopy(imIn2);
imOut = ImagingNew(imIn1->mode, imIn1->xsize, imIn1->ysize);
if (!imOut)
return NULL;
ImagingCopyInfo(imOut, imIn1);
if (alpha >= 0 && alpha <= 1.0) {
/* Interpolate between bands */
for (y = 0; y < imIn1->ysize; y++) {
UINT8* in1 = (UINT8*) imIn1->image[y];
UINT8* in2 = (UINT8*) imIn2->image[y];
UINT8* out = (UINT8*) imOut->image[y];
for (x = 0; x < imIn1->linesize; x++)
out[x] = (UINT8)
((int) in1[x] + alpha * ((int) in2[x] - (int) in1[x]));
}
} else {
/* Extrapolation; must make sure to clip resulting values */
for (y = 0; y < imIn1->ysize; y++) {
UINT8* in1 = (UINT8*) imIn1->image[y];
UINT8* in2 = (UINT8*) imIn2->image[y];
UINT8* out = (UINT8*) imOut->image[y];
for (x = 0; x < imIn1->linesize; x++) {
float temp =
((int) in1[x] + alpha * ((int) in2[x] - (int) in1[x]));
if (temp <= 0.0)
out[x] = 0;
else if (temp >= 255.0)
out[x] = 255;
else
out[x] = (UINT8) temp;
}
}
}
return imOut;
}
Imaging
ImagingFillLinearGradient(const char *mode)
{
Imaging im;
int y;
if (strlen(mode) != 1)
return (Imaging) ImagingError_ModeError();
im = ImagingNew(mode, 256, 256);
if (!im)
return NULL;
for (y = 0; y < 256; y++)
memset(im->image8[y], (unsigned char) y, 256);
return im;
}
Imaging
ImagingNegative(Imaging im)
{
Imaging imOut;
int x, y;
if (!im)
return (Imaging) ImagingError_ModeError();
imOut = ImagingNew(im->mode, im->xsize, im->ysize);
if (!imOut)
return NULL;
for (y = 0; y < im->ysize; y++)
for (x = 0; x < im->linesize; x++)
imOut->image[y][x] = ~im->image[y][x];
return imOut;
}
Imaging
ImagingCrop(Imaging imIn, int sx0, int sy0, int sx1, int sy1)
{
Imaging imOut;
int xsize, ysize;
int dx0, dy0, dx1, dy1;
INT32 zero = 0;
if (!imIn)
return (Imaging) ImagingError_ModeError();
xsize = sx1 - sx0;
if (xsize < 0)
xsize = 0;
ysize = sy1 - sy0;
if (ysize < 0)
ysize = 0;
imOut = ImagingNew(imIn->mode, xsize, ysize);
if (!imOut)
return NULL;
ImagingCopyInfo(imOut, imIn);
if (sx0 < 0 || sy0 < 0 || sx1 > imIn->xsize || sy1 > imIn->ysize)
(void) ImagingFill(imOut, &zero);
dx0 = -sx0;
dy0 = -sy0;
dx1 = imIn->xsize - sx0;
dy1 = imIn->ysize - sy0;
/* paste the source image on top of the output image!!! */
if (ImagingPaste(imOut, imIn, NULL, dx0, dy0, dx1, dy1) < 0) {
ImagingDelete(imOut);
return NULL;
}
return imOut;
}
Imaging
ImagingGetBand(Imaging imIn, int band)
{
Imaging imOut;
int x, y;
/* Check arguments */
if (!imIn || imIn->type != IMAGING_TYPE_UINT8)
return (Imaging) ImagingError_ModeError();
if (band < 0 || band >= imIn->bands)
return (Imaging) ImagingError_ValueError("band index out of range");
/* Shortcuts */
if (imIn->bands == 1)
return ImagingCopy(imIn);
/* Special case for LXXA etc */
if (imIn->bands == 2 && band == 1)
band = 3;
imOut = ImagingNew("L", imIn->xsize, imIn->ysize);
if (!imOut)
return NULL;
/* Extract band from image */
for (y = 0; y < imIn->ysize; y++) {
UINT8* in = (UINT8*) imIn->image[y] + band;
UINT8* out = imOut->image8[y];
for (x = 0; x < imIn->xsize; x++) {
out[x] = *in;
in += 4;
}
}
return imOut;
}
Imaging
ImagingPutBand(Imaging imOut, Imaging imIn, int band)
{
int x, y;
/* Check arguments */
if (!imIn || imIn->bands != 1 || !imOut)
return (Imaging) ImagingError_ModeError();
if (band < 0 || band >= imOut->bands)
return (Imaging) ImagingError_ValueError("band index out of range");
if (imIn->type != imOut->type ||
imIn->xsize != imOut->xsize ||
imIn->ysize != imOut->ysize)
