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Improved error correction consistency for inverse Y-axis

This commit is contained in:
Chlumsky 2024-06-01 16:05:25 +02:00
parent cddd6c7308
commit 5ec8cef4c2
2 changed files with 9 additions and 12 deletions
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17
README.md
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@ -113,25 +113,23 @@ in order to generate a distance field. Please note that all classes and function
Example:
```c++
#include "msdfgen.h"
#include "msdfgen-ext.h"
#include <msdfgen.h>
#include <msdfgen-ext.h>
using namespace msdfgen;
int main() {
FreetypeHandle *ft = initializeFreetype();
if (ft) {
FontHandle *font = loadFont(ft, "C:\\Windows\\Fonts\\arialbd.ttf");
if (font) {
if (FreetypeHandle *ft = initializeFreetype()) {
if (FontHandle *font = loadFont(ft, "C:\\Windows\\Fonts\\arialbd.ttf")) {
Shape shape;
if (loadGlyph(shape, font, 'A')) {
if (loadGlyph(shape, font, 'A', FONT_SCALING_EM_NORMALIZED)) {
shape.normalize();
// max. angle
edgeColoringSimple(shape, 3.0);
// output width, height
Bitmap<float, 3> msdf(32, 32);
// scale, translation
SDFTransformation t(Projection(1.0, Vector2(4.0, 4.0)), Range(4.0));
// scale, translation (in em's)
SDFTransformation t(Projection(32.0, Vector2(0.125, 0.125)), Range(0.125));
generateMSDF(msdf, shape, t);
savePng(msdf, "output.png");
}
@ -141,7 +139,6 @@ int main() {
}
return 0;
}
```
## Using a multi-channel distance field

4
core/MSDFErrorCorrection.cpp
View File

@ -129,10 +129,10 @@ void MSDFErrorCorrection::protectCorners(const Shape &shape) {
if (!(commonColor&(commonColor-1))) {
// Find the four texels that envelop the corner and mark them as protected.
Point2 p = transformation.project((*edge)->point(0));
if (shape.inverseYAxis)
p.y = stencil.height-p.y;
int l = (int) floor(p.x-.5);
int b = (int) floor(p.y-.5);
if (shape.inverseYAxis)
b = stencil.height-b-2;
int r = l+1;
int t = b+1;
// Check that the positions are within bounds.