diff options
| -rw-r--r-- | libfonts_get_output_dpi.c | 328 |
1 files changed, 303 insertions, 25 deletions
diff --git a/libfonts_get_output_dpi.c b/libfonts_get_output_dpi.c index 47fcb70..03f73cc 100644 --- a/libfonts_get_output_dpi.c +++ b/libfonts_get_output_dpi.c @@ -6,7 +6,7 @@ static int invert(struct libfonts_transformation *out, const struct libfonts_transformation *in) { - double m[3][3], t; + double m[3][6], t; int i, j; #define SWAP_ROWS(A, B)\ @@ -18,6 +18,7 @@ invert(struct libfonts_transformation *out, const struct libfonts_transformation }\ } while (0) + /* Copy in-matrix and augment with identity-matrix */ for (i = 0; i < 3; i++) { for (j = 0; j < 3; j++) { m[i][j] = in->m[i][j]; @@ -26,6 +27,7 @@ invert(struct libfonts_transformation *out, const struct libfonts_transformation m[i][i + 3] = 1; } + /* Set m[0][0] ≠ 0 */ if (eq(m[0][0], 0)) { if (!eq(m[1][0], 0)) SWAP_ROWS(0, 1); @@ -34,34 +36,34 @@ invert(struct libfonts_transformation *out, const struct libfonts_transformation 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]; + /* Set m[0][0] = 1 */ for (t = m[0][0], i = 0; i < 6; i++) m[0][i] /= t; + /* Set m[1][0] = 0 */ for (t = m[1][0], i = 0; i < 6; i++) m[1][i] -= t * m[0][i]; + /* Set m[2][0] = 0 */ for (t = m[2][0], i = 0; i < 6; i++) m[2][i] -= t * m[0][i]; + /* Set m[1][1] ≠ 0 */ 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]; + /* Set m[1][1] = 1 */ for (t = m[1][1], i = 1; i < 6; i++) m[1][i] /= t; + /* Set m[2][1] = 0 */ for (t = m[2][1], i = 1; i < 6; i++) m[2][i] -= t * m[1][i]; + /* Set m[0][1] = 0 */ for (t = m[0][1], i = 1; i < 6; i++) m[0][i] -= t * m[1][i]; + /* Set m[2][2] ≠ 0 */ 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]; + /* Set m[2][2] = 1 */ for (t = m[2][2], i = 2; i < 6; i++) m[2][i] /= t; + /* Set m[1][2] = 0 */ for (t = m[1][2], i = 2; i < 6; i++) m[1][i] -= t * m[2][i]; + /* Set m[0][2] = 0 */ for (t = m[0][2], i = 2; i < 6; i++) m[0][i] -= t * m[2][i]; + + /* Output augment */ + for (i = 0; i < 3; i++) { + out->m[i][0] = m[i][3]; + out->m[i][1] = m[i][4]; + out->m[i][2] = m[i][5]; + } return 1; } @@ -73,13 +75,13 @@ 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]; + double x[4], y[4], c1, c2, c3, c4; 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) + if (strncasecmp(edid, "00""FF""FF""FF""FF""FF""FF""00", 8 * 2) || strlen(edid) < 256) return 0; width1 = edid[21 * 2 + 0]; @@ -109,10 +111,25 @@ libfonts_get_output_dpi(struct libfonts_output *output, const char *edid) } transform(&x[0], &y[0], 0, 0, &invtrans); - transform(&x[1], &y[1], output->dpi_x, output->dpi_y, &invtrans); + transform(&x[1], &y[1], output->dpi_x, 0, &invtrans); + transform(&x[2], &y[2], 0, output->dpi_y, &invtrans); + transform(&x[3], &y[3], output->dpi_x, output->dpi_y, &invtrans); + + c1 = x[0] > x[1] ? x[0] - x[1] : x[1] - x[0]; + c2 = x[0] > x[2] ? x[0] - x[2] : x[2] - x[0]; + c3 = x[3] > x[1] ? x[3] - x[1] : x[1] - x[3]; + c4 = x[3] > x[2] ? x[3] - x[2] : x[2] - x[3]; + c1 = c1 > c2 ? c1 : c2; + c3 = c3 > c4 ? c3 : c4; + output->dpi_x = c1 > c3 ? c1 : c3; - 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]; + c1 = y[0] > y[1] ? y[0] - y[1] : y[1] - y[0]; + c2 = y[0] > y[2] ? y[0] - y[2] : y[2] - y[0]; + c3 = y[3] > y[1] ? y[3] - y[1] : y[1] - y[3]; + c4 = y[3] > y[2] ? y[3] - y[2] : y[2] - y[3]; + c1 = c1 > c2 ? c1 : c2; + c3 = c3 > c4 ? c3 : c4; + output->dpi_y = c1 > c3 ? c1 : c3; return 1; } @@ -122,8 +139,269 @@ libfonts_get_output_dpi(struct libfonts_output *output, const char *edid) int -main(void) /* TODO add test */ +main(void) { +#define T_(MAT, XOUT, YOUT, RET)\ + do {\ + output.dpi_x = 100;\ + output.dpi_y = 150;\ + memcpy(&output.output_transformation, &MAT, sizeof(struct libfonts_transformation));\ + ASSERT(libfonts_get_output_dpi(&output, NULL) == RET);\ + ASSERT(eq(output.dpi_x, XOUT));\ + ASSERT(eq(output.dpi_y, YOUT));\ + } while (0) + +#define T(MAT, XOUT, YOUT) T_(MAT, XOUT, YOUT, 1) +#define ASIS(MAT) T(MAT, 100, 150) +#define SWAPS(MAT) T(MAT, 150, 100) + + char edid[512]; + struct libfonts_output output; + struct libfonts_transformation asis_matrix = {.m = { + {+1, 0, 0}, + { 0, +1, 0}, + { 0, 0, 1}}}; + struct libfonts_transformation rot90cw_matrix = {.m = { + { 0, -1, 0}, + {+1, 0, 0}, + { 0, 0, 1}}}; + struct libfonts_transformation rot180cw_matrix = {.m = { + {-1, 0, 0}, + { 0, -1, 0}, + { 0, 0, 1}}}; + struct libfonts_transformation rot270cw_matrix = {.m = { + { 0, +1, 0}, + {-1, 0, 0}, + { 0, 0, 1}}}; + struct libfonts_transformation flip_matrix = {.m = { + {+1, 0, 0}, + { 0, -1, 0}, + { 0, 0, 1}}}; + struct libfonts_transformation flop_matrix = {.m = { + {-1, 0, 0}, + { 0, +1, 0}, + { 0, 0, 1}}}; + struct libfonts_transformation transpose_matrix = {.m = { + { 0, +1, 0}, + {+1, 0, 0}, + { 0, 0, 1}}}; + struct libfonts_transformation antitranspose_matrix = {.m = { + { 0, -1, 0}, + {-1, 0, 0}, + { 0, 0, 1}}}; + struct libfonts_transformation xdouble_matrix = {.m = { + {+2, 0, 0}, + { 0, +1, 0}, + { 0, 0, 1}}}; + struct libfonts_transformation ydouble_matrix = {.m = { + {+1, 0, 0}, + { 0, +2, 0}, + { 0, 0, 1}}}; + struct libfonts_transformation xydouble_matrix = {.m = { + {+2, 0, 0}, + { 0, +2, 0}, + { 0, 0, 1}}}; + struct libfonts_transformation xtranslate_matrix = {.m = { + {+1, 0, 1}, + { 0, +1, 0}, + { 0, 0, 1}}}; + struct libfonts_transformation ytranslate_matrix = {.m = { + {+1, 0, 0}, + { 0, +1, 1}, + { 0, 0, 1}}}; + struct libfonts_transformation xytranslate_matrix = {.m = { + {+1, 0, 1}, + { 0, +1, 1}, + { 0, 0, 1}}}; + struct libfonts_transformation xshear_matrix = {.m = { + {+1, +1, 0}, + { 0, +1, 0}, + { 0, 0, 1}}}; + struct libfonts_transformation yshear_matrix = {.m = { + {+1, 0, 0}, + {+1, +1, 0}, + { 0, 0, 1}}}; + struct libfonts_transformation rot45cw_matrix = {.m = { + {+0.7071067811865475, -0.7071067811865475, 0}, + {+0.7071067811865475, +0.7071067811865475, 0}, + { 0, 0, 1}}}; + struct libfonts_transformation uninvertable_matrix = {.m = { + {1, 1, 0}, + {1, 1, 0}, + {0, 0, 1}}}; + struct libfonts_transformation null_matrix = {.m = { + {0, 0, 0}, + {0, 0, 0}, + {0, 0, 0}}}; + + ASIS(asis_matrix); + ASIS(rot180cw_matrix); + ASIS(flip_matrix); + ASIS(flop_matrix); + ASIS(xtranslate_matrix); + ASIS(ytranslate_matrix); + ASIS(xytranslate_matrix); + + SWAPS(rot90cw_matrix); + SWAPS(rot270cw_matrix); + SWAPS(transpose_matrix); + SWAPS(antitranspose_matrix); + + T(xdouble_matrix, 50, 150); + T(ydouble_matrix, 100, 75); + T(xydouble_matrix, 50, 75); + + T(xshear_matrix, 150, 150); /* not important */ + T(yshear_matrix, 100, 150); /* not important */ + + T(rot45cw_matrix, 150 * 0.7071067811865475, 150 * 0.7071067811865475); /* not important */ + + T_(uninvertable_matrix, 0, 0, 0); + T_(null_matrix, 0, 0, 0); + + output.unrotated_output_width = 400; + output.unrotated_output_height = 500; + + output.dpi_x = 100; + output.dpi_y = 150; + strcpy(edid, "00""FF""FF""FF""FF""FF""FF""00"); + memcpy(&output.output_transformation, &asis_matrix, sizeof(struct libfonts_transformation)); + ASSERT(libfonts_get_output_dpi(&output, edid) == 0); + ASSERT(eq(output.dpi_x, 0)); + ASSERT(eq(output.dpi_y, 0)); + + output.dpi_x = 100; + output.dpi_y = 150; + memset(edid, '0', sizeof(edid)); + memcpy(edid, "00""FF""FF""FF""FF""FF""FF""00", 8 * 2); + edid[21 * 2 + 0] = 'A'; + edid[21 * 2 + 1] = 'A'; + edid[22 * 2 + 0] = 'A'; + edid[22 * 2 + 1] = 'A'; + edid[255] = '\0'; + memcpy(&output.output_transformation, &asis_matrix, sizeof(struct libfonts_transformation)); + ASSERT(libfonts_get_output_dpi(&output, edid) == 0); + ASSERT(eq(output.dpi_x, 0)); + ASSERT(eq(output.dpi_y, 0)); + + output.dpi_x = 100; + output.dpi_y = 150; + memset(edid, '0', sizeof(edid)); + memcpy(edid, "00""FF""FF""FF""FF""FF""FF""00", 8 * 2); + edid[21 * 2 + 0] = 'A'; + edid[21 * 2 + 1] = 'A'; + edid[22 * 2 + 0] = 'A'; + edid[22 * 2 + 1] = 'A'; + edid[254] = '\0'; + memcpy(&output.output_transformation, &asis_matrix, sizeof(struct libfonts_transformation)); + ASSERT(libfonts_get_output_dpi(&output, edid) == 0); + ASSERT(eq(output.dpi_x, 0)); + ASSERT(eq(output.dpi_y, 0)); + + output.dpi_x = 100; + output.dpi_y = 150; + memset(edid, '0', sizeof(edid)); + memcpy(edid, "00""FF""FF""FF""FF""FF""FF""00", 8 * 2); + edid[21 * 2 + 0] = 'X'; + edid[21 * 2 + 1] = 'X'; + edid[22 * 2 + 0] = 'X'; + edid[22 * 2 + 1] = 'X'; + edid[256] = '\0'; + memcpy(&output.output_transformation, &asis_matrix, sizeof(struct libfonts_transformation)); + ASSERT(libfonts_get_output_dpi(&output, edid) == 0); + ASSERT(eq(output.dpi_x, 0)); + ASSERT(eq(output.dpi_y, 0)); + + output.dpi_x = 100; + output.dpi_y = 150; + memset(edid, '0', sizeof(edid)); + memcpy(edid, "00""FF""FF""FF""FF""FF""FF""00", 8 * 2); + edid[21 * 2 + 0] = 'A'; + edid[21 * 2 + 1] = 'A'; + edid[22 * 2 + 0] = '0'; + edid[22 * 2 + 