return (Imaging) ImagingError_Mismatch();
/* Shortcuts */
if (imOut->bands == 1)
return ImagingCopy2(imOut, imIn);
/* Special case for LXXA etc */
if (imOut->bands == 2 && band == 1)
band = 3;
/* Insert band into image */
for (y = 0; y < imIn->ysize; y++) {
UINT8* in = imIn->image8[y];
UINT8* out = (UINT8*) imOut->image[y] + band;
for (x = 0; x < imIn->xsize; x++) {
*out = in[x];
out += 4;
}
}
return imOut;
}
Imaging
ImagingFilter(Imaging im, int xsize, int ysize, const FLOAT32* kernel,
FLOAT32 offset, FLOAT32 divisor)
{
Imaging imOut;
int x, y;
FLOAT32 sum;
if (!im || strcmp(im->mode, "L") != 0)
return (Imaging) ImagingError_ModeError();
if (im->xsize < xsize || im->ysize < ysize)
return ImagingCopy(im);
if ((xsize != 3 && xsize != 5) || xsize != ysize)
return (Imaging) ImagingError_ValueError("bad kernel size");
imOut = ImagingNew(im->mode, im->xsize, im->ysize);
if (!imOut)
return NULL;
/* brute force kernel implementations */
#define KERNEL3x3(image, kernel, d) ( \
(int) image[y+1][x-d] * kernel[0] + \
(int) image[y+1][x] * kernel[1] + \
(int) image[y+1][x+d] * kernel[2] + \
(int) image[y][x-d] * kernel[3] + \
(int) image[y][x] * kernel[4] + \
(int) image[y][x+d] * kernel[5] + \
(int) image[y-1][x-d] * kernel[6] + \
(int) image[y-1][x] * kernel[7] + \
(int) image[y-1][x+d] * kernel[8])
#define KERNEL5x5(image, kernel, d) ( \
(int) image[y+2][x-d-d] * kernel[0] + \
(int) image[y+2][x-d] * kernel[1] + \
(int) image[y+2][x] * kernel[2] + \
(int) image[y+2][x+d] * kernel[3] + \
(int) image[y+2][x+d+d] * kernel[4] + \
(int) image[y+1][x-d-d] * kernel[5] + \
(int) image[y+1][x-d] * kernel[6] + \
(int) image[y+1][x] * kernel[7] + \
(int) image[y+1][x+d] * kernel[8] + \
(int) image[y+1][x+d+d] * kernel[9] + \
(int) image[y][x-d-d] * kernel[10] + \
(int) image[y][x-d] * kernel[11] + \
(int) image[y][x] * kernel[12] + \
(int) image[y][x+d] * kernel[13] + \
(int) image[y][x+d+d] * kernel[14] + \
(int) image[y-1][x-d-d] * kernel[15] + \
(int) image[y-1][x-d] * kernel[16] + \
(int) image[y-1][x] * kernel[17] + \
(int) image[y-1][x+d] * kernel[18] + \
(int) image[y-1][x+d+d] * kernel[19] + \
(int) image[y-2][x-d-d] * kernel[20] + \
(int) image[y-2][x-d] * kernel[21] + \
(int) image[y-2][x] * kernel[22] + \
(int) image[y-2][x+d] * kernel[23] + \
(int) image[y-2][x+d+d] * kernel[24])
if (xsize == 3) {
/* 3x3 kernel. */
for (x = 0; x < im->xsize; x++)
imOut->image[0][x] = im->image8[0][x];
for (y = 1; y < im->ysize-1; y++) {
imOut->image[y][0] = im->image8[y][0];
for (x = 1; x < im->xsize-1; x++) {
sum = KERNEL3x3(im->image8, kernel, 1) / divisor + offset;
if (sum <= 0)
imOut->image8[y][x] = 0;
else if (sum >= 255)
imOut->image8[y][x] = 255;
else
imOut->image8[y][x] = (UINT8) sum;
}
imOut->image8[y][x] = im->image8[y][x];
}
for (x = 0; x < im->xsize; x++)
imOut->image8[y][x] = im->image8[y][x];
} else {
/* 5x5 kernel. */
for (y = 0; y < 2; y++)
for (x = 0; x < im->xsize; x++)
imOut->image8[y][x] = im->image8[y][x];
for (; y < im->ysize-2; y++) {
for (x = 0; x < 2; x++)
imOut->image8[y][x] = im->image8[y][x];
for (; x < im->xsize-2; x++) {
sum = KERNEL5x5(im->image8, kernel, 1) / divisor + offset;
if (sum <= 0)
imOut->image8[y][x] = 0;
else if (sum >= 255)
imOut->image8[y][x] = 255;
else
imOut->image8[y][x] = (UINT8) sum;
}
for (; x < im->xsize; x++)
imOut->image8[y][x] = im->image8[y][x];
}
for (; y < im->ysize; y++)
