Question

我正在使用Visual leak detector搜索我的程序内存泄漏，但无法找到如何摆脱FT_Load_Char泄漏，文档也没有说明GlyphSlot的内存释放...

这是我的代码snipplet，其中w得到大约350字节的泄漏。

// creating ascii symbol map
for (int i = 32; i < 128; i++) {
    if (FT_Load_Char(face, i, FT_LOAD_RENDER)) { // leak comes from here
        fprintf(stderr, "Loading character %c failed!\n", i);
        continue;
    }

    glTexSubImage2D(GL_TEXTURE_2D, 0, ox, oy, g->bitmap.width, g->bitmap.rows, 
        GL_ALPHA, GL_UNSIGNED_BYTE, g->bitmap.buffer);

    float ax = g->advance.x >> 6;
    float ay = ay = g->advance.y >> 6;

    float bw = g->bitmap.width;
    float bh = g->bitmap.rows;

    float bl = g->bitmap_left;
    float bt = g->bitmap_top;

    m_GlyphMap[i] = Glyph(ax,ay, bw, bh, bl, bt, ox, oy);

    ox += g->bitmap.width + 1;

    // there should be some sort of deallociation...
}

所以主要问题：是否有一些功能可以解除分配我丢失的GlyphSlot？或者它是Freetype中的错误？

Answer 1

确保在关闭程序或停止使用freetype后调用 FT_Done_FreeType（lib _）; 。如果不是这种情况，请确保使用的是最新的freetype版本。我有几乎相同的循环，它在Windows 8 x64上运行正常。这是我的代码：

for (UINT32 i = 0; i < text.length(); i++) {
    err_ = FT_Load_Char(face_, text[i], FT_LOAD_RENDER);
    if (err_) {
        LOGW("Unable to select, load and render character."
            " Error code: %d", err_);
        continue;
    }
    FT_Bitmap bitmap = glyphSlot->bitmap;
    FT_UInt glyphIndex = FT_Get_Char_Index(face_, text[i]);
    err_ = FT_Get_Kerning(face_, previous, glyphIndex,
        FT_KERNING_DEFAULT, &delta);
    if (err_) {
        LOGW("Unable to get kerning for character."
            " Error code: %d", err_);
        continue;
    }
    Glyph tmp;
    tmp.kerningOffset = delta.x >> 6;
    tmp.buffer = new UINT8[bitmap.rows * bitmap.width];
    memcpy(tmp.buffer, bitmap.buffer, bitmap.rows * bitmap.width);
    tmp.height = bitmap.rows;
    tmp.width = bitmap.width;
    tmp.offsetLeft = glyphSlot->bitmap_left;
    if (tmp.offsetLeft < 0) {
        tmp.offsetLeft = 0;
    }
    tmp.offsetTop = glyphSlot->bitmap_top;
    tmp.advanceX = glyphSlot->advance.x >> 6;
    tmp.advanceY = glyphSlot->advance.y >> 6;
    glyphs.push_back(tmp);
    previous = glyphIndex;
    width += tmp.advanceX + tmp.kerningOffset;
}

如果单独分配符号缓冲区，也不要忘记删除符号缓冲区：

for (SIZE i = 0; i < glyphs.size(); i++) {
    Glyph g = glyphs[i];
    delete [] g.buffer;
}

Freetype2 FT_Load_Char内存泄漏

1 个答案: