1260 lines
35 KiB
C
1260 lines
35 KiB
C
/**
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* @brief Toaru Text library - TrueType parser.
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* @file lib/text.c
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* @author K. Lange <klange@toaruos.org>
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*
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* Implementation of TrueType font file parsing and basic
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* glyph rendering.
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*
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* @copyright
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* This file is part of ToaruOS and is released under the terms
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* of the NCSA / University of Illinois License - see LICENSE.md
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* Copyright (C) 2021 K. Lange
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*/
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#include <stdio.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/shm.h>
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#include <math.h>
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#include <toaru/graphics.h>
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#include <toaru/hashmap.h>
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#include <toaru/decodeutf8.h>
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#include <toaru/spinlock.h>
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#undef min
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#define min(a,b) ((a) < (b) ? (a) : (b))
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struct TT_Table {
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off_t offset;
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size_t length;
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};
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struct TT_Coord {
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float x;
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float y;
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};
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struct TT_Edge {
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struct TT_Coord start;
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struct TT_Coord end;
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int direction;
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};
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struct TT_Contour {
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size_t edgeCount;
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size_t nextAlloc;
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size_t flags;
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size_t last_start;
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struct TT_Edge edges[];
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};
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struct TT_Intersection {
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float x;
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int affect;
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};
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struct TT_Shape {
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size_t edgeCount;
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int lastY;
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int startY;
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int lastX;
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int startX;
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struct TT_Edge edges[];
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};
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struct TT_Vertex {
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unsigned char flags;
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int x;
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int y;
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};
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struct TT_Font {
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int privFlags;
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FILE * filePtr;
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uint8_t * buffer;
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uint8_t * memPtr;
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struct TT_Table head_ptr;
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struct TT_Table cmap_ptr;
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struct TT_Table loca_ptr;
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struct TT_Table glyf_ptr;
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struct TT_Table hhea_ptr;
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struct TT_Table hmtx_ptr;
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struct TT_Table name_ptr;
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struct TT_Table os_2_ptr;
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off_t cmap_start;
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size_t cmap_maxInd;
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float scale;
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float emSize;
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int cmap_type;
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int loca_type;
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};
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struct TT_FontMetrics {
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float ascender;
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float descender;
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float lineGap;
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};
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/* Currently, the edge sorter is disabled. It doesn't really help much,
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* and it's very slow with our horrible qsort implementation. */
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#if 0
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static int edge_sorter_high_scanline(const void * a, const void * b) {
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const struct TT_Edge * left = a;
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const struct TT_Edge * right = b;
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if (left->start.y < right->start.y) return -1;
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if (left->start.y > right->start.y) return 1;
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return 0;
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}
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static void sort_edges(size_t edgeCount, struct TT_Edge edges[edgeCount]) {
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qsort(edges, edgeCount, sizeof(struct TT_Edge), edge_sorter_high_scanline);
