diff options
Diffstat (limited to 'libskrift_get_grapheme_glyph.c')
| -rw-r--r-- | libskrift_get_grapheme_glyph.c | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/libskrift_get_grapheme_glyph.c b/libskrift_get_grapheme_glyph.c new file mode 100644 index 0000000..cdaee2d --- /dev/null +++ b/libskrift_get_grapheme_glyph.c @@ -0,0 +1,133 @@ +/* See LICENSE file for copyright and license details. */ +#include "common.h" + +static const uint8_t gamma_map[] = { + 0, 13, 22, 28, 34, 38, 42, 46, 50, 53, 56, 59, 61, 64, 66, 69, + 71, 73, 75, 77, 79, 81, 83, 85, 86, 88, 90, 92, 93, 95, 96, 98, + 99, 101, 102, 104, 105, 106, 108, 109, 110, 112, 113, 114, 115, 117, 118, 119, + 120, 121, 122, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135, 136, + 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 148, 149, 150, 151, + 152, 153, 154, 155, 155, 156, 157, 158, 159, 159, 160, 161, 162, 163, 163, 164, + 165, 166, 167, 167, 168, 169, 170, 170, 171, 172, 173, 173, 174, 175, 175, 176, + 177, 178, 178, 179, 180, 180, 181, 182, 182, 183, 184, 185, 185, 186, 187, 187, + 188, 189, 189, 190, 190, 191, 192, 192, 193, 194, 194, 195, 196, 196, 197, 197, + 198, 199, 199, 200, 200, 201, 202, 202, 203, 203, 204, 205, 205, 206, 206, 207, + 208, 208, 209, 209, 210, 210, 211, 212, 212, 213, 213, 214, 214, 215, 215, 216, + 216, 217, 218, 218, 219, 219, 220, 220, 221, 221, 222, 222, 223, 223, 224, 224, + 225, 226, 226, 227, 227, 228, 228, 229, 229, 230, 230, 231, 231, 232, 232, 233, + 233, 234, 234, 235, 235, 236, 236, 237, 237, 238, 238, 238, 239, 239, 240, 240, + 241, 241, 242, 242, 243, 243, 244, 244, 245, 245, 246, 246, 246, 247, 247, 248, + 248, 249, 249, 250, 250, 251, 251, 251, 252, 252, 253, 253, 254, 254, 255, 255 +}; + +int +libskrift_get_grapheme_glyph(LIBSKRIFT_CONTEXT *ctx, libskrift_codepoint_t codepoint, + double cursor_x, double cursor_y, struct libskrift_glyph **glyphp) +{ + struct SFT_Char sft_chr; + size_t size = 1, width0, width1, width2, width3, osize, off, r, c, i; + int top = 0, left = 0, right = 0, bottom = 0; + uint16_t width, height, vmul = 1, hmul = 1; + uint8_t *image, *in_image, t; + + memset(&sft_chr, 0, sizeof(sft_chr)); + + ctx->schrift_ctx.x = cursor_x * (ctx->subpixel_horizontally ? 3 : 1); + ctx->schrift_ctx.y = cursor_y * (ctx->subpixel_vertically ? 3 : 1); + ctx->schrift_ctx.flags = SFT_DOWNWARD_Y | SFT_CHAR_IMAGE; + + if (sft_char(&ctx->schrift_ctx, codepoint, &sft_chr)) + return -1; + + if (ctx->subpixel_horizontally) { + hmul = 3; + size = 3; + left = (3 + sft_chr.x % 3) % 3; + right = (3 - (sft_chr.width + left) % 3) % 3; + } else if (ctx->subpixel_vertically) { + vmul = 3; + size = 3; + top = (3 + sft_chr.y % 3) % 3; + bottom = (3 - (sft_chr.height + top) % 3) % 3; + } + + width = (uint16_t)(sft_chr.width + left + right) / hmul; + height = (uint16_t)(sft_chr.height + top + bottom) / vmul; + size *= (size_t)width * (size_t)height; + + *glyphp = malloc(offsetof(struct libskrift_glyph, image) + size); + if (!*glyphp) { + free(sft_chr.image); + return -1; + } + + (*glyphp)->advance = sft_chr.advance / hmul; + (*glyphp)->x = (int16_t)((sft_chr.x - left) / (int16_t)hmul); + (*glyphp)->y = (int16_t)((sft_chr.y - top) / (int16_t)vmul); + (*glyphp)->width = width; + (*glyphp)->height = height; + (*glyphp)->size = size; + + image = (*glyphp)->image; + in_image = sft_chr.image; + if (ctx->subpixel_horizontally && width) { + width3 = (size_t)width * 3; + for (r = 0; r < height; r++) { + image[0] = image[width3 - 3] = 0; + image[1] = image[width3 - 2] = 0; + image[2] = image[width3 - 1] = 0; + memcpy(&image[left], in_image, (size_t)sft_chr.width); + image += width3; + in_image += sft_chr.width; + } + if (ctx->subpixel_bgr) { + image = (*glyphp)->image; + for (i = 0; i < size; i += 3) { + t = image[i + 0]; + image[i + 0] = image[i + 2]; + image[i + 2] = t; + } + } + } else if (ctx->subpixel_vertically && height) { + width0 = (size_t)width * (ctx->subpixel_bgr ? 2 : 0); + width1 = (size_t)width * 1; + width2 = (size_t)width * (ctx->subpixel_bgr ? 0 : 2); + width3 = (size_t)width * 3; + in_image = realloc(in_image, size); + if (!in_image) { + free(sft_chr.image); + free(*glyphp); + *glyphp = NULL; + return -1; + } + sft_chr.image = in_image; + osize = (size_t)sft_chr.width * (size_t)sft_chr.height; + off = (size_t)top; + if (off) { + off *= width; + memmove(&in_image[off], in_image, osize); + memset(in_image, 0, off); + osize += off; + } + memset(&in_image[osize], 0, size - osize); + for (i = r = 0; r < height; r++) { + for (c = 0; c < width; c++, i += 3) { + image[i + 0] = in_image[c + width0]; + image[i + 1] = in_image[c + width1]; + image[i + 2] = in_image[c + width2]; + } + in_image += width3; + } + } else { + memcpy(image, in_image, size); + } + + if (ctx->rendering.flags & LIBSKRIFT_CORRECT_GAMMA) { + image = (*glyphp)->image; + for (i = 0; i < size; i++) + image[i] = gamma_map[image[i]]; + } + + free(sft_chr.image); + return 0; +} |