for (x = 0; x < im->xsize; x++)
imOut->image8[y][x] = im->image8[y][x];
}
return imOut;
}
Imaging
ImagingUnsharpMask(Imaging im, Imaging imOut, float radius, int percent,
int threshold)
{
ImagingSectionCookie cookie;
Imaging result;
int channel = 0;
int channels = 0;
int padding = 0;
int x = 0;
int y = 0;
int *lineIn = NULL;
int *lineOut = NULL;
UINT8 *lineIn8 = NULL;
UINT8 *lineOut8 = NULL;
int diff = 0;
INT32 newPixel = 0;
if (strcmp(im->mode, "RGB") == 0) {
channels = 3;
padding = 1;
} else if (strcmp(im->mode, "RGBA") == 0) {
channels = 3;
padding = 1;
} else if (strcmp(im->mode, "RGBX") == 0) {
channels = 3;
padding = 1;
} else if (strcmp(im->mode, "CMYK") == 0) {
channels = 4;
padding = 0;
} else if (strcmp(im->mode, "L") == 0) {
channels = 1;
padding = 0;
} else
return ImagingError_ModeError();
/* first, do a gaussian blur on the image, putting results in imOut
temporarily */
result = gblur(im, imOut, radius, channels, padding);
if (!result)
return NULL;
/* now, go through each pixel, compare "normal" pixel to blurred
pixel. if the difference is more than threshold values, apply
the OPPOSITE correction to the amount of blur, multiplied by
percent. */
ImagingSectionEnter(&cookie);
for (y = 0; y < im->ysize; y++) {
if (channels == 1) {
lineIn8 = im->image8[y];
lineOut8 = imOut->image8[y];
} else {
lineIn = im->image32[y];
lineOut = imOut->image32[y];
}
for (x = 0; x < im->xsize; x++) {
newPixel = 0;
/* compare in/out pixels, apply sharpening */
if (channels == 1) {
diff =
((UINT8 *) & lineIn8[x])[0] -
((UINT8 *) & lineOut8[x])[0];
if (abs(diff) > threshold) {
/* add the diff*percent to the original pixel */
imOut->image8[y][x] =
clip((((UINT8 *) & lineIn8[x])[0]) +
(diff * ((float) percent) / 100.0));
} else {
/* newPixel is the same as imIn */
imOut->image8[y][x] = ((UINT8 *) & lineIn8[x])[0];
}
}
else {
for (channel = 0; channel < channels; channel++) {
diff = (int) ((((UINT8 *) & lineIn[x])[channel]) -
(((UINT8 *) & lineOut[x])[channel]));
if (abs(diff) > threshold) {
/* add the diff*percent to the original pixel
this may not work for little-endian systems, fix it! */
newPixel =
newPixel |
clip((float) (((UINT8 *) & lineIn[x])[channel])
+
(diff *
(((float) percent /
100.0)))) << (channel * 8);
} else {
/* newPixel is the same as imIn
this may not work for little-endian systems, fix it! */
newPixel =
newPixel | ((UINT8 *) & lineIn[x])[channel] <<
(channel * 8);
}
}
if (strcmp(im->mode, "RGBX") == 0
|| strcmp(im->mode, "RGBA") == 0) {
/* preserve the alpha channel
this may not work for little-endian systems, fix it! */
newPixel =
newPixel | ((UINT8 *) & lineIn[x])[channel] << 24;
}
imOut->image32[y][x] = newPixel;
}
}
}
ImagingSectionLeave(&cookie);
return imOut;
}
ImagingHistogram
ImagingGetHistogram(Imaging im, Imaging imMask, void* minmax)
{
ImagingSectionCookie cookie;
int x, y, i;
ImagingHistogram h;
INT32 imin, imax;
FLOAT32 fmin, fmax, scale;
if (!im)
return ImagingError_ModeError();
if (imMask) {
/* Validate mask */
if (im->xsize != imMask->xsize || im->ysize != imMask->ysize)
return ImagingError_Mismatch();
if (strcmp(imMask->mode, "1") != 0 && strcmp(imMask->mode, "L") != 0)
return ImagingError_ValueError("bad transparency mask");
}
h = ImagingHistogramNew(im);
if (imMask) {
/* mask */
if (im->image8) {
ImagingSectionEnter(&cookie);
for (y = 0; y < im->ysize; y++)
for (x = 0; x < im->xsize; x++)
