mirror of
https://github.com/daveallie/crosspoint-reader.git
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85 lines
2.5 KiB
C++
85 lines
2.5 KiB
C++
#pragma once
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#include <EpdFontFamily.h>
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#include <HardwareSerial.h>
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#include <Utf8.h>
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inline int min(const int a, const int b) { return a < b ? a : b; }
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inline int max(const int a, const int b) { return a > b ? a : b; }
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template <typename Renderable>
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class EpdFontRenderer {
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Renderable& renderer;
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void renderChar(uint32_t cp, int* x, const int* y, uint16_t color, EpdFontStyle style = REGULAR);
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public:
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const EpdFontFamily* fontFamily;
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explicit EpdFontRenderer(const EpdFontFamily* fontFamily, Renderable& renderer)
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: fontFamily(fontFamily), renderer(renderer) {}
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~EpdFontRenderer() = default;
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void renderString(const char* string, int* x, int* y, uint16_t color, EpdFontStyle style = REGULAR);
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};
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template <typename Renderable>
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void EpdFontRenderer<Renderable>::renderString(const char* string, int* x, int* y, const uint16_t color,
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const EpdFontStyle style) {
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// cannot draw a NULL / empty string
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if (string == nullptr || *string == '\0') {
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return;
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}
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// no printable characters
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if (!fontFamily->hasPrintableChars(string, style)) {
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return;
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}
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uint32_t cp;
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while ((cp = utf8NextCodepoint(reinterpret_cast<const uint8_t**>(&string)))) {
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renderChar(cp, x, y, color, style);
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}
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*y += fontFamily->getData(style)->advanceY;
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}
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template <typename Renderable>
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void EpdFontRenderer<Renderable>::renderChar(const uint32_t cp, int* x, const int* y, uint16_t color,
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const EpdFontStyle style) {
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const EpdGlyph* glyph = fontFamily->getGlyph(cp, style);
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if (!glyph) {
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// TODO: Replace with fallback glyph property?
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glyph = fontFamily->getGlyph('?', style);
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}
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// no glyph?
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if (!glyph) {
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Serial.printf("No glyph for codepoint %d\n", cp);
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return;
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}
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const uint32_t offset = glyph->dataOffset;
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const uint8_t width = glyph->width;
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const uint8_t height = glyph->height;
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const int left = glyph->left;
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const uint8_t* bitmap = nullptr;
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bitmap = &fontFamily->getData(style)->bitmap[offset];
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if (bitmap != nullptr) {
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for (int glyphY = 0; glyphY < height; glyphY++) {
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int screenY = *y - glyph->top + glyphY;
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for (int glyphX = 0; glyphX < width; glyphX++) {
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const int pixelPosition = glyphY * width + glyphX;
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int screenX = *x + left + glyphX;
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const uint8_t byte = bitmap[pixelPosition / 8];
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const uint8_t bit_index = 7 - (pixelPosition % 8);
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if ((byte >> bit_index) & 1) {
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renderer.drawPixel(screenX, screenY, color);
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}
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}
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}
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}
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*x += glyph->advanceX;
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}
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