1] = '0'; + edid[256] = '\0'; + memcpy(&output.output_transformation, &asis_matrix, sizeof(struct libfonts_transformation)); + ASSERT(libfonts_get_output_dpi(&output, edid) == 0); + ASSERT(eq(output.dpi_x, 0)); + ASSERT(eq(output.dpi_y, 0)); + + output.dpi_x = 100; + output.dpi_y = 150; + memset(edid, '0', sizeof(edid)); + memcpy(edid, "00""FF""FF""FF""FF""FF""FF""00", 8 * 2); + edid[21 * 2 + 0] = '0'; + edid[21 * 2 + 1] = '0'; + edid[22 * 2 + 0] = 'A'; + edid[22 * 2 + 1] = 'A'; + edid[256] = '\0'; + memcpy(&output.output_transformation, &asis_matrix, sizeof(struct libfonts_transformation)); + ASSERT(libfonts_get_output_dpi(&output, edid) == 0); + ASSERT(eq(output.dpi_x, 0)); + ASSERT(eq(output.dpi_y, 0)); + + output.dpi_x = 100; + output.dpi_y = 150; + memset(edid, '0', sizeof(edid)); + memcpy(edid, "00""FF""FF""FF""FF""FF""FF""00", 8 * 2); + edid[21 * 2 + 0] = '0'; + edid[21 * 2 + 1] = '0'; + edid[22 * 2 + 0] = '0'; + edid[22 * 2 + 1] = '0'; + edid[256] = '\0'; + memcpy(&output.output_transformation, &asis_matrix, sizeof(struct libfonts_transformation)); + ASSERT(libfonts_get_output_dpi(&output, edid) == 0); + ASSERT(eq(output.dpi_x, 0)); + ASSERT(eq(output.dpi_y, 0)); + + output.unrotated_output_width = 400; + output.unrotated_output_height = 500; + output.dpi_x = 100; + output.dpi_y = 150; + memset(edid, '0', sizeof(edid)); + memcpy(edid, "00""FF""FF""FF""FF""FF""FF""00", 8 * 2); + edid[21 * 2 + 0] = 'A'; + edid[21 * 2 + 1] = 'A'; + edid[22 * 2 + 0] = 'A'; + edid[22 * 2 + 1] = 'A'; + edid[256] = '\0'; + memcpy(&output.output_transformation, &asis_matrix, sizeof(struct libfonts_transformation)); + ASSERT(libfonts_get_output_dpi(&output, edid) == 1); + ASSERT(eq(output.dpi_x, 2.54 * 400 / 0xAA)); + ASSERT(eq(output.dpi_y, 2.54 * 500 / 0xAA)); + + output.unrotated_output_width = 400; + output.unrotated_output_height = 500; + output.dpi_x = 100; + output.dpi_y = 150; + memset(edid, '0', sizeof(edid)); + memcpy(edid, "00""FF""FF""FF""FF""FF""FF""00", 8 * 2); + edid[21 * 2 + 0] = '9'; + edid[21 * 2 + 1] = '9'; + edid[22 * 2 + 0] = '8'; + edid[22 * 2 + 1] = '8'; + edid[256] = '\0'; + memcpy(&output.output_transformation, &asis_matrix, sizeof(struct libfonts_transformation)); + ASSERT(libfonts_get_output_dpi(&output, edid) == 1); + ASSERT(eq(output.dpi_x, 2.54 * 400 / 0x99)); + ASSERT(eq(output.dpi_y, 2.54 * 500 / 0x88)); + + output.unrotated_output_width = 400; + output.unrotated_output_height = 500; + output.dpi_x = 100; + output.dpi_y = 150; + memset(edid, '0', sizeof(edid)); + memcpy(edid, "00""FF""FF""FF""FF""FF""FF""00", 8 * 2); + edid[21 * 2 + 0] = '9'; + edid[21 * 2 + 1] = '9'; + edid[22 * 2 + 0] = '8'; + edid[22 * 2 + 1] = '8'; + edid[256] = '\0'; + memcpy(&output.output_transformation, &rot90cw_matrix, sizeof(struct libfonts_transformation)); + ASSERT(libfonts_get_output_dpi(&output, edid) == 1); + ASSERT(eq(output.dpi_y, 2.54 * 400 / 0x99)); + ASSERT(eq(output.dpi_x, 2.54 * 500 / 0x88)); + return 0; } |