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}
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#endif
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static int intersection_sorter(const void * a, const void * b) {
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const struct TT_Intersection * left = a;
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const struct TT_Intersection * right = b;
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if (left->x < right->x) return -1;
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if (left->x > right->x) return 1;
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return 0;
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}
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static inline void sort_intersections(size_t cnt, struct TT_Intersection intersections[cnt]) {
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qsort(intersections, cnt, sizeof(struct TT_Intersection), intersection_sorter);
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}
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static inline float edge_at(float y, const struct TT_Edge * edge) {
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float u = (y - edge->start.y) / (edge->end.y - edge->start.y);
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return edge->start.x + u * (edge->end.x - edge->start.x);
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}
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__attribute__((hot))
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static inline size_t prune_edges(size_t edgeCount, float y, const struct TT_Edge edges[edgeCount], struct TT_Intersection into[edgeCount]) {
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size_t outWriter = 0;
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for (size_t i = 0; i < edgeCount; ++i) {
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if (y > edges[i].end.y || y <= edges[i].start.y) continue;
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into[outWriter].x = edge_at(y,&edges[i]);
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into[outWriter].affect = edges[i].direction;
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outWriter++;
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}
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return outWriter;
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}
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static void process_scanline(
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float _y,
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const struct TT_Shape * shape,
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size_t subsample_width,
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float subsamples[subsample_width],
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size_t cnt,
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const struct TT_Intersection crosses[cnt]
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) {
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int wind = 0;
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size_t j = 0;
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for (int x = shape->startX; x < shape->lastX && j < cnt; ++x) {
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while (j < cnt && x > crosses[j].x) {
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wind += crosses[j].affect;
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j++;
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}
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float last = x;
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while (j < cnt && (x+1) > crosses[j].x) {
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if (wind != 0) {
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subsamples[x - shape->startX] += crosses[j].x - last;
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}
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last = crosses[j].x;
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wind += crosses[j].affect;
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j++;
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}
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if (wind != 0) {
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subsamples[x - shape->startX] += (x+1) - last;
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}
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}
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}
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static inline uint32_t tt_rgba(uint8_t r, uint8_t g, uint8_t b, uint8_t a) {
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return (a << 24U) | (r << 16) | (g << 8) | (b);
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}
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static inline uint32_t tt_apply_alpha(uint32_t color, uint16_t alpha) {
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uint8_t r = ((uint32_t)(_RED(color) * alpha + 0x80) * 0x101) >> 16UL;
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uint8_t g = ((uint32_t)(_GRE(color) * alpha + 0x80) * 0x101) >> 16UL;
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uint8_t b = ((uint32_t)(_BLU(color) * alpha + 0x80) * 0x101) >> 16UL;
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uint8_t a = ((uint32_t)(_ALP(color) * alpha + 0x80) * 0x101) >> 16UL;
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return tt_rgba(r,g,b,a);
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}
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static inline uint32_t tt_alpha_blend_rgba(uint32_t bottom, uint32_t top) {
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if (_ALP(bottom) == 0) return top;
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if (_ALP(top) == 255) return top;
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if (_ALP(top) == 0) return bottom;
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uint8_t a = _ALP(top);
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uint16_t t = 0xFF ^ a;
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uint8_t d_r = _RED(top) + (((uint32_t)(_RED(bottom) * t + 0x80) * 0x101) >> 16UL);
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uint8_t d_g = _GRE(top) + (((uint32_t)(_GRE(bottom) * t + 0x80) * 0x101) >> 16UL);
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uint8_t d_b = _BLU(top) + (((uint32_t)(_BLU(bottom) * t + 0x80) * 0x101) >> 16UL);
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uint8_t d_a = _ALP(top) + (((uint32_t)(_ALP(bottom) * t + 0x80) * 0x101) >> 16UL);
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return tt_rgba(d_r, d_g, d_b, d_a);
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}
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static void paint_scanline(gfx_context_t * ctx, int y, const struct TT_Shape * shape, float * subsamples, uint32_t color) {
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for (int x = shape->startX < 0 ? 0 : shape->startX; x < shape->lastX && x < ctx->width; ++x) {
