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/* See LICENSE file for copyright and license details. */
#include "common.h"
static int
invert(struct libfonts_transformation *out, const struct libfonts_transformation *in)
{
double m[3][3], t;
int i, j;
#define SWAP_ROWS(A, B)\
do {\
for (i = 0; i < 6; i++) {\
t = m[A][i];\
m[A][i] = m[B][i];\
m[B][i] = t;\
}\
} while (0)
for (i = 0; i < 3; i++) {
for (j = 0; j < 3; j++) {
m[i][j] = in->m[i][j];
m[i][j + 3] = 0;
}
m[i][i + 3] = 1;
}
if (eq(m[0][0], 0)) {
if (!eq(m[1][0], 0))
SWAP_ROWS(0, 1);
else if (!eq(m[2][0], 0))
SWAP_ROWS(0, 2);
else
return 0;
}
for (i = 0; i < 6; i++)
m[0][i] /= m[0][0];
for (i = 0; i < 6; i++)
m[1][i] -= m[1][0] * m[0][i];
for (i = 0; i < 6; i++)
m[2][i] -= m[2][0] * m[0][i];
if (eq(m[1][1], 0)) {
if (!eq(m[2][1], 0))
SWAP_ROWS(1, 2);
else
return 0;
}
for (i = 1; i < 6; i++)
m[1][i] /= m[1][1];
for (i = 1; i < 6; i++)
m[2][i] -= m[2][1] * m[1][i];
for (i = 1; i < 6; i++)
m[0][i] -= m[0][1] * m[1][i];
if (eq(m[2][2], 0))
return 0;
for (i = 2; i < 6; i++)
m[2][i] /= m[2][2];
for (i = 2; i < 6; i++)
m[1][i] -= m[1][1] * m[2][i];
for (i = 2; i < 6; i++)
m[0][i] -= m[0][1] * m[2][i];
return 1;
}
int
libfonts_get_output_dpi(struct libfonts_output *output, const char *edid)
{
struct libfonts_transformation invtrans;
int width, height;
char width1, width2, height1, height2;
double x[2], y[2];
if (edid) {
output->dpi_x = 0;
output->dpi_y = 0;
if (strncasecmp(edid, "00""FF""FF""FF""FF""FF""FF""00", 2 * 8) || strlen(edid) < 256)
return 0;
width1 = edid[21 * 2 + 0];
width2 = edid[21 * 2 + 1];
height1 = edid[22 * 2 + 0];
height2 = edid[22 * 2 + 1];
if (!isxdigit(width1) || !isxdigit(width2) || !isxdigit(height1) || !isxdigit(height2))
return 0;
width = ((width1 & 15) + (width1 > '9' ? 9 : 0)) << 4;
width |= (width2 & 15) + (width2 > '9' ? 9 : 0);
height = ((height1 & 15) + (height1 > '9' ? 9 : 0)) << 4;
height |= (height2 & 15) + (height2 > '9' ? 9 : 0);
if (!width || !height)
return 0;
output->dpi_x = (double)output->unrotated_output_width / (double)width * 2.54;
output->dpi_y = (double)output->unrotated_output_height / (double)height * 2.54;
}
if (!invert(&invtrans, &output->output_transformation)) {
output->dpi_x = 0;
output->dpi_y = 0;
return 0;
}
transform(&x[0], &y[0], 0, 0, &invtrans);
transform(&x[1], &y[1], output->dpi_x, output->dpi_y, &invtrans);
output->dpi_x = x[1] > x[0] ? x[1] - x[0] : x[0] - x[1];
output->dpi_y = y[1] > y[0] ? y[1] - y[0] : y[0] - y[1];
return 1;
}
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