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-rw-r--r--kdeprint/cups/image.cpp295
1 files changed, 295 insertions, 0 deletions
diff --git a/kdeprint/cups/image.cpp b/kdeprint/cups/image.cpp
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+++ b/kdeprint/cups/image.cpp
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+/*
+ * This file is part of the KDE libraries
+ * Copyright (c) 2001 Michael Goffioul <kdeprint@swing.be>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License version 2 as published by the Free Software Foundation.
+ *
+ * This library 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public License
+ * along with this library; see the file COPYING.LIB. If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ **/
+
+#include <qimage.h>
+#include <math.h>
+
+void
+mult(float a[3][3], /* I - First matrix */
+ float b[3][3], /* I - Second matrix */
+ float c[3][3]) /* I - Destination matrix */
+{
+ int x, y; /* Looping vars */
+ float temp[3][3]; /* Temporary matrix */
+
+
+ /*
+ * Multiply a and b, putting the result in temp...
+ */
+
+ for (y = 0; y < 3; y ++)
+ for (x = 0; x < 3; x ++)
+ temp[y][x] = b[y][0] * a[0][x] +
+ b[y][1] * a[1][x] +
+ b[y][2] * a[2][x];
+
+ /*
+ * Copy temp to c (that way c can be a pointer to a or b).
+ */
+
+ memcpy(c, temp, sizeof(temp));
+}
+
+void
+saturate(float mat[3][3], /* I - Matrix to append to */
+ float sat) /* I - Desired color saturation */
+{
+ float smat[3][3]; /* Saturation matrix */
+
+
+ smat[0][0] = (1.0 - sat) * 0.3086 + sat;
+ smat[0][1] = (1.0 - sat) * 0.3086;
+ smat[0][2] = (1.0 - sat) * 0.3086;
+ smat[1][0] = (1.0 - sat) * 0.6094;
+ smat[1][1] = (1.0 - sat) * 0.6094 + sat;
+ smat[1][2] = (1.0 - sat) * 0.6094;
+ smat[2][0] = (1.0 - sat) * 0.0820;
+ smat[2][1] = (1.0 - sat) * 0.0820;
+ smat[2][2] = (1.0 - sat) * 0.0820 + sat;
+
+ mult(smat, mat, mat);
+}
+
+void
+xform(float mat[3][3], /* I - Matrix */
+ float x, /* I - Input X coordinate */
+ float y, /* I - Input Y coordinate */
+ float z, /* I - Input Z coordinate */
+ float *tx, /* O - Output X coordinate */
+ float *ty, /* O - Output Y coordinate */
+ float *tz) /* O - Output Z coordinate */
+{
+ *tx = x * mat[0][0] + y * mat[1][0] + z * mat[2][0];
+ *ty = x * mat[0][1] + y * mat[1][1] + z * mat[2][1];
+ *tz = x * mat[0][2] + y * mat[1][2] + z * mat[2][2];
+}
+
+void
+xrotate(float mat[3][3], /* I - Matrix */
+ float rs, /* I - Rotation angle sine */
+ float rc) /* I - Rotation angle cosine */
+{
+ float rmat[3][3]; /* I - Rotation matrix */
+
+
+ rmat[0][0] = 1.0;
+ rmat[0][1] = 0.0;
+ rmat[0][2] = 0.0;
+
+ rmat[1][0] = 0.0;
+ rmat[1][1] = rc;
+ rmat[1][2] = rs;
+
+ rmat[2][0] = 0.0;
+ rmat[2][1] = -rs;
+ rmat[2][2] = rc;
+
+ mult(rmat, mat, mat);
+}
+
+void
+yrotate(float mat[3][3], /* I - Matrix */
+ float rs, /* I - Rotation angle sine */
+ float rc) /* I - Rotation angle cosine */
+{
+ float rmat[3][3]; /* I - Rotation matrix */
+
+
+ rmat[0][0] = rc;
+ rmat[0][1] = 0.0;
+ rmat[0][2] = -rs;
+
+ rmat[1][0] = 0.0;
+ rmat[1][1] = 1.0;
+ rmat[1][2] = 0.0;
+
+ rmat[2][0] = rs;
+ rmat[2][1] = 0.0;
+ rmat[2][2] = rc;
+
+ mult(rmat,mat,mat);
+}
+
+void
+zrotate(float mat[3][3], /* I - Matrix */
+ float rs, /* I - Rotation angle sine */
+ float rc) /* I - Rotation angle cosine */
+{
+ float rmat[3][3]; /* I - Rotation matrix */
+
+
+ rmat[0][0] = rc;
+ rmat[0][1] = rs;
+ rmat[0][2] = 0.0;
+
+ rmat[1][0] = -rs;
+ rmat[1][1] = rc;
+ rmat[1][2] = 0.0;
+
+ rmat[2][0] = 0.0;
+ rmat[2][1] = 0.0;
+ rmat[2][2] = 1.0;
+
+ mult(rmat,mat,mat);
+}
+
+void
+zshear(float mat[3][3], /* I - Matrix */
+ float dx, /* I - X shear */
+ float dy) /* I - Y shear */
+{
+ float smat[3][3]; /* Shear matrix */
+
+
+ smat[0][0] = 1.0;
+ smat[0][1] = 0.0;
+ smat[0][2] = dx;
+
+ smat[1][0] = 0.0;
+ smat[1][1] = 1.0;
+ smat[1][2] = dy;
+
+ smat[2][0] = 0.0;
+ smat[2][1] = 0.0;
+ smat[2][2] = 1.0;
+
+ mult(smat, mat, mat);
+}
+
+void
+huerotate(float mat[3][3], /* I - Matrix to append to */
+ float rot) /* I - Hue rotation in degrees */
+{
+ float hmat[3][3] = {{1.0,0.0,0.0},{0.0,1.0,0.0},{0.0,0.0,1.0}}; /* Hue matrix */
+ float lx, ly, lz; /* Luminance vector */
+ float xrs, xrc; /* X rotation sine/cosine */
+ float yrs, yrc; /* Y rotation sine/cosine */
+ float zrs, zrc; /* Z rotation sine/cosine */
+ float zsx, zsy; /* Z shear x/y */
+
+
+ /*
+ * Rotate the gray vector into positive Z...