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uint16_t na = (int)(255 * subsamples[x - shape->startX]) >> 2;
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uint32_t nc = tt_apply_alpha(color, na);
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GFX(ctx, x, y) = tt_alpha_blend_rgba(GFX(ctx, x, y), nc);
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subsamples[x-shape->startX] = 0;
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}
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}
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void tt_path_paint(gfx_context_t * ctx, const struct TT_Shape * shape, uint32_t color) {
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size_t size = shape->edgeCount;
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struct TT_Intersection * crosses = malloc(sizeof(struct TT_Intersection) * size);
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size_t subsample_width = shape->lastX - shape->startX;
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float * subsamples = malloc(sizeof(float) * subsample_width);
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memset(subsamples, 0, sizeof(float) * subsample_width);
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int startY = shape->startY < 0 ? 0 : shape->startY;
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int endY = shape->lastY <= ctx->height ? shape->lastY : ctx->height;
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for (int y = startY; y < endY; ++y) {
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float _y = y + 0.0001;
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for (int l = 0; l < 4; ++l) {
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size_t cnt;
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if ((cnt = prune_edges(size, _y, shape->edges, crosses))) {
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sort_intersections(cnt, crosses);
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process_scanline(_y, shape, subsample_width, subsamples, cnt, crosses);
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}
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_y += 1.0/4.0;
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}
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paint_scanline(ctx, y, shape, subsamples, color);
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}
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free(subsamples);
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free(crosses);
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}
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struct TT_Contour * tt_contour_line_to(struct TT_Contour * shape, float x, float y) {
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if (shape->flags & 1) {
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shape->edges[shape->edgeCount].end.x = x;
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shape->edges[shape->edgeCount].end.y = y;
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shape->edgeCount++;
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shape->flags &= ~1;
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} else {
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if (shape->edgeCount + 1 == shape->nextAlloc) {
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shape->nextAlloc *= 2;
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shape = realloc(shape, sizeof(struct TT_Contour) + sizeof(struct TT_Edge) * (shape->nextAlloc));
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}
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shape->edges[shape->edgeCount].start.x = shape->edges[shape->edgeCount-1].end.x;
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shape->edges[shape->edgeCount].start.y = shape->edges[shape->edgeCount-1].end.y;
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shape->edges[shape->edgeCount].end.x = x;
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shape->edges[shape->edgeCount].end.y = y;
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shape->edgeCount++;
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shape->flags &= ~1;
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}
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return shape;
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}
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struct TT_Contour * tt_contour_move_to(struct TT_Contour * shape, float x, float y) {
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if (!(shape->flags & 1) && shape->edgeCount) {
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shape = tt_contour_line_to(shape, shape->edges[shape->last_start].start.x, shape->edges[shape->last_start].start.y);
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}
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if (shape->edgeCount + 1 == shape->nextAlloc) {
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shape->nextAlloc *= 2;
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shape = realloc(shape, sizeof(struct TT_Contour) + sizeof(struct TT_Edge) * (shape->nextAlloc));
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}
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shape->edges[shape->edgeCount].start.x = x;
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shape->edges[shape->edgeCount].start.y = y;
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shape->last_start = shape->edgeCount;
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shape->flags |= 1;
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return shape;
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}
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struct TT_Contour * tt_contour_start(float x, float y) {
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struct TT_Contour * shape = malloc(sizeof(struct TT_Contour) + sizeof(struct TT_Edge) * 2);
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shape->edgeCount = 0;
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shape->nextAlloc = 2;
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shape->flags = 0;
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shape->last_start = 0;
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shape->edges[shape->edgeCount].start.x = x;
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shape->edges[shape->edgeCount].start.y = y;
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shape->last_start = shape->edgeCount;
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shape->flags |= 1;
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return shape;
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}
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struct TT_Shape * tt_contour_finish(struct TT_Contour * in) {
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size_t size = in->edgeCount + 1;
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struct TT_Shape * tmp = malloc(sizeof(struct TT_Shape) + sizeof(struct TT_Edge) * size);
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memcpy(tmp->edges, in->edges, sizeof(struct TT_Edge) * in->edgeCount);
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if (in->flags & 1) {
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size--;
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} else {
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tmp->edges[in->edgeCount].start.x = in->edges[in->edgeCount-1].end.x;
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tmp->edges[in->edgeCount].start.y = in->edges[in->edgeCount-1].end.y;
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tmp->edges[in->edgeCount].end.x = in->edges[in->last_start].start.x;
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tmp->edges[in->edgeCount].end.y = in->edges[in->last_start].start.y;
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}
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for (size_t i = 0; i < size; ++i) {
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if (tmp->edges[i].start.y < tmp->edges[i].end.y) {
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tmp->edges[i].direction = 1;
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} else {
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tmp->edges[i].direction = -1;
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struct TT_Coord j = tmp->edges[i].start;
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tmp->edges[i].start = tmp->edges[i].end;
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tmp->edges[i].end = j;
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}
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}
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//sort_edges(size, tmp->edges);
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tmp->edgeCount = size;
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tmp->startY = INT_MAX;
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tmp->lastY = INT_MIN;
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tmp->startX = INT_MAX;
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tmp->lastX = INT_MIN;
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for (size_t i = 0; i < size; ++i) {
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if (tmp->edges[i].end.y + 1 > tmp->lastY) tmp->lastY = tmp->edges[i].end.y + 1;
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if (tmp->edges[i].start.y + 1 > tmp->lastY) tmp->lastY = tmp->edges[i].start.y + 1;
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if (tmp->edges[i].end.y < tmp->startY) tmp->startY = tmp->edges[i].end.y;
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if (tmp->edges[i].start.y < tmp->startY) tmp->startY = tmp->edges[i].start.y;
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if (tmp->edges[i].end.x + 2 > tmp->lastX) tmp->lastX = tmp->edges[i].end.x + 2;
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if (tmp->edges[i].start.x + 2 > tmp->lastX) tmp->lastX = tmp->edges[i].start.x + 2;
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if (tmp->edges[i].end.x < tmp->startX) tmp->startX = tmp->edges[i].end.x;
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if (tmp->edges[i].start.x < tmp->startX) tmp->startX = tmp->edges[i].start.x;
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}
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if (tmp->lastY < tmp->startY) tmp->startY = tmp->lastY;
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if (tmp->lastX < tmp->startX) tmp->startX = tmp->lastX;
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return tmp;
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}
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static inline int tt_seek(struct TT_Font * font, off_t offset) {
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if (font->privFlags & 1) {
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return fseek(font->filePtr, offset, SEEK_SET);
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} else {
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font->memPtr = font->buffer + offset;
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return 0;
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}
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}
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static inline long tt_tell(struct TT_Font * font) {
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if (font->privFlags & 1) {
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return ftell(font->filePtr);
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} else {
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return font->memPtr - font->buffer;
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}
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}
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static inline uint8_t tt_read_8(struct TT_Font * font) {
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if (font->privFlags & 1) {
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return fgetc(font->filePtr);
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} else {
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return *(font->memPtr++);
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}
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}
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static inline uint32_t tt_read_32(struct TT_Font * font) {
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int a = tt_read_8(font);
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int b = tt_read_8(font);
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int c = tt_read_8(font);
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int d = tt_read_8(font);
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if (a < 0 || b < 0 || c < 0 || d < 0) return 0;
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return ((a & 0xFF) << 24) |
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((b & 0xFF) << 16) |
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((c & 0xFF) << 8) |
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((d & 0xFF) << 0);
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}
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static inline uint16_t tt_read_16(struct TT_Font * font) {
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int a = tt_read_8(font);
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int b = tt_read_8(font);
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if (a < 0 || b < 0) return 0;
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return ((a & 0xFF) << 8) |
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((b & 0xFF) << 0);
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}
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int tt_measure_font(struct TT_Font * font, struct TT_FontMetrics * metrics) {
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int a, d, l;
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if (font->os_2_ptr.offset) {
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tt_seek(font, font->os_2_ptr.offset + 2 * 37);
