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/* See LICENSE file for copyright and license details. */
#include "common.h"
#define FORCED_FLAGS (LIBSKRIFT_NO_LIGATURES |\
LIBSKRIFT_NO_AUTOHINTING |\
LIBSKRIFT_NO_AUTOKERNING)
#define IMPLEMENTED_FLAGS (LIBSKRIFT_REMOVE_GAMMA |\
LIBSKRIFT_MIRROR_CHARS |\
FORCED_FLAGS) /* libschrift does not add gamma, so not handling is required */
#define TRANSFORMING_FLAGS (LIBSKRIFT_MIRROR_TEXT |\
LIBSKRIFT_MIRROR_CHARS |\
LIBSKRIFT_TRANSPOSE_TEXT |\
LIBSKRIFT_TRANSPOSE_CHARS)
#define COPY_ARRAY(DEST_STRUCT, SRC_STRUCT, FIELD)\
memcpy((DEST_STRUCT).FIELD, (SRC_STRUCT).FIELD, sizeof((SRC_STRUCT).FIELD))
static const struct libskrift_rendering default_rendering = LIBSKRIFT_DEFAULT_RENDERING;
static void
multiply_matrices(const double a[restrict 6], const double b[restrict 6], double r[restrict 6])
{
r[0] = a[0] * b[0] + a[1] * b[3];
r[1] = a[0] * b[1] + a[1] * b[4];
r[2] = a[0] * b[2] + a[1] * b[5] + a[2];
r[3] = a[3] * b[0] + a[4] * b[3];
r[4] = a[3] * b[1] + a[4] * b[4];
r[5] = a[3] * b[2] + a[4] * b[5] + a[5];
}
static int
transformation_hook(void *hook_data, double advance, double transform[6])
{
LIBSKRIFT_CONTEXT *ctx = hook_data;
double schrift[6] = {transform[0], transform[2], transform[4],
transform[1], transform[3], transform[5]};
double m1[6] = {1, 0, 0, 0, 1, 0}, m2[6] = {1, 0, 0, 0, 1, 0};
if (((ctx->rendering.flags / LIBSKRIFT_MIRROR_CHARS) ^ (ctx->rendering.flags / LIBSKRIFT_MIRROR_TEXT)) & 1)
multiply_matrices((double []){-1, 0, advance / schrift[0], 0, 1, 0}, m2, m1);
multiply_matrices(ctx->transformation, m1, m2);
multiply_matrices(schrift, m2, m1);
transform[0] = m1[0];
transform[2] = m1[1];
transform[4] = m1[2];
transform[1] = m1[3];
transform[3] = m1[4];
transform[5] = m1[5];
return 0;
}
int
libskrift_create_context(LIBSKRIFT_CONTEXT **ctxp, LIBSKRIFT_FONT **fonts, size_t nfonts, double height,
const struct libskrift_rendering *rendering, void *caching)
{
size_t i;
(void) caching;
if (!nfonts) {
errno = EINVAL;
return -1;
}
if (rendering) {
if (!rendering->grid_fineness) {
errno = EINVAL;
return -1;
}
}
*ctxp = calloc(1, offsetof(LIBSKRIFT_CONTEXT, fonts) + nfonts * sizeof(*(*ctxp)->fonts));
if (!*ctxp)
return -1;
(*ctxp)->schrift_ctx.font = fonts[0]->font;
(*ctxp)->schrift_ctx.yScale = height;
(*ctxp)->x_advancement = 1;
(*ctxp)->y_advancement = 0;
(*ctxp)->nfonts = nfonts;
for (i = 0; i < nfonts; i++) {
(*ctxp)->fonts[i] = fonts[i];
fonts[i]->refcount += 1;
}
if (rendering) {
memcpy(&(*ctxp)->rendering, rendering, sizeof(*rendering));
COPY_ARRAY((*ctxp)->rendering, default_rendering, prestroke_transformation_rotation);
COPY_ARRAY((*ctxp)->rendering, default_rendering, left_transformation);
COPY_ARRAY((*ctxp)->rendering, default_rendering, right_transformation);
COPY_ARRAY((*ctxp)->rendering, default_rendering, top_transformation);
COPY_ARRAY((*ctxp)->rendering, default_rendering, bottom_transformation);