+ */
+
+ xrs = M_SQRT1_2;
+ xrc = M_SQRT1_2;
+ xrotate(hmat,xrs,xrc);
+
+ yrs = -1.0 / sqrt(3.0);
+ yrc = -M_SQRT2 * yrs;
+ yrotate(hmat,yrs,yrc);
+
+ /*
+ * Shear the space to make the luminance plane horizontal...
+ */
+
+ xform(hmat, 0.3086, 0.6094, 0.0820, &lx, &ly, &lz);
+ zsx = lx / lz;
+ zsy = ly / lz;
+ zshear(hmat, zsx, zsy);
+
+ /*
+ * Rotate the hue...
+ */
+
+ zrs = sin(rot * M_PI / 180.0);
+ zrc = cos(rot * M_PI / 180.0);
+
+ zrotate(hmat, zrs, zrc);
+
+ /*
+ * Unshear the space to put the luminance plane back...
+ */
+
+ zshear(hmat, -zsx, -zsy);
+
+ /*
+ * Rotate the gray vector back into place...
+ */
+
+ yrotate(hmat, -yrs, yrc);
+ xrotate(hmat, -xrs, xrc);
+
+ /*
+ * Append it to the current matrix...
+ */
+
+ mult(hmat, mat, mat);
+}
+
+void
+bright(float mat[3][3],
+ float scale)
+{
+ for (int i=0;i<3;i++)
+ for (int j=0;j<3;j++)
+ mat[i][j] *= scale;
+}
+
+//----------------------------------------------------------------------------------------------------
+
+QImage convertImage(const QImage& image, int hue, int saturation, int brightness, int gamma)
+{
+ float mat[3][3] = {{1.0,0.0,0.0},{0.0,1.0,0.0},{0.0,0.0,1.0}};
+ int lut[3][3][256];
+ QRgb c;
+ int r,g,b,v,r2,g2,b2;
+ float gam = 1.0/(float(gamma)/1000.0);
+ QImage img(image);
+
+ saturate(mat,saturation*0.01);
+ huerotate(mat,(float)hue);
+ bright(mat,brightness*0.01);
+ for (int i = 0; i < 3; i ++)
+ for (int j = 0; j < 3; j ++)
+ for (int k = 0; k < 256; k ++)
+ lut[i][j][k] = (int)(mat[i][j] * k + 0.5);
+
+ img.detach();
+ for (int i=0;i<image.width();i++)
+ for (int j=0;j<image.height();j++)
+ {
+ c = image.pixel(i,j);
+ r = qRed(c);
+ g = qGreen(c);
+ b = qBlue(c);
+
+ v = lut[0][0][r] + lut[1][0][g] + lut[2][0][b];
+ if (gamma != 1000) v = (int)rint(pow(v,gam));
+ if (v < 0) r2 = 0;
+ else if (v > 255) r2 = 255;
+ else r2 = v;
+
+ v = lut[0][1][r] + lut[1][1][g] + lut[2][1][b];
+ if (gamma != 1000) v = (int)rint(pow(v,gam));
+ if (v < 0) g2 = 0;
+ else if (v > 255) g2 = 255;
+ else g2 = v;
+
+ v = lut[0][2][r] + lut[1][2][g] + lut[2][2][b];
+ if (gamma != 1000) v = (int)rint(pow(v,gam));
+ if (v < 0) b2 = 0;
+ else if (v > 255) b2 = 255;
+ else b2 = v;
+
+ img.setPixel(i,j,qRgb(r2,g2,b2));
+ }
+ return img;
+}
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