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a = (int16_t)tt_read_16(font);
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d = -(int16_t)tt_read_16(font);
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tt_seek(font, font->hhea_ptr.offset + 2 * 4);
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l = (int16_t)tt_read_16(font);
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} else {
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tt_seek(font, font->hhea_ptr.offset + 2 * 2);
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a = (int16_t)tt_read_16(font);
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d = (int16_t)tt_read_16(font);
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l = (int16_t)tt_read_16(font);
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}
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metrics->ascender = a * font->scale;
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metrics->descender = d * font->scale;
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metrics->lineGap = l * font->scale;
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return 0;
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}
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int tt_xadvance_for_glyph(struct TT_Font * font, unsigned int ind) {
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tt_seek(font, font->hhea_ptr.offset + 2 * 17);
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uint16_t numLong = tt_read_16(font);
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if (ind < numLong) {
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tt_seek(font, font->hmtx_ptr.offset + ind * 4);
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return tt_read_16(font);
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}
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tt_seek(font, font->hmtx_ptr.offset + (numLong - 1) * 4);
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return tt_read_16(font);
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}
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void tt_set_size(struct TT_Font * font, float size) {
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font->scale = size / font->emSize;
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}
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void tt_set_size_px(struct TT_Font * font, float size) {
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tt_set_size(font, size * 4.0 / 3.0);
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}
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off_t tt_get_glyph_offset(struct TT_Font * font, unsigned int glyph) {
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if (font->loca_type == 0) {
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tt_seek(font, font->loca_ptr.offset + glyph * 2);
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return tt_read_16(font) * 2;
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} else {
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tt_seek(font, font->loca_ptr.offset + glyph * 4);
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return tt_read_32(font);
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}
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}
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int tt_glyph_for_codepoint(struct TT_Font * font, unsigned int codepoint) {
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if (font->cmap_type == 12) {
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/* Get group count */
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tt_seek(font, font->cmap_start + 4 + 8);
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uint32_t ngroups = tt_read_32(font);
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for (unsigned int i = 0; i < ngroups; ++i) {
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uint32_t start = tt_read_32(font);
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uint32_t end = tt_read_32(font);
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uint32_t ind = tt_read_32(font);
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if (codepoint >= start && codepoint <= end) {
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return ind + (codepoint - start);
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}
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}
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} else if (font->cmap_type == 4) {
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if (codepoint > 0xFFFF) return 0;
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tt_seek(font, font->cmap_start + 6);
|
|
uint16_t segCount = tt_read_16(font) / 2;
|
|
|
|
for (int i = 0; i < segCount; ++i) {
|
|
tt_seek(font, font->cmap_start + 12 + 2 * i);
|
|
uint16_t endCode = tt_read_16(font);
|
|
if (endCode >= codepoint) {
|
|
tt_seek(font, font->cmap_start + 12 + 2 * segCount + 2 + 2 * i);
|
|
uint16_t startCode = tt_read_16(font);
|
|
if (startCode > codepoint) {
|
|
return 0;
|
|
}
|
|
tt_seek(font, font->cmap_start + 12 + 4 * segCount + 2 + 2 * i);
|
|
int16_t idDelta = tt_read_16(font);
|
|
tt_seek(font, font->cmap_start + 12 + 6 * segCount + 2 + 2 * i);
|
|
uint16_t idRangeOffset = tt_read_16(font);
|
|
if (idRangeOffset == 0) {
|
|
return idDelta + codepoint;
|
|
} else {
|
|
tt_seek(font, font->cmap_start + 12 + 6 * segCount + 2 + 2 * i + idRangeOffset + (codepoint - startCode) * 2);
|
|
return tt_read_16(font);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void midpoint(float x_0, float y_0, float cx, float cy, float x_1, float y_1, float t, float * outx, float * outy) {
|
|
float t2 = t * t;
|
|
float nt = 1.0 - t;
|
|
float nt2 = nt * nt;
|
|
*outx = nt2 * x_0 + 2 * t * nt * cx + t2 * x_1;
|
|
*outy = nt2 * y_0 + 2 * t * nt * cy + t2 * y_1;
|
|
}
|
|
|
|
static struct TT_Contour * tt_draw_glyph_into(struct TT_Contour * contour, struct TT_Font * font, float x_offset, float y_offset, unsigned int glyph) {
|
|
off_t glyf_offset = tt_get_glyph_offset(font, glyph);
|
|
if (tt_get_glyph_offset(font, glyph + 1) == glyf_offset) return contour;
|
|
|
|
tt_seek(font, font->glyf_ptr.offset + glyf_offset);
|
|
|
|
int16_t numContours = tt_read_16(font);
|
|
/* int16_t xMin = */ tt_read_16(font);
|
|
/* int16_t yMin = */ tt_read_16(font);
|
|
/* int16_t xMax = */ tt_read_16(font);
|
|
/* int16_t yMax = */ tt_read_16(font);
|
|
|
|
tt_seek(font, font->glyf_ptr.offset + glyf_offset + 10);
|
|
|
|
if (numContours > 0) {
|
|
uint16_t endPt;
|
|
for (int i = 0; i < numContours; ++i) {
|
|
endPt = tt_read_16(font);
|
|
}
|
|
uint16_t numInstr = tt_read_16(font);
|
|
for (unsigned int i = 0; i < numInstr; ++i) {
|
|
tt_read_8(font);
|
|
}
|
|
struct TT_Vertex * vertices = malloc(sizeof(struct TT_Vertex) * (endPt + 1));
|
|
for (int i = 0; i < endPt + 1; ) {
|
|
uint8_t v = tt_read_8(font);
|
|
vertices[i].flags = v;
|
|
i++;
|
|
if (v & 8) {
|
|
uint8_t repC = tt_read_8(font);
|
|
while (repC) {
|
|
vertices[i].flags = v;
|
|
repC--;
|
|
i++;
|
|
}
|
|
}
|
|