COPY_ARRAY((*ctxp)->rendering, default_rendering, poststroke_transformation_rotation);
} else {
memcpy(&(*ctxp)->rendering, &default_rendering, sizeof(default_rendering));
}
(*ctxp)->rendering.struct_version = LIBSKRIFT_RENDERING_STRUCT_VERSION;
(*ctxp)->rendering.hinting = LIBSKRIFT_NONE;
(*ctxp)->rendering.flags &= IMPLEMENTED_FLAGS;
(*ctxp)->rendering.flags |= FORCED_FLAGS;
(*ctxp)->rendering.flags |= LIBSKRIFT_REMOVE_GAMMA; /* libschrift does not add gamma */
(*ctxp)->rendering.grid_fineness = 1;
(*ctxp)->rendering.kerning = 0;
(*ctxp)->rendering.interletter_spacing = 0;
if (!(*ctxp)->rendering.smoothing)
(*ctxp)->rendering.smoothing = LIBSKRIFT_GREYSCALE;
(*ctxp)->schrift_ctx.xScale = (*ctxp)->schrift_ctx.yScale;
(*ctxp)->schrift_ctx.xScale *= (*ctxp)->rendering.horizontal_dpi / (*ctxp)->rendering.vertical_dpi;
(*ctxp)->schrift_ctx.hook_data = (*ctxp);
if (((*ctxp)->rendering.flags & TRANSFORMING_FLAGS) ||
fpclassify((*ctxp)->rendering.char_transformation[0] - 1) != FP_ZERO ||
fpclassify((*ctxp)->rendering.char_transformation[1]) != FP_ZERO ||
fpclassify((*ctxp)->rendering.char_transformation[2]) != FP_ZERO ||
fpclassify((*ctxp)->rendering.char_transformation[3]) != FP_ZERO ||
fpclassify((*ctxp)->rendering.char_transformation[4] - 1) != FP_ZERO ||
fpclassify((*ctxp)->rendering.char_transformation[5]) != FP_ZERO ||
fpclassify((*ctxp)->rendering.text_transformation[0] - 1) != FP_ZERO ||
fpclassify((*ctxp)->rendering.text_transformation[1]) != FP_ZERO ||
fpclassify((*ctxp)->rendering.text_transformation[2]) != FP_ZERO ||
fpclassify((*ctxp)->rendering.text_transformation[3]) != FP_ZERO ||
fpclassify((*ctxp)->rendering.text_transformation[4] - 1) != FP_ZERO ||
fpclassify((*ctxp)->rendering.text_transformation[5]) != FP_ZERO) {
memcpy((*ctxp)->transformation, (*ctxp)->rendering.char_transformation, sizeof((*ctxp)->transformation));
libskrift_add_transformation((*ctxp)->transformation, (*ctxp)->rendering.text_transformation);
(*ctxp)->x_advancement = (*ctxp)->rendering.text_transformation[0];
(*ctxp)->y_advancement = (*ctxp)->rendering.text_transformation[3];
(*ctxp)->schrift_ctx.transformation_hook = transformation_hook;
}
if ((*ctxp)->rendering.smoothing == LIBSKRIFT_SUBPIXEL) {
if ((*ctxp)->rendering.subpixel_order == LIBSKRIFT_RGB) {
(*ctxp)->schrift_ctx.xScale *= 3;
(*ctxp)->subpixel_horizontally = 1;
} else if ((*ctxp)->rendering.subpixel_order == LIBSKRIFT_BGR) {
(*ctxp)->schrift_ctx.xScale *= 3;
(*ctxp)->subpixel_horizontally = 1;
(*ctxp)->subpixel_bgr = 1;
} else if ((*ctxp)->rendering.subpixel_order == LIBSKRIFT_VRGB) {
(*ctxp)->schrift_ctx.yScale *= 3;
(*ctxp)->subpixel_vertically = 1;
} else if ((*ctxp)->rendering.subpixel_order == LIBSKRIFT_VBGR) {
(*ctxp)->schrift_ctx.yScale *= 3;
(*ctxp)->subpixel_vertically = 1;
(*ctxp)->subpixel_bgr = 1;
} else {
(*ctxp)->rendering.subpixel_order = LIBSKRIFT_NONE;
(*ctxp)->rendering.smoothing = LIBSKRIFT_GREYSCALE;
}
}
return 0;
}
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