if (imMask->image8[y][x] != 0)
h->histogram[im->image8[y][x]]++;
ImagingSectionLeave(&cookie);
} else { /* yes, we need the braces. C isn't Python! */
if (im->type != IMAGING_TYPE_UINT8)
return ImagingError_ModeError();
ImagingSectionEnter(&cookie);
for (y = 0; y < im->ysize; y++) {
UINT8* in = (UINT8*) im->image32[y];
for (x = 0; x < im->xsize; x++)
if (imMask->image8[y][x] != 0) {
h->histogram[(*in++)]++;
h->histogram[(*in++)+256]++;
h->histogram[(*in++)+512]++;
h->histogram[(*in++)+768]++;
} else
in += 4;
}
ImagingSectionLeave(&cookie);
}
} else {
/* mask not given; process pixels in image */
if (im->image8) {
ImagingSectionEnter(&cookie);
for (y = 0; y < im->ysize; y++)
for (x = 0; x < im->xsize; x++)
h->histogram[im->image8[y][x]]++;
ImagingSectionLeave(&cookie);
} else {
switch (im->type) {
case IMAGING_TYPE_UINT8:
ImagingSectionEnter(&cookie);
for (y = 0; y < im->ysize; y++) {
UINT8* in = (UINT8*) im->image[y];
for (x = 0; x < im->xsize; x++) {
h->histogram[(*in++)]++;
h->histogram[(*in++)+256]++;
h->histogram[(*in++)+512]++;
h->histogram[(*in++)+768]++;
}
}
ImagingSectionLeave(&cookie);
break;
case IMAGING_TYPE_INT32:
if (!minmax)
return ImagingError_ValueError("min/max not given");
if (!im->xsize || !im->ysize)
break;
imin = ((INT32*) minmax)[0];
imax = ((INT32*) minmax)[1];
if (imin >= imax)
break;
ImagingSectionEnter(&cookie);
scale = 255.0F / (imax - imin);
for (y = 0; y < im->ysize; y++) {
INT32* in = im->image32[y];
for (x = 0; x < im->xsize; x++) {
i = (int) (((*in++)-imin)*scale);
if (i >= 0 && i < 256)
h->histogram[i]++;
}
}
ImagingSectionLeave(&cookie);
break;
case IMAGING_TYPE_FLOAT32:
if (!minmax)
return ImagingError_ValueError("min/max not given");
if (!im->xsize || !im->ysize)
break;
fmin = ((FLOAT32*) minmax)[0];
fmax = ((FLOAT32*) minmax)[1];
if (fmin >= fmax)
break;
ImagingSectionEnter(&cookie);
scale = 255.0F / (fmax - fmin);
for (y = 0; y < im->ysize; y++) {
FLOAT32* in = (FLOAT32*) im->image32[y];
for (x = 0; x < im->xsize; x++) {
i = (int) (((*in++)-fmin)*scale);
if (i >= 0 && i < 256)
h->histogram[i]++;
}
}
ImagingSectionLeave(&cookie);
break;
}
}
}
return h;
}
int
ImagingFill2(Imaging imOut, const void* ink, Imaging imMask,
int dx0, int dy0, int dx1, int dy1)
{
ImagingSectionCookie cookie;
int xsize, ysize;
int pixelsize;
int sx0, sy0;
if (!imOut || !ink) {
(void) ImagingError_ModeError();
return -1;
}
pixelsize = imOut->pixelsize;
xsize = dx1 - dx0;
ysize = dy1 - dy0;
if (imMask && (xsize != imMask->xsize || ysize != imMask->ysize)) {
(void) ImagingError_Mismatch();
return -1;
}
/* Determine which region to fill */
sx0 = sy0 = 0;
if (dx0 < 0)
xsize += dx0, sx0 = -dx0, dx0 = 0;
if (dx0 + xsize > imOut->xsize)
xsize = imOut->xsize - dx0;
if (dy0 < 0)
ysize += dy0, sy0 = -dy0, dy0 = 0;
if (dy0 + ysize > imOut->ysize)
ysize = imOut->ysize - dy0;
if (xsize <= 0 || ysize <= 0)
return 0;
if (!imMask) {
ImagingSectionEnter(&cookie);
fill(imOut, ink, dx0, dy0, xsize, ysize, pixelsize);
ImagingSectionLeave(&cookie);
} else if (strcmp(imMask->mode, "1") == 0) {
ImagingSectionEnter(&cookie);
fill_mask_1(imOut, ink, imMask, dx0, dy0, sx0, sy0,
xsize, ysize, pixelsize);
ImagingSectionLeave(&cookie);
} else if (strcmp(imMask->mode, "L") == 0) {
ImagingSectionEnter(&cookie);
fill_mask_L(imOut, ink, imMask, dx0, dy0, sx0, sy0,
xsize, ysize, pixelsize);
ImagingSectionLeave(&cookie);