}
|
|
int last_x = 0;
|
|
int last_y = 0;
|
|
for (int i = 0; i < endPt + 1; i++) {
|
|
unsigned char flags = vertices[i].flags;
|
|
if (flags & (1 << 1)) {
|
|
/* One byte */
|
|
if (flags & (1 << 4)) {
|
|
/* Positive */
|
|
vertices[i].x = last_x + tt_read_8(font);
|
|
} else {
|
|
vertices[i].x = last_x - tt_read_8(font);
|
|
}
|
|
} else {
|
|
if (flags & (1 << 4)) {
|
|
vertices[i].x = last_x;
|
|
} else {
|
|
int16_t diff = tt_read_16(font);
|
|
vertices[i].x = last_x + diff;
|
|
}
|
|
}
|
|
last_x = vertices[i].x;
|
|
}
|
|
for (int i = 0; i < endPt + 1; i++) {
|
|
unsigned char flags = vertices[i].flags;
|
|
if (flags & (1 << 2)) {
|
|
/* One byte */
|
|
if (flags & (1 << 5)) {
|
|
/* Positive */
|
|
vertices[i].y = last_y + tt_read_8(font);
|
|
} else {
|
|
vertices[i].y = last_y - tt_read_8(font);
|
|
}
|
|
} else {
|
|
if (flags & (1 << 5)) {
|
|
vertices[i].y = last_y;
|
|
} else {
|
|
int16_t diff = tt_read_16(font);
|
|
vertices[i].y = last_y + diff;
|
|
}
|
|
}
|
|
last_y = vertices[i].y;
|
|
}
|
|
|
|
tt_seek(font, font->glyf_ptr.offset + glyf_offset + 10);
|
|
|
|
int move_next = 1;
|
|
int next_end = tt_read_16(font);
|
|
|
|
float lx = 0, ly = 0, cx = 0, cy = 0, x = 0, y = 0;
|
|
float sx = 0, sy = 0;
|
|
int wasControl = 0;
|
|
|
|
for (int i = 0; i < endPt + 1; ++i) {
|
|
x = ((float)vertices[i].x) * font->scale + x_offset;
|
|
y = (-(float)vertices[i].y) * font->scale + y_offset;
|
|
int isCurve = !(vertices[i].flags & (1 << 0));
|
|
if (move_next) {
|
|
contour = tt_contour_move_to(contour, x, y);
|
|
if (isCurve) {
|
|
/* Is the point before this on-curve? */
|
|
float px = (float)vertices[next_end].x * font->scale + x_offset;
|
|
float py = (-(float)vertices[next_end].y) * font->scale + y_offset;
|
|
if (vertices[next_end].flags & (1 << 0)) {
|
|
/* Else we're just a regular off-curve point? */
|
|
sx = px;
|
|
sy = py;
|
|
lx = px;
|
|
ly = py;
|
|
} else {
|
|
float dx = (px + x) / 2.0;
|
|
float dy = (py + y) / 2.0;
|
|
lx = dx;
|
|
ly = dy;
|
|
sx = dx;
|
|
sy = dy;
|
|
}
|
|
cx = x;
|
|
cy = y;
|
|
wasControl = 1;
|
|
} else {
|
|
lx = x;
|
|
ly = y;
|
|
sx = x;
|
|
sy = y;
|
|
wasControl = 0;
|
|
}
|
|
move_next = 0;
|
|
} else {
|
|
if (isCurve) {
|
|
if (wasControl) {
|
|
float dx = (cx + x) / 2.0;
|
|
float dy = (cy + y) / 2.0;
|
|
for (int i = 1; i < 10; ++i) {
|
|
float mx, my;
|
|
midpoint(lx,ly,cx,cy,dx,dy,(float)i / 10.0,&mx,&my);
|
|
contour = tt_contour_line_to(contour, mx, my);
|
|
}
|
|
contour = tt_contour_line_to(contour, dx, dy);
|
|
lx = dx;
|
|
ly = dy;
|
|
}
|
|
cx = x;
|
|
cy = y;
|
|
wasControl = 1;
|
|
} else {
|
|
if (wasControl) {
|
|
for (int i = 1; i < 10; ++i) {
|
|
float mx, my;
|
|
midpoint(lx,ly,cx,cy,x,y,(float)i / 10.0,&mx,&my);
|
|
contour = tt_contour_line_to(contour, mx, my);
|
|
}
|
|
}
|
|
contour = tt_contour_line_to(contour, x, y);
|
|
lx = x;
|
|
ly = y;
|
|
wasControl = 0;
|
|
}
|
|
}
|
|
if (i == next_end) {
|
|
if (wasControl) {
|
|
for (int i = 1; i < 10; ++i) {
|
|
float mx, my;
|
|
midpoint(lx,ly,cx,cy,sx,sy,(float)i / 10.0,&mx,&my);
|
|
contour = tt_contour_line_to(contour, mx, my);
|
|
}
|
|
}
|
|
contour = tt_contour_line_to(contour, sx, sy);
|
|
move_next = 1;
|
|
next_end = tt_read_16(font);
|
|
}
|
|
}
|
|
|
|
free(vertices);
|
|
} else if (numContours < 0) {
|
|
while (1) {
|
|
uint16_t flags = tt_read_16(font);
|
|
uint16_t ind = tt_read_16(font);
|
|
int16_t x, y;
|
|
if (flags & (1 << 0)) {
|
|
x = tt_read_16(font);
|
|
y = tt_read_16(font);
|
|
} else {
|
|
x = tt_read_8(font);
|
|
y = tt_read_8(font);
|
|
}
|
|
|
|
float x_f = x_offset;
|
|
float y_f = y_offset;
|
|
if (flags & (1 << 1)) {
|
|
x_f = x_offset + x * font->scale;
|
|
y_f = y_offset - y * font->scale;
|
|
}
|
|
|
|
if (flags & (1 << 3)) {
|
|
/* TODO */
|
|
tt_read_16(font);
|
|
} else if (flags & (1 << 6)) {
|
|
/* TODO */
|
|
tt_read_16(font);
|
|
tt_read_16(font);
|
|
} else if (flags & (1 << 7)) {
|
|
/* TODO */
|
|
tt_read_16(font);
|
|
tt_read_16(font);
|
|
tt_read_16(font);
|
|
tt_read_16(font);
|
|
} else {
|
|
long o = tt_tell(font);
|
|
contour = tt_draw_glyph_into(contour,font,x_f,y_f,ind);
|
|
tt_seek(font, o);
|
|
}
|
|
if (!(flags & (1 << 5))) break;
|
|
}
|
|
}
|
|
|
|
return contour;
|
|
}
|
|
|
|
sprite_t * tt_bake_glyph(struct TT_Font * font, unsigned int glyph, uint32_t color, int *_x, int *_y, float xadjust) {
|
|
struct TT_Contour * contour = tt_contour_start(0, 0);
|
|
contour = tt_draw_glyph_into(contour,font,100+xadjust,100,glyph);
|
|
if (!contour->edgeCount) {
|
|
*_x = 0;
|
|
*_y = 0;
|
|
free(contour);
|
|
return NULL;
|
|
}
|
|
|
|
/* Calculate bounds to render a sprite */
|
|
struct TT_Shape * shape = tt_contour_finish(contour);
|
|
int width = shape->lastX - shape->startX + 3;
|
|
int height = shape->lastY - shape->startY + 2;
|
|
|
|
int off_x = shape->startX - 1; shape->startX -= off_x; shape->lastX -= off_x;
|
|
int off_y = shape->startY - 1; shape->startY -= off_y; shape->lastY -= off_y;
|
|
|
|
/* Adjust the entire shape */
|
|
for (size_t i = 0; i < shape->edgeCount; ++i) {
|
|
shape->edges[i].start.x -= off_x;
|
|
shape->edges[i].end.x -= off_x;
|
|
shape->edges[i].start.y -= off_y;
|
|
shape->edges[i].end.y -= off_y;
|
|
}
|
|
|
|
*_x = off_x - 100;
|
|
*_y = off_y - 100;
|
|
|
|
/* Create sprite */
|
|
sprite_t * out = create_sprite(width,height,ALPHA_EMBEDDED);
|
|
gfx_context_t * ctx = init_graphics_sprite(out);
|
|
|
|
/* Fill to clear */
|
|
draw_fill(ctx, 0);
|
|
|
|
tt_path_paint(ctx, shape, color);
|
|
|
|
free(ctx);
|
|
free(shape);
|
|
free(contour);
|
|
return out;
|
|
}
|
|
|
|
void tt_draw_glyph(gfx_context_t * ctx, struct TT_Font * font, int x, int y, unsigned int glyph, uint32_t color) {
|
|
struct TT_Contour * contour = tt_contour_start(0, 0);
|
|
contour = tt_draw_glyph_into(contour,font,x,y,glyph);
|
|
if (contour->edgeCount) {
|
|
struct TT_Shape * shape = tt_contour_finish(contour);
|
|
tt_path_paint(ctx, shape, color);
|
|
free(shape);
|
|
}
|
|
free(contour);
|
|
}
|
|
|
|
int tt_string_width(struct TT_Font * font, const char * s) {
|
|
float x_offset = 0;
|
|
uint32_t cp = 0;
|
|
uint32_t istate = 0;
|
|
|
|
for (const unsigned char * c = (const unsigned char*)s; *c; ++c) {
|
|
if (!decode(&istate, &cp, *c)) {
|
|
unsigned int glyph = tt_glyph_for_codepoint(font, cp);
|
|
x_offset += tt_xadvance_for_glyph(font, glyph) * font->scale;
|
|
}
|
|
}
|
|
|
|
return x_offset;
|
|
}
|
|
|
|
int tt_string_width_int(struct TT_Font * font, const char * s) {
|
|
int x_offset = 0;
|
|
uint32_t cp = 0;
|
|
uint32_t istate = 0;
|
|
|
|
for (const unsigned char * c = (const unsigned char*)s; *c; ++c) {
|
|
if (!decode(&istate, &cp, *c)) {
|
|
unsigned int glyph = tt_glyph_for_codepoint(font, cp);
|
|
x_offset += tt_xadvance_for_glyph(font, glyph) * font->scale;
|
|
}
|
|
}
|
|
|
|
return x_offset;
|
|
}
|
|
|
|
float tt_glyph_width(struct TT_Font * font, unsigned int glyph) {
|
|
return tt_xadvance_for_glyph(font, glyph) * font->scale;
|
|
}
|
|
|
|
int tt_draw_string(gfx_context_t * ctx, struct TT_Font * font, int x, int y, const char * s, uint32_t color) {
|
|
struct TT_Contour * contour = tt_contour_start(0, 0);
