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/* See LICENSE file for copyright and license details. */
#include "common.h"
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;
struct SFT sft_ctx;
size_t size = 1, 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;
memset(&sft_chr, 0, sizeof(sft_chr));
sft_ctx = ctx->schrift_ctx;
sft_ctx.x = cursor_x * (ctx->subpixel_horizontally ? 3 : 1);
sft_ctx.y = cursor_y * (ctx->subpixel_vertically ? 3 : 1);
sft_ctx.flags = SFT_DOWNWARD_Y | SFT_CHAR_IMAGE;
if (sft_char(&sft_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;
}
} else if (ctx->subpixel_vertically && height) {
width1 = (size_t)width * 1;
width2 = (size_t)width * 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];
image[i + 1] = in_image[c + width1];
image[i + 2] = in_image[c + width2];
}
in_image += width3;
}
} else {
memcpy(image, in_image, size);
}
free(sft_chr.image);
return 0;
}
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