} else if (strcmp(imMask->mode, "RGBA") == 0) {
ImagingSectionEnter(&cookie);
fill_mask_RGBA(imOut, ink, imMask, dx0, dy0, sx0, sy0,
xsize, ysize, pixelsize);
ImagingSectionLeave(&cookie);
} else if (strcmp(imMask->mode, "RGBa") == 0) {
ImagingSectionEnter(&cookie);
fill_mask_RGBa(imOut, ink, imMask, dx0, dy0, sx0, sy0,
xsize, ysize, pixelsize);
ImagingSectionLeave(&cookie);
} else {
(void) ImagingError_ValueError("bad transparency mask");
return -1;
}
return 0;
}
ImagingDIB
ImagingNewDIB(const char *mode, int xsize, int ysize)
{
/* Create a Windows bitmap */
ImagingDIB dib;
RGBQUAD *palette;
int i;
/* Check mode */
if (strcmp(mode, "1") != 0 && strcmp(mode, "L") != 0 &&
strcmp(mode, "RGB") != 0)
return (ImagingDIB) ImagingError_ModeError();
/* Create DIB context and info header */
/* malloc check ok, small constant allocation */
dib = (ImagingDIB) malloc(sizeof(*dib));
if (!dib)
return (ImagingDIB) ImagingError_MemoryError();
/* malloc check ok, small constant allocation */
dib->info = (BITMAPINFO*) malloc(sizeof(BITMAPINFOHEADER) +
256 * sizeof(RGBQUAD));
if (!dib->info) {
free(dib);
return (ImagingDIB) ImagingError_MemoryError();
}
memset(dib->info, 0, sizeof(BITMAPINFOHEADER));
dib->info->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
dib->info->bmiHeader.biWidth = xsize;
dib->info->bmiHeader.biHeight = ysize;
dib->info->bmiHeader.biPlanes = 1;
dib->info->bmiHeader.biBitCount = strlen(mode)*8;
dib->info->bmiHeader.biCompression = BI_RGB;
/* Create DIB */
dib->dc = CreateCompatibleDC(NULL);
if (!dib->dc) {
free(dib->info);
free(dib);
return (ImagingDIB) ImagingError_MemoryError();
}
dib->bitmap = CreateDIBSection(dib->dc, dib->info, DIB_RGB_COLORS,
&dib->bits, NULL, 0);
if (!dib->bitmap) {
free(dib->info);
free(dib);
return (ImagingDIB) ImagingError_MemoryError();
}
strcpy(dib->mode, mode);
dib->xsize = xsize;
dib->ysize = ysize;
dib->pixelsize = strlen(mode);
dib->linesize = (xsize * dib->pixelsize + 3) & -4;
if (dib->pixelsize == 1)
dib->pack = dib->unpack = (ImagingShuffler) memcpy;
else {
dib->pack = ImagingPackBGR;
dib->unpack = ImagingPackBGR;
}
/* Bind the DIB to the device context */
dib->old_bitmap = SelectObject(dib->dc, dib->bitmap);
palette = dib->info->bmiColors;
/* Bind a palette to it as well (only required for 8-bit DIBs) */
if (dib->pixelsize == 1) {
for (i = 0; i < 256; i++) {
palette[i].rgbRed =
palette[i].rgbGreen =
palette[i].rgbBlue = i;
palette[i].rgbReserved = 0;
}
SetDIBColorTable(dib->dc, 0, 256, palette);
}
/* Create an associated palette (for 8-bit displays only) */
if (strcmp(ImagingGetModeDIB(NULL), "P") == 0) {
char palbuf[sizeof(LOGPALETTE)+256*sizeof(PALETTEENTRY)];
LPLOGPALETTE pal = (LPLOGPALETTE) palbuf;
int i, r, g, b;
/* Load system palette */
pal->palVersion = 0x300;
pal->palNumEntries = 256;
GetSystemPaletteEntries(dib->dc, 0, 256, pal->palPalEntry);
if (strcmp(mode, "L") == 0) {
/* Greyscale DIB. Fill all 236 slots with a greyscale ramp
* (this is usually overkill on Windows since VGA only offers
* 6 bits greyscale resolution). Ignore the slots already
* allocated by Windows */
i = 10;
for (r = 0; r < 236; r++) {
pal->palPalEntry[i].peRed =
pal->palPalEntry[i].peGreen =
pal->palPalEntry[i].peBlue = i;
i++;
}
dib->palette = CreatePalette(pal);
} else if (strcmp(mode, "RGB") == 0) {
#ifdef CUBE216
/* Colour DIB. Create a 6x6x6 colour cube (216 entries) and
