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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 |\
FORCED_FLAGS) /* libschrift does not add gamma, so not handling is required */
#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 int
transformation_hook(void *hook_data, double advance, double transform[6])
{
LIBSKRIFT_CONTEXT *ctx = hook_data;
double r1c1b = ctx->rendering.char_transformation[0], r1c1a = transform[0];
double r1c2b = ctx->rendering.char_transformation[1], r1c2a = transform[2];
double r1c3b = ctx->rendering.char_transformation[2], r1c3a = transform[4];
double r2c1b = ctx->rendering.char_transformation[3], r2c1a = transform[1];
double r2c2b = ctx->rendering.char_transformation[4], r2c2a = transform[3];
double r2c3b = ctx->rendering.char_transformation[5], r2c3a = transform[5];
transform[0] = r1c1a * r1c1b + r1c2a * r2c1b;
transform[2] = r1c1a * r1c2b + r1c2a * r2c2b;
transform[4] = r1c1a * r1c3b + r1c2a * r2c3b + r1c3a;
transform[1] = r2c1a * r1c1b + r2c2a * r2c1b;
transform[3] = r2c1a * r1c2b + r2c2a * r2c2b;
transform[5] = r2c1a * r1c3b + r2c2a * r2c3b + r2c3a;
(void) advance;
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)->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);
COPY_ARRAY((*ctxp)->rendering, default_rendering, text_transformation);
} 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.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 (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)
(*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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