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/* 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;
}
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