* add 20 extra greylevels for best result with greyscale
* images. */
i = 10;
for (r = 0; r < 256; r += 51)
for (g = 0; g < 256; g += 51)
for (b = 0; b < 256; b += 51) {
pal->palPalEntry[i].peRed = r;
pal->palPalEntry[i].peGreen = g;
pal->palPalEntry[i].peBlue = b;
i++;
}
for (r = 1; r < 22-1; r++) {
/* Black and white are already provided by the cube. */
pal->palPalEntry[i].peRed =
pal->palPalEntry[i].peGreen =
pal->palPalEntry[i].peBlue = r * 255 / (22-1);
i++;
}
#else
/* Colour DIB. Alternate palette. */
i = 10;
for (r = 0; r < 256; r += 37)
for (g = 0; g < 256; g += 32)
for (b = 0; b < 256; b += 64) {
pal->palPalEntry[i].peRed = r;
pal->palPalEntry[i].peGreen = g;
pal->palPalEntry[i].peBlue = b;
i++;
}
#endif
dib->palette = CreatePalette(pal);
}
}
return dib;
}
Imaging
ImagingPoint(Imaging imIn, const char* mode, const void* table)
{
/* lookup table transform */
ImagingSectionCookie cookie;
Imaging imOut;
im_point_context context;
void (*point)(Imaging imIn, Imaging imOut, im_point_context* context);
if (!imIn)
return (Imaging) ImagingError_ModeError();
if (!mode)
mode = imIn->mode;
if (imIn->type != IMAGING_TYPE_UINT8) {
if (imIn->type != IMAGING_TYPE_INT32 || strcmp(mode, "L") != 0)
goto mode_mismatch;
} else if (!imIn->image8 && strcmp(imIn->mode, mode) != 0)
goto mode_mismatch;
imOut = ImagingNew(mode, imIn->xsize, imIn->ysize);
if (!imOut)
return NULL;
/* find appropriate handler */
if (imIn->type == IMAGING_TYPE_UINT8) {
if (imIn->bands == imOut->bands && imIn->type == imOut->type) {
switch (imIn->bands) {
case 1:
point = im_point_8_8;
break;
case 2:
point = im_point_2x8_2x8;
break;
case 3:
point = im_point_3x8_3x8;
break;
case 4:
point = im_point_4x8_4x8;
break;
default:
/* this cannot really happen */
point = im_point_8_8;
break;
}
} else
point = im_point_8_32;
} else
point = im_point_32_8;
ImagingCopyInfo(imOut, imIn);
ImagingSectionEnter(&cookie);
context.table = table;
point(imOut, imIn, &context);
ImagingSectionLeave(&cookie);
return imOut;
mode_mismatch:
return (Imaging) ImagingError_ValueError(
"point operation not supported for this mode"
);
}
Imaging
ImagingAlphaComposite(Imaging imDst, Imaging imSrc)
{
Imaging imOut;
int x, y;
/* Check arguments */
if (!imDst || !imSrc ||
strcmp(imDst->mode, "RGBA") ||
imDst->type != IMAGING_TYPE_UINT8 ||
imDst->bands != 4)
return ImagingError_ModeError();
if (strcmp(imDst->mode, imSrc->mode) ||
imDst->type != imSrc->type ||
imDst->bands != imSrc->bands ||
imDst->xsize != imSrc->xsize ||
imDst->ysize != imSrc->ysize)
return ImagingError_Mismatch();
imOut = ImagingNew(imDst->mode, imDst->xsize, imDst->ysize);
if (!imOut)
return NULL;
ImagingCopyInfo(imOut, imDst);
for (y = 0; y < imDst->ysize; y++) {
rgba8* dst = (rgba8*) imDst->image[y];
rgba8* src = (rgba8*) imSrc->image[y];
rgba8* out = (rgba8*) imOut->image[y];
for (x = 0; x < imDst->xsize; x ++) {
if (src->a == 0) {
// Copy 4 bytes at once.
*out = *dst;
} else {
// Integer implementation with increased precision.
// Each variable has extra meaningful bits.
// Divisions are rounded.
// This code uses trick from Paste.c:
// (a + (2 << (n-1)) - 1) / ((2 << n)-1)
// almost equivalent to:
// tmp = a + (2 << (n-1)), ((tmp >> n) + tmp) >> n
UINT16 blend = dst->a * (255 - src->a);
UINT16 outa255 = src->a * 255 + blend;
// There we use 7 bits for precision.
// We could use more, but we go beyond 32 bits.
