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0906dc919b
* [mpy/kandinsky] Use good colors * [kandinsky/context_text] Avoid returning to pos x=0 on new line, use arg's x coordinate instead
80 lines
3.5 KiB
C++
80 lines
3.5 KiB
C++
#include <assert.h>
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#include <kandinsky/context.h>
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#include <kandinsky/font.h>
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#include <ion/unicode/utf8_decoder.h>
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#include <ion/display.h>
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constexpr static int k_tabCharacterWidth = 4;
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KDPoint KDContext::drawString(const char * text, KDPoint p, const KDFont * font, KDColor textColor, KDColor backgroundColor, int maxByteLength) {
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return pushOrPullString(text, p, font, textColor, backgroundColor, maxByteLength, true);
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}
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int KDContext::checkDrawnString(const char * text, KDPoint p, const KDFont * font, KDColor textColor, KDColor backgroundColor, int maxLength) {
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int numberOfFailedPixels = 0;
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pushOrPullString(text, p, font, textColor, backgroundColor, maxLength, false, &numberOfFailedPixels);
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return numberOfFailedPixels;
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}
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KDPoint KDContext::pushOrPullString(const char * text, KDPoint p, const KDFont * font, KDColor textColor, KDColor backgroundColor, int maxByteLength, bool push, int * result) {
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KDPoint position = p;
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KDSize glyphSize = font->glyphSize();
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KDFont::RenderPalette palette = font->renderPalette(textColor, backgroundColor);
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KDFont::GlyphBuffer glyphBuffer;
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UTF8Decoder decoder(text);
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const char * codePointPointer = decoder.stringPosition();
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CodePoint codePoint = decoder.nextCodePoint();
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while (codePoint != UCodePointNull && (maxByteLength < 0 || codePointPointer < text + maxByteLength)) {
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codePointPointer = decoder.stringPosition();
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if (codePoint == UCodePointLineFeed) {
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assert(position.y() < KDCOORDINATE_MAX - glyphSize.height());
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position = KDPoint(p.x(), position.y() + glyphSize.height());
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codePoint = decoder.nextCodePoint();
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} else if (codePoint == UCodePointTabulation) {
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position = position.translatedBy(KDPoint(k_tabCharacterWidth * glyphSize.width(), 0));
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codePoint = decoder.nextCodePoint();
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} else {
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assert(!codePoint.isCombining());
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font->setGlyphGrayscalesForCodePoint(codePoint, &glyphBuffer);
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codePoint = decoder.nextCodePoint();
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while (codePoint.isCombining()) {
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font->accumulateGlyphGrayscalesForCodePoint(codePoint, &glyphBuffer);
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codePointPointer = decoder.stringPosition();
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codePoint = decoder.nextCodePoint();
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}
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font->colorizeGlyphBuffer(&palette, &glyphBuffer);
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if (push) {
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// Push the character on the screen
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fillRectWithPixels(
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KDRect(position, glyphSize),
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glyphBuffer.colorBuffer(),
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glyphBuffer.colorBuffer() // It's OK to trash the content of the color buffer since we'll re-fetch it for the next char anyway
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);
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} else {
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// Pull and compare the character from the screen
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assert(result != nullptr);
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*result = 0;
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KDFont::GlyphBuffer workingGlyphBuffer;
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KDColor * workingColorBuffer = workingGlyphBuffer.colorBuffer();
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KDColor * colorBuffer = glyphBuffer.colorBuffer();
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for (int i = 0; i < glyphSize.height() * glyphSize.width(); i++) {
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workingColorBuffer[i] = KDColorRed;
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}
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/* Caution: Unlike fillRectWithPixels, pullRect accesses outside (0, 0,
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* Ion::Display::Width, Ion::Display::Height) might give weird data. */
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Ion::Display::pullRect(KDRect(position, glyphSize), workingColorBuffer);
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for (int k = 0; k < glyphSize.height() * glyphSize.width(); k++) {
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if (colorBuffer[k] != workingColorBuffer[k]) {
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*result = (*result)+1;
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break;
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}
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}
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}
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position = position.translatedBy(KDPoint(glyphSize.width(), 0));
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}
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}
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return position;
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}
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