|
|
|
|
float x_offset = x;
|
|
uint32_t cp = 0;
|
|
uint32_t istate = 0;
|
|
|
|
for (const unsigned char * c = (const unsigned char*)s; *c; ++c) {
|
|
if (!decode(&istate, &cp, *c)) {
|
|
unsigned int glyph = tt_glyph_for_codepoint(font, cp);
|
|
contour = tt_draw_glyph_into(contour,font,x_offset,y,glyph);
|
|
x_offset += tt_xadvance_for_glyph(font, glyph) * font->scale;
|
|
}
|
|
}
|
|
|
|
if (contour->edgeCount) {
|
|
struct TT_Shape * shape = tt_contour_finish(contour);
|
|
tt_path_paint(ctx, shape, color);
|
|
free(shape);
|
|
}
|
|
free(contour);
|
|
|
|
return x_offset - x;
|
|
}
|
|
|
|
|
|
static int tt_font_load(struct TT_Font * font) {
|
|
if (tt_seek(font, 4)) {
|
|
fprintf(stderr, "tt: failed to seek to 4\n");
|
|
goto _fail_free;
|
|
}
|
|
uint16_t numTables = tt_read_16(font);
|
|
if (tt_seek(font, 12)) {
|
|
fprintf(stderr, "tt: failed to seek to 12\n");
|
|
goto _fail_free;
|
|
}
|
|
|
|
for (unsigned int i = 0; i < numTables; ++i) {
|
|
uint32_t tag = tt_read_32(font);
|
|
/* uint32_t checkSum = */ tt_read_32(font);
|
|
uint32_t offset = tt_read_32(font);
|
|
uint32_t length = tt_read_32(font);
|
|
|
|
switch (tag) {
|
|
case 0x68656164: /* head */
|
|
font->head_ptr.offset = offset;
|
|
font->head_ptr.length = length;
|
|
break;
|
|
case 0x636d6170: /* cmap */
|
|
font->cmap_ptr.offset = offset;
|
|
font->cmap_ptr.length = length;
|
|
break;
|
|
case 0x676c7966: /* glyf */
|
|
font->glyf_ptr.offset = offset;
|
|
font->glyf_ptr.length = length;
|
|
break;
|
|
case 0x6c6f6361: /* loca */
|
|
font->loca_ptr.offset = offset;
|
|
font->loca_ptr.length = length;
|
|
break;
|
|
case 0x68686561: /* hhea */
|
|
font->hhea_ptr.offset = offset;
|
|
font->hhea_ptr.length = length;
|
|
break;
|
|
case 0x686d7478: /* hmtx */
|
|
font->hmtx_ptr.offset = offset;
|
|
font->hmtx_ptr.length = length;
|
|
break;
|
|
case 0x6e616d65: /* name */
|
|
font->name_ptr.offset = offset;
|
|
font->name_ptr.length = length;
|
|
break;
|
|
case 0x4f532f32: /* OS/2 */
|
|
font->os_2_ptr.offset = offset;
|
|
font->name_ptr.length = length;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!font->head_ptr.offset) { fprintf(stderr, "tt: no head table\n"); goto _fail_free; }
|
|
if (!font->glyf_ptr.offset) { fprintf(stderr, "tt: no glyf table\n"); goto _fail_free; }
|
|
if (!font->cmap_ptr.offset) { fprintf(stderr, "tt: no cmap table\n"); goto _fail_free; }
|
|
if (!font->loca_ptr.offset) { fprintf(stderr, "tt: no loca table\n"); goto _fail_free; }
|
|
|
|
/* Get emSize */
|
|
tt_seek(font, font->head_ptr.offset + 18);
|
|
font->emSize = (float)tt_read_16(font);
|
|
|
|
/* Try to pick a viable cmap */
|
|
tt_seek(font, font->cmap_ptr.offset);
|
|
|
|
uint32_t best = 0;
|
|
int bestScore = 0;
|
|
|
|
/* Read size */
|
|
/* uint16_t cmap_vers = */ tt_read_16(font);
|
|
uint16_t cmap_size = tt_read_16(font);
|
|
for (unsigned int i = 0; i < cmap_size; ++i) {
|
|
uint16_t platform = tt_read_16(font);
|
|
uint16_t type = tt_read_16(font);
|
|
uint32_t offset = tt_read_32(font);
|
|
|
|
if ((platform == 3 || platform == 0) && type == 10) {
|
|
best = offset;
|
|
bestScore = 4;
|
|
} else if (platform == 0 && type == 4) {
|
|
best = offset;
|
|
bestScore = 4;
|
|
} else if (((platform == 0 && type == 3) || (platform == 3 && type == 1)) && bestScore < 2) {
|
|
best = offset;
|
|
bestScore = 2;
|
|
}
|
|
}
|
|
|
|
if (!best) {
|
|
fprintf(stderr, "tt: TODO: unsupported cmap (best = %#x bestScore = %d)\n", best, bestScore);
|
|
goto _fail_free;
|
|
}
|
|
|
|
/* What type is this */
|
|
tt_seek(font, font->cmap_ptr.offset + best);
|
|
|
|
font->cmap_type = tt_read_16(font);
|
|
if (font->cmap_type != 12 && font->cmap_type != 4) {
|
|
fprintf(stderr, "tt: TODO: unsupported cmap indexing %d\n", font->cmap_type);
|
|
goto _fail_free;
|
|
}
|
|
|
|
font->cmap_start = font->cmap_ptr.offset + best;
|
|
|
|
tt_seek(font, font->head_ptr.offset + 50);
|
|
font->loca_type = tt_read_16(font);
|
|
|
|
return 1;
|
|
|
|
_fail_free:
|
|
return 0;
|
|
free(font);
|
|
}
|
|
|
|
struct TT_Font * tt_font_from_file(const char * fileName) {
|
|
FILE * f = fopen(fileName, "r");
|
|
if (!f) return NULL;
|
|
|
|
struct TT_Font * font = calloc(sizeof(struct TT_Font), 1);
|
|
font->filePtr = f;
|
|
font->privFlags = 1;
|
|
|
|
if (!tt_font_load(font)) goto _fail_close;
|
|
|
|
return font;
|
|
|
|
_fail_close:
|
|
fclose(f);
|
|
return NULL;
|
|
}
|
|
|
|
struct TT_Font * tt_font_from_memory(uint8_t * buffer) {
|
|
struct TT_Font * font = calloc(sizeof(struct TT_Font), 1);
|
|
font->privFlags = 0;
|
|
font->buffer = buffer;
|
|
if (!tt_font_load(font)) return NULL;
|
|
return font;
|
|
}
|
|
|
|
struct TT_Font * tt_font_from_file_mem(const char * fileName) {
|
|
FILE * f = fopen(fileName, "r");
|
|
if (!f) return NULL;
|
|
|
|
fseek(f, 0, SEEK_END);
|
|
long size = ftell(f);
|
|
fseek(f, 0, SEEK_SET);
|
|
|
|
uint8_t * buf = malloc(size);
|
|
fread(buf, 1, size, f);
|
|
|
|
fclose(f);
|
|
|
|
return tt_font_from_memory(buf);
|
|
}
|
|
|
|
static hashmap_t * shm_font_cache = NULL;
|
|
static int volatile shm_font_lock = 0;
|
|
|
|
struct TT_Font * tt_font_from_shm(const char * identifier) {
|
|
spin_lock(&shm_font_lock);
|
|
|
|
if (!shm_font_cache) {
|
|
shm_font_cache = hashmap_create(10);
|
|
}
|
|
|
|
void * fontData = hashmap_get(shm_font_cache, (char*)identifier);
|
|
if (fontData) goto shm_success;
|
|
|
|
char * display = getenv("DISPLAY");
|
|
|
|
if (!display) goto shm_fail;
|
|
|
|
char fullIdentifier[1024];
|
|
snprintf(fullIdentifier, 1023, "sys.%s.fonts.%s", display, identifier);
|
|
|
|
size_t fontSize = 0;
|
|
fontData = shm_obtain(fullIdentifier, &fontSize);
|
|
|
|
if (fontSize == 0) {
|
|
shm_release(identifier);
|
|
goto shm_fail;
|
|
}
|
|
|
|
hashmap_set(shm_font_cache, (char*)identifier, fontData);
|
|
|
|
shm_success:
|
|
spin_unlock(&shm_font_lock);
|
|
return tt_font_from_memory(fontData);
|
|
|
|
shm_fail:
|
|
spin_unlock(&shm_font_lock);
|
|
return NULL;
|
|
}
|
|
|
|
void tt_draw_string_shadow(gfx_context_t * ctx, struct TT_Font * font, char * string, int font_size, int left, int top, uint32_t text_color, uint32_t shadow_color, int blur) {
|
|
tt_set_size(font, font_size);
|
|
int w = tt_string_width(font, string);
|
|
/* TODO: We need to check the bounds of descenders and ascenders so we can fit things more correctly... */
|
|
sprite_t * _tmp_s = create_sprite(w + blur * 2, font_size + blur * 2 + 5, ALPHA_EMBEDDED);
|
|
gfx_context_t * _tmp = init_graphics_sprite(_tmp_s);
|
|
draw_fill(_tmp, rgba(0,0,0,0));
|
|
tt_draw_string(_tmp, font, blur, blur + font_size, string, shadow_color);
|
|
blur_context_box(_tmp, blur);
|
|
blur_context_box(_tmp, blur);
|
|
free(_tmp);
|
|
draw_sprite(ctx, _tmp_s, left - blur, top - blur);
|
|
sprite_free(_tmp_s);
|
|
tt_draw_string(ctx, font, left, top + font_size, string, text_color);
|
|
}
|
|
|
|
static int to_eight(uint32_t codepoint, char * out) {
|
|
memset(out, 0x00, 7);
|
|
|
|
if (codepoint < 0x0080) {
|
|
out[0] = (char)codepoint;
|
|
} else if (codepoint < 0x0800) {
|
|
out[0] = 0xC0 | (codepoint >> 6);
|
|
out[1] = 0x80 | (codepoint & 0x3F);
|
|