UINT16 coef1 = src->a * 255 * 255 * 128 / outa255;
UINT16 coef2 = blend * 255 * 128 / outa255;
#define SHIFTFORDIV255(a)\
((a >> 8) + a >> 8)
UINT32 tmpr = src->r * coef1 + dst->r * coef2 + (0x80 << 7);
out->r = SHIFTFORDIV255(tmpr) >> 7;
UINT32 tmpg = src->g * coef1 + dst->g * coef2 + (0x80 << 7);
out->g = SHIFTFORDIV255(tmpg) >> 7;
UINT32 tmpb = src->b * coef1 + dst->b * coef2 + (0x80 << 7);
out->b = SHIFTFORDIV255(tmpb) >> 7;
out->a = SHIFTFORDIV255(outa255 + 0x80);
}
dst++; src++; out++;
}
}
return imOut;
}
Imaging
ImagingPointTransform(Imaging imIn, double scale, double offset)
{
/* scale/offset transform */
ImagingSectionCookie cookie;
Imaging imOut;
int x, y;
if (!imIn || (strcmp(imIn->mode, "I") != 0 &&
strcmp(imIn->mode, "I;16") != 0 &&
strcmp(imIn->mode, "F") != 0))
return (Imaging) ImagingError_ModeError();
imOut = ImagingNew(imIn->mode, imIn->xsize, imIn->ysize);
if (!imOut)
return NULL;
ImagingCopyInfo(imOut, imIn);
switch (imIn->type) {
case IMAGING_TYPE_INT32:
ImagingSectionEnter(&cookie);
for (y = 0; y < imIn->ysize; y++) {
INT32* in = imIn->image32[y];
INT32* out = imOut->image32[y];
/* FIXME: add clipping? */
for (x = 0; x < imIn->xsize; x++)
out[x] = in[x] * scale + offset;
}
ImagingSectionLeave(&cookie);
break;
case IMAGING_TYPE_FLOAT32:
ImagingSectionEnter(&cookie);
for (y = 0; y < imIn->ysize; y++) {
FLOAT32* in = (FLOAT32*) imIn->image32[y];
FLOAT32* out = (FLOAT32*) imOut->image32[y];
for (x = 0; x < imIn->xsize; x++)
out[x] = in[x] * scale + offset;
}
ImagingSectionLeave(&cookie);
break;
case IMAGING_TYPE_SPECIAL:
if (strcmp(imIn->mode,"I;16") == 0) {
ImagingSectionEnter(&cookie);
for (y = 0; y < imIn->ysize; y++) {
UINT16* in = (UINT16 *)imIn->image[y];
UINT16* out = (UINT16 *)imOut->image[y];
/* FIXME: add clipping? */
for (x = 0; x < imIn->xsize; x++)
out[x] = in[x] * scale + offset;
}
ImagingSectionLeave(&cookie);
break;
}
/* FALL THROUGH */
default:
ImagingDelete(imOut);
return (Imaging) ImagingError_ValueError("internal error");
}
return imOut;
}
Imaging
ImagingStretch(Imaging imOut, Imaging imIn, int filter)
{
/* FIXME: this is a quick and straightforward translation from a
python prototype. might need some further C-ification... */
ImagingSectionCookie cookie;
struct filter *filterp;
float support, scale, filterscale;
float center, ww, ss, ymin, ymax, xmin, xmax;
int xx, yy, x, y, b;
float *k;
/* check modes */
if (!imOut || !imIn || strcmp(imIn->mode, imOut->mode) != 0)
return (Imaging) ImagingError_ModeError();
/* check filter */
switch (filter) {
case IMAGING_TRANSFORM_NEAREST:
filterp = &NEAREST;
break;
case IMAGING_TRANSFORM_ANTIALIAS:
filterp = &ANTIALIAS;
break;
case IMAGING_TRANSFORM_BILINEAR:
filterp = &BILINEAR;
break;
case IMAGING_TRANSFORM_BICUBIC:
filterp = &BICUBIC;
break;
default:
return (Imaging) ImagingError_ValueError(
"unsupported resampling filter"
);
}
if (imIn->ysize == imOut->ysize) {
/* prepare for horizontal stretch */
filterscale = scale = (float) imIn->xsize / imOut->xsize;
} else if (imIn->xsize == imOut->xsize) {
/* prepare for vertical stretch */
filterscale = scale = (float) imIn->ysize / imOut->ysize;
} else
return (Imaging) ImagingError_Mismatch();
/* determine support size (length of resampling filter) */
support = filterp->support;
if (filterscale < 1.0) {
filterscale = 1.0;
support = 0.5;
}
support = support * filterscale;
/* coefficient buffer (with rounding safety margin) */
k = malloc(((int) support * 2 + 10) * sizeof(float));
if (!k)
return (Imaging) ImagingError_MemoryError();
ImagingSectionEnter(&cookie);
if (imIn->xsize == imOut->xsize) {
/* vertical stretch */
for (yy = 0; yy < imOut->ysize; yy++) {
center = (yy + 0.5) * scale;
ww = 0.0;
ss = 1.0 / filterscale;
