mirror of https://github.com/bjornbytes/lovr.git
242 lines
7.1 KiB
C
242 lines
7.1 KiB
C
#include "data/rasterizer.h"
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#include "data/blob.h"
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#include "data/image.h"
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#include "resources/VarelaRound.ttf.h"
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#include "util.h"
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#include "lib/stb/stb_truetype.h"
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#include <msdfgen-c.h>
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#include <stdlib.h>
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#include <string.h>
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#include <math.h>
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struct Rasterizer {
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uint32_t ref;
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stbtt_fontinfo font;
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struct Blob* blob;
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float size;
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float scale;
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int glyphCount;
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int height;
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int advance;
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int ascent;
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int descent;
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};
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Rasterizer* lovrRasterizerCreate(Blob* blob, float size) {
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Rasterizer* rasterizer = calloc(1, sizeof(Rasterizer));
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lovrAssert(rasterizer, "Out of memory");
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rasterizer->ref = 1;
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stbtt_fontinfo* font = &rasterizer->font;
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const unsigned char* data = blob ? blob->data : src_resources_VarelaRound_ttf;
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if (!stbtt_InitFont(font, data, stbtt_GetFontOffsetForIndex(data, 0))) {
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lovrThrow("Problem loading font");
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}
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lovrRetain(blob);
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rasterizer->blob = blob;
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rasterizer->size = size;
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rasterizer->scale = stbtt_ScaleForMappingEmToPixels(font, size);
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rasterizer->glyphCount = font->numGlyphs;
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int ascent, descent, linegap;
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stbtt_GetFontVMetrics(font, &ascent, &descent, &linegap);
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rasterizer->ascent = roundf(ascent * rasterizer->scale);
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rasterizer->descent = roundf(descent * rasterizer->scale);
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rasterizer->height = roundf((ascent - descent + linegap) * rasterizer->scale);
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int x0, y0, x1, y1;
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stbtt_GetFontBoundingBox(font, &x0, &y0, &x1, &y1);
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rasterizer->advance = roundf(x1 * rasterizer->scale);
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return rasterizer;
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}
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void lovrRasterizerDestroy(void* ref) {
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Rasterizer* rasterizer = ref;
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lovrRelease(rasterizer->blob, lovrBlobDestroy);
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free(rasterizer);
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}
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float lovrRasterizerGetSize(Rasterizer* rasterizer) {
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return rasterizer->size;
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}
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int lovrRasterizerGetGlyphCount(Rasterizer* rasterizer) {
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return rasterizer->glyphCount;
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}
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int lovrRasterizerGetHeight(Rasterizer* rasterizer) {
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return rasterizer->height;
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}
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int lovrRasterizerGetAdvance(Rasterizer* rasterizer) {
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return rasterizer->advance;
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}
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int lovrRasterizerGetAscent(Rasterizer* rasterizer) {
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return rasterizer->ascent;
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}
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int lovrRasterizerGetDescent(Rasterizer* rasterizer) {
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return rasterizer->descent;
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}
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bool lovrRasterizerHasGlyph(Rasterizer* rasterizer, uint32_t character) {
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return stbtt_FindGlyphIndex(&rasterizer->font, character) != 0;
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}
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bool lovrRasterizerHasGlyphs(Rasterizer* rasterizer, const char* str) {
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const char* end = str + strlen(str);
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unsigned int codepoint;
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size_t bytes;
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bool hasGlyphs = true;
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while ((bytes = utf8_decode(str, end, &codepoint)) > 0) {
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hasGlyphs &= lovrRasterizerHasGlyph(rasterizer, codepoint);
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str += bytes;
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}
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return hasGlyphs;
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}
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void lovrRasterizerLoadGlyph(Rasterizer* rasterizer, uint32_t character, uint32_t padding, double spread, Glyph* glyph) {
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int glyphIndex = stbtt_FindGlyphIndex(&rasterizer->font, character);
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lovrAssert(glyphIndex, "No font glyph found for character code %d, try using Rasterizer:hasGlyphs", character);
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int advance, bearing;
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stbtt_GetGlyphHMetrics(&rasterizer->font, glyphIndex, &advance, &bearing);
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if (stbtt_IsGlyphEmpty(&rasterizer->font, glyphIndex)) {
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memset(glyph, 0, sizeof(Glyph));
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glyph->advance = roundf(advance * rasterizer->scale);
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return;
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}
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// Trace glyph outline
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stbtt_vertex* vertices;
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int vertexCount = stbtt_GetGlyphShape(&rasterizer->font, glyphIndex, &vertices);
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msShape* shape = msShapeCreate();
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msContour* contour = NULL;
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float x = 0.f;
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float y = 0.f;
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for (int i = 0; i < vertexCount; i++) {
