Exemple #1
0
// store image inside png
void SaveImage(const TImage& image, const string& destFile) {
    vector<unsigned char> result(image.width() * image.height() * 4);
    unsigned char* d;
    const unsigned char* r = image.data(0, 0, 0, 0);
    const unsigned char* g = image.data(0, 0, 0, 1);
    const unsigned char* b = image.data(0, 0, 0, 2);
    int sp = image.spectrum();
    if (sp == 4) {
        const unsigned char* a = image.data(0, 0, 0, 3);
        for (d = result.data(); d < result.data() + result.size();) {
            *(d++) = *(r++);
            *(d++) = *(g++);
            *(d++) = *(b++);
            *(d++) = *(a++);
        }
    } else if (sp == 3) {
        for (d = result.data(); d < result.data() + result.size();) {
            *(d++) = *(r++);
            *(d++) = *(g++);
            *(d++) = *(b++);
            *(d++) = 255;
        }
    } else {
        throw UException("failed to save image - wrong type");
    }
    size_t err = lodepng::encode(destFile, result, image.width(), image.height());
    if (err) {
        throw UException(lodepng_error_text(err));
    }
}
Exemple #2
0
void TThumbGeneratorImpl::DrawText(TImage& image, size_t x, size_t y, const wstring& wtext, size_t size) {
    float scale = stbtt_ScaleForPixelHeight(&Font, size);

    int w, h, xo, yo;
    unsigned char* r = image.data(0, 0, 0, 0);
    unsigned char* g = image.data(0, 0, 0, 1);
    unsigned char* b = image.data(0, 0, 0, 2);

    size_t pos = x;
    for (size_t i = 0; i < wtext.size(); i++) {
        if (iswspace(wtext[i])) {
            pos += size * 0.3;
            continue;
        }
        unsigned char* d = stbtt_GetCodepointBitmap(&Font, 0, scale, wtext[i], &w, &h, &xo, &yo);
        for (size_t wx = 0; wx < w; wx++) {
            for (size_t wy = 0; wy < h; wy++) {
                size_t cx = pos + wx + xo;
                size_t cy = y + wy + yo + size;
                if (cy >= image.height() ||
                        cx >= image.width())
                {
                    continue;
                }
                size_t dcord = image.width() * cy + cx;
                size_t scord = wy * w + wx;
                r[dcord] = d[scord];
                g[dcord] = d[scord];
                b[dcord] = d[scord];
            }
        }
        pos += w;
    }
}