/* calculate filter weights */
ymin = floor(center - support);
if (ymin < 0.0)
ymin = 0.0;
ymax = ceil(center + support);
if (ymax > (float) imIn->ysize)
ymax = (float) imIn->ysize;
for (y = (int) ymin; y < (int) ymax; y++) {
float w = filterp->filter((y - center + 0.5) * ss) * ss;
k[y - (int) ymin] = w;
ww = ww + w;
}
if (ww == 0.0)
ww = 1.0;
else
ww = 1.0 / ww;
if (imIn->image8) {
/* 8-bit grayscale */
for (xx = 0; xx < imOut->xsize; xx++) {
ss = 0.0;
for (y = (int) ymin; y < (int) ymax; y++)
ss = ss + imIn->image8[y][xx] * k[y - (int) ymin];
ss = ss * ww + 0.5;
if (ss < 0.5)
imOut->image8[yy][xx] = 0;
else if (ss >= 255.0)
imOut->image8[yy][xx] = 255;
else
imOut->image8[yy][xx] = (UINT8) ss;
}
} else
switch(imIn->type) {
case IMAGING_TYPE_UINT8:
/* n-bit grayscale */
for (xx = 0; xx < imOut->xsize*4; xx++) {
/* FIXME: skip over unused pixels */
ss = 0.0;
for (y = (int) ymin; y < (int) ymax; y++)
ss = ss + (UINT8) imIn->image[y][xx] * k[y-(int) ymin];
ss = ss * ww + 0.5;
if (ss < 0.5)
imOut->image[yy][xx] = (UINT8) 0;
else if (ss >= 255.0)
imOut->image[yy][xx] = (UINT8) 255;
else
imOut->image[yy][xx] = (UINT8) ss;
}
break;
case IMAGING_TYPE_INT32:
/* 32-bit integer */
for (xx = 0; xx < imOut->xsize; xx++) {
ss = 0.0;
for (y = (int) ymin; y < (int) ymax; y++)
ss = ss + IMAGING_PIXEL_I(imIn, xx, y) * k[y - (int) ymin];
IMAGING_PIXEL_I(imOut, xx, yy) = (int) ss * ww;
}
break;
case IMAGING_TYPE_FLOAT32:
/* 32-bit float */
for (xx = 0; xx < imOut->xsize; xx++) {
ss = 0.0;
for (y = (int) ymin; y < (int) ymax; y++)
ss = ss + IMAGING_PIXEL_F(imIn, xx, y) * k[y - (int) ymin];
IMAGING_PIXEL_F(imOut, xx, yy) = ss * ww;
}
break;
default:
ImagingSectionLeave(&cookie);
return (Imaging) ImagingError_ModeError();
}
}
} else {
/* horizontal stretch */
for (xx = 0; xx < imOut->xsize; xx++) {
center = (xx + 0.5) * scale;
ww = 0.0;
ss = 1.0 / filterscale;
xmin = floor(center - support);
if (xmin < 0.0)
xmin = 0.0;
xmax = ceil(center + support);
if (xmax > (float) imIn->xsize)
xmax = (float) imIn->xsize;
for (x = (int) xmin; x < (int) xmax; x++) {
float w = filterp->filter((x - center + 0.5) * ss) * ss;
k[x - (int) xmin] = w;
ww = ww + w;
}
if (ww == 0.0)
ww = 1.0;
else
ww = 1.0 / ww;
if (imIn->image8) {
/* 8-bit grayscale */
for (yy = 0; yy < imOut->ysize; yy++) {
ss = 0.0;
for (x = (int) xmin; x < (int) xmax; x++)
ss = ss + imIn->image8[yy][x] * k[x - (int) xmin];
ss = ss * ww + 0.5;
if (ss < 0.5)
imOut->image8[yy][xx] = (UINT8) 0;
else if (ss >= 255.0)
imOut->image8[yy][xx] = (UINT8) 255;
else
imOut->image8[yy][xx] = (UINT8) ss;
}
} else
switch(imIn->type) {
case IMAGING_TYPE_UINT8:
/* n-bit grayscale */
for (yy = 0; yy < imOut->ysize; yy++) {
for (b = 0; b < imIn->bands; b++) {
if (imIn->bands == 2 && b)
b = 3; /* hack to deal with LA images */
ss = 0.0;
for (x = (int) xmin; x < (int) xmax; x++)
ss = ss + (UINT8) imIn->image[yy][x*4+b] * k[x - (int) xmin];
ss = ss * ww + 0.5;
if (ss < 0.5)
imOut->image[yy][xx*4+b] = (UINT8) 0;
else if (ss >= 255.0)
imOut->image[yy][xx*4+b] = (UINT8) 255;
else
imOut->image[yy][xx*4+b] = (UINT8) ss;
}
}
break;
case IMAGING_TYPE_INT32:
/* 32-bit integer */
for (yy = 0; yy < imOut->ysize; yy++) {
ss = 0.0;
for (x = (int) xmin; x < (int) xmax; x++)
ss = ss + IMAGING_PIXEL_I(imIn, x, yy) * k[x - (int) xmin];
IMAGING_PIXEL_I(imOut, xx, yy) = (int) ss * ww;
}
break;
case IMAGING_TYPE_FLOAT32:
/* 32-bit float */
for (yy = 0; yy < imOut->ysize; yy++) {
ss = 0.0;
for (x = (int) xmin; x < (int) xmax; x++)
ss = ss + IMAGING_PIXEL_F(imIn, x, yy) * k[x - (int) xmin];
IMAGING_PIXEL_F(imOut, xx, yy) = ss * ww;
}
break;
default:
ImagingSectionLeave(&cookie);
return (Imaging) ImagingError_ModeError();
}
}
}
ImagingSectionLeave(&cookie);
free(k);
return imOut;
}