} else if (codepoint < 0x10000) {
|
|
out[0] = 0xE0 | (codepoint >> 12);
|
|
out[1] = 0x80 | ((codepoint >> 6) & 0x3F);
|
|
out[2] = 0x80 | (codepoint & 0x3F);
|
|
} else if (codepoint < 0x200000) {
|
|
out[0] = 0xF0 | (codepoint >> 18);
|
|
out[1] = 0x80 | ((codepoint >> 12) & 0x3F);
|
|
out[2] = 0x80 | ((codepoint >> 6) & 0x3F);
|
|
out[3] = 0x80 | ((codepoint) & 0x3F);
|
|
} else if (codepoint < 0x4000000) {
|
|
out[0] = 0xF8 | (codepoint >> 24);
|
|
out[1] = 0x80 | (codepoint >> 18);
|
|
out[2] = 0x80 | ((codepoint >> 12) & 0x3F);
|
|
out[3] = 0x80 | ((codepoint >> 6) & 0x3F);
|
|
out[4] = 0x80 | ((codepoint) & 0x3F);
|
|
} else {
|
|
out[0] = 0xF8 | (codepoint >> 30);
|
|
out[1] = 0x80 | ((codepoint >> 24) & 0x3F);
|
|
out[2] = 0x80 | ((codepoint >> 18) & 0x3F);
|
|
out[3] = 0x80 | ((codepoint >> 12) & 0x3F);
|
|
out[4] = 0x80 | ((codepoint >> 6) & 0x3F);
|
|
out[5] = 0x80 | ((codepoint) & 0x3F);
|
|
}
|
|
|
|
return strlen(out);
|
|
}
|
|
|
|
|
|
char * tt_get_name_string(struct TT_Font * font, int identifier) {
|
|
if (!font->name_ptr.offset) return NULL;
|
|
|
|
tt_seek(font, font->name_ptr.offset);
|
|
uint16_t nameFormat = tt_read_16(font);
|
|
uint16_t count = tt_read_16(font);
|
|
uint16_t stringOffset = tt_read_16(font);
|
|
|
|
if (nameFormat != 0) return NULL; /* Unsupported table format */
|
|
|
|
/* Read records until we find one that matches what we asked for, in a suitable format */
|
|
for (unsigned int i = 0; i < count; ++i) {
|
|
uint16_t platformId = tt_read_16(font);
|
|
uint16_t platformSpecificId = tt_read_16(font);
|
|
/* uint16_t languageId = */ tt_read_16(font);
|
|
uint16_t nameId = tt_read_16(font);
|
|
uint16_t length = tt_read_16(font);
|
|
uint16_t offset = tt_read_16(font);
|
|
|
|
if (nameId != identifier) continue;
|
|
if (!(platformId == 3 && platformSpecificId == 1)) continue;
|
|
|
|
char * tmp = calloc(length * 3 + 1,1); /* Should be enough ? */
|
|
char * c = tmp;
|
|
|
|
tt_seek(font, stringOffset + offset + font->name_ptr.offset);
|
|
|
|
for (unsigned int j = 0; j < length; j += 2) {
|
|
uint32_t cp = tt_read_16(font);
|
|
if (cp > 0xD7FF && cp < 0xE000) {
|
|
uint32_t highBits = cp - 0xD800;
|
|
uint32_t lowBits = tt_read_16(font) - 0xDC00;
|
|
cp = 0x10000 + (highBits << 10) + lowBits;
|
|
j += 2;
|
|
}
|
|
c += to_eight(cp, c);
|
|
}
|
|
|
|
return tmp;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
struct PenPoly {
|
|
float x;
|
|
float y;
|
|
float inner;
|
|
float outer;
|
|
float basis;
|
|
};
|
|
|
|
static float tangent(float x_0, float y_0, float x_1, float y_1) {
|
|
return fmod(atan2(y_0 - y_1, x_1 - x_0) + 2.0 * M_PI, 2.0 * M_PI);
|
|
}
|
|
|
|
static int angle_compare(float s, struct PenPoly * pen, int a) {
|
|
if (s >= pen[a].inner && s < pen[a].outer) return 0;
|
|
if (s >= pen[a].inner && pen[a].outer < pen[a].inner) return 0;
|
|
if (s < pen[a].outer && pen[a].outer < pen[a].inner) return 0;
|
|
if (s < pen[a].outer && (2.0 * M_PI + s - pen[a].outer > M_PI)) return 1;
|
|
if (s > pen[a].outer && (s - pen[a].outer > M_PI)) return 1;
|
|
return -1;
|
|
}
|
|
|
|
static int best_angle(int sides, struct PenPoly * pen, float s) {
|
|
for (int a = 0; a < sides; ++a) {
|
|
if (angle_compare(s,pen,a) == 0) return a;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
struct TT_Shape * tt_contour_stroke_shape(struct TT_Contour * in, float width) {
|
|
|
|
struct TT_Contour * stroke = tt_contour_start(0,0);
|
|
|
|
if (in->edgeCount) {
|
|
int sides = width < 1.0 ? 4 : 16;
|
|
float inner = 2.0 * M_PI / (float)sides;
|
|
float outer = (M_PI - inner) / 2.0;
|
|
struct PenPoly * pen = malloc(sizeof(struct PenPoly) * sides); /* Arbitrary */
|
|
for (int i = 0; i < sides; ++i) {
|
|
float angle = (float)i * 2.0 * M_PI / (float)sides;
|
|
pen[i].x = cos(angle) * width;
|
|
pen[i].y = -sin(angle) * width;
|
|
pen[i].basis = angle;
|
|
pen[i].inner = fmod(angle + outer, 2.0 * M_PI);
|
|
pen[i].outer = fmod(angle + outer + inner, 2.0 * M_PI);
|
|
}
|
|
|
|
|
|
int start_of_segment = 0;
|
|
int next_segment = (int)in->edgeCount;
|
|
|
|
do {
|
|
int started = 0;
|
|
int v = start_of_segment;
|
|
float s = tangent(in->edges[v].start.x, in->edges[v].start.y, in->edges[v].end.x, in->edges[v].end.y);
|
|
int a = best_angle(sides,pen,s);
|
|
|
|
while (v < (int)in->edgeCount) {
|
|
s = tangent(in->edges[v].start.x, in->edges[v].start.y, in->edges[v].end.x, in->edges[v].end.y);
|
|
stroke = (started ? tt_contour_line_to : tt_contour_move_to)(stroke, pen[a].x + in->edges[v].start.x, pen[a].y + in->edges[v].start.y);
|
|
started = 1;
|
|
int comp = angle_compare(s,pen,a);
|
|
if (comp == 0) {
|
|
if (v + 1 == (int)in->edgeCount) {
|
|
next_segment = in->edgeCount;
|
|
break;
|
|
}
|
|
if (in->edges[v+1].start.x != in->edges[v].end.x || in->edges[v+1].start.y != in->edges[v].end.y) {
|
|
next_segment = v + 1;
|
|
break;
|
|
}
|
|
v++;
|
|
} else if (comp == 1) {
|
|
a = (sides + a - 1) % sides;
|
|
} else {
|
|
a = (a + 1) % sides;
|
|
}
|
|
}
|
|
while (v >= start_of_segment) {
|
|
s = tangent(in->edges[v].end.x, in->edges[v].end.y, in->edges[v].start.x, in->edges[v].start.y);
|
|
stroke = tt_contour_line_to(stroke, in->edges[v].end.x + pen[a].x, in->edges[v].end.y + pen[a].y);
|
|
int comp = angle_compare(s,pen,a);
|
|
if (comp == 0) {
|
|
if (v == start_of_segment) break;
|
|
v--;
|
|
} else if (comp == 1) {
|
|
a = (sides + a - 1) % sides;
|
|
} else {
|
|
a = (a + 1) % sides;
|
|
}
|
|
}
|
|
while (v == start_of_segment) {
|
|
s = tangent(in->edges[v].start.x, in->edges[v].start.y, in->edges[v].end.x, in->edges[v].end.y);
|
|
stroke = tt_contour_line_to(stroke, pen[a].x + in->edges[v].start.x, pen[a].y + in->edges[v].start.y);
|
|
int comp = angle_compare(s,pen,a);
|
|
if (comp == 0) {
|
|
break;
|
|
} else if (comp == 1) {
|
|
a = (sides + a - 1) % sides;
|
|
} else {
|
|
a = (a + 1) % sides;
|
|
}
|
|
}
|
|
start_of_segment = next_segment;
|
|
} while (next_segment != (int)in->edgeCount);
|
|
|
|
free(pen);
|
|
}
|
|
|
|
struct TT_Shape * out = tt_contour_finish(stroke);
|
|
free(stroke);
|
|
return out;
|
|
}
|
|
|
|
void tt_contour_stroke_bounded(gfx_context_t * ctx, struct TT_Contour * in, uint32_t color, float width,
|
|
int x_0, int y_0, int w, int h) {
|
|
/* This is a stupid slow thing */
|
|
for (int y = y_0; y < y_0 + h; y++) {
|
|
for (int x = x_0; x < x_0 + w; x++) {
|
|
struct gfx_point p = {(float)x + 0.5, (float)y + 0.5};
|
|
/* For every line in the contour... */
|
|
float mindist = 100.0;
|
|
for (size_t i = 0; i < in->edgeCount; ++i) {
|
|
struct gfx_point v = { in->edges[i].start.x, in->edges[i].start.y };
|
|
struct gfx_point w = { in->edges[i].end.x, in->edges[i].end.y };
|
|
|
|
float mine = gfx_line_distance(&p,&v,&w);
|
|
if (mine < mindist) mindist = mine;
|
|
}
|
|
|
|
if (mindist < width + 0.5) {
|
|
if (mindist < width - 0.5) {
|
|
GFX(ctx,x,y) = alpha_blend_rgba(GFX(ctx,x,y), color);
|
|
} else {
|
|
float alpha = 1.0 - (mindist - width + 0.5);
|
|
GFX(ctx,x,y) = alpha_blend_rgba(GFX(ctx,x,y), premultiply(rgba(_RED(color),_GRE(color),_BLU(color),(int)((double)_ALP(color) * alpha))));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|