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stbtt_vertex vertex = vertices[i];
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float x2 = vertex.x * rasterizer->scale;
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float y2 = vertex.y * rasterizer->scale;
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switch (vertex.type) {
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case STBTT_vmove:
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contour = msShapeAddContour(shape);
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break;
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case STBTT_vline:
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msContourAddLinearEdge(contour, x, y, x2, y2);
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break;
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case STBTT_vcurve: {
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float cx = vertex.cx * rasterizer->scale;
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float cy = vertex.cy * rasterizer->scale;
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msContourAddQuadraticEdge(contour, x, y, cx, cy, x2, y2);
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break;
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}
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case STBTT_vcubic: {
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float cx1 = vertex.cx * rasterizer->scale;
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float cy1 = vertex.cy * rasterizer->scale;
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float cx2 = vertex.cx1 * rasterizer->scale;
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float cy2 = vertex.cy1 * rasterizer->scale;
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msContourAddCubicEdge(contour, x, y, cx1, cy1, cx2, cy2, x2, y2);
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break;
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}
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}
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x = x2;
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y = y2;
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}
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stbtt_FreeShape(&rasterizer->font, vertices);
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int x0, y0, x1, y1;
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stbtt_GetGlyphBox(&rasterizer->font, glyphIndex, &x0, &y0, &x1, &y1);
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// Initialize glyph data
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glyph->x = 0;
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glyph->y = 0;
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glyph->w = ceilf((x1 - x0) * rasterizer->scale);
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glyph->h = ceilf((y1 - y0) * rasterizer->scale);
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glyph->tw = glyph->w + 2 * padding;
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glyph->th = glyph->h + 2 * padding;
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glyph->dx = roundf(bearing * rasterizer->scale);
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glyph->dy = roundf(y1 * rasterizer->scale);
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glyph->advance = roundf(advance * rasterizer->scale);
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glyph->data = lovrImageCreate(glyph->tw, glyph->th, NULL, 0, FORMAT_RGBA32F);
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// Render SDF
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float tx = (float) padding + -glyph->dx;
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float ty = (float) padding + (float) glyph->h - glyph->dy;
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msShapeNormalize(shape);
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msEdgeColoringSimple(shape, 3., 0);
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msGenerateMTSDF(glyph->data->blob->data, glyph->tw, glyph->th, shape, spread, 1.f, 1.f, tx, ty);
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msShapeDestroy(shape);
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}
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int32_t lovrRasterizerGetKerning(Rasterizer* rasterizer, uint32_t left, uint32_t right) {
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return stbtt_GetCodepointKernAdvance(&rasterizer->font, left, right) * rasterizer->scale;
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}
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void lovrRasterizerMeasure(Rasterizer* rasterizer, const char* str, size_t length, float wrap, float* width, float* lastLineWidth, float* height, uint32_t* lineCount, uint32_t* glyphCount) {
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float x = 0.f;
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const char* end = str + length;
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size_t bytes;
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unsigned int previous = '\0';
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unsigned int codepoint;
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*width = 0.f;
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*lastLineWidth = 0.f;
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*lineCount = 0;
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*glyphCount = 0;
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while ((bytes = utf8_decode(str, end, &codepoint)) > 0) {
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if (codepoint == '\n' || (wrap && x > wrap && (codepoint == ' ' || previous == ' '))) {
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*width = MAX(*width, x);
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(*lineCount)++;
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x = 0.f;
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previous = '\0';
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if (codepoint == ' ' || codepoint == '\n') {
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str += bytes;
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continue;
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}
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}
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// Tabs
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if (codepoint == '\t') {
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int glyphIndex = stbtt_FindGlyphIndex(&rasterizer->font, ' ');
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int advance, bearing;
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stbtt_GetGlyphHMetrics(&rasterizer->font, glyphIndex, &advance, &bearing);
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x += advance * 4.f;
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str += bytes;
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continue;
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}
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int glyphIndex = stbtt_FindGlyphIndex(&rasterizer->font, codepoint);
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int advance, bearing;
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stbtt_GetGlyphHMetrics(&rasterizer->font, glyphIndex, &advance, &bearing);
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int x0, y0, x1, y1;
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if (stbtt_GetGlyphBox(&rasterizer->font, glyphIndex, &x0, &y0, &x1, &y1)) {
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float w = ceilf((x1 - x0) * rasterizer->scale);
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float h = ceilf((y1 - y0) * rasterizer->scale);
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if (w > 0 && h > 0) {
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(*glyphCount)++;
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}
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}
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x += roundf(advance * rasterizer->scale) + lovrRasterizerGetKerning(rasterizer, previous, codepoint);
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previous = codepoint;
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str += bytes;
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}
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*width = MAX(*width, x);
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*lastLineWidth = x;
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*height = ((*lineCount + 1) * lovrRasterizerGetHeight(rasterizer));
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}
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