我最近刚刚开始使用 FreeType 库并开始尝试从缓冲区复制到 directx9 纹理。
尽管从通过加载单个字符创建的缓冲区复制,但我目前正在出现双字母,如下所示:
[尝试复制字符'a']
以下是我当前的代码:
void TexFont::freeTypeSave()
{
static FT_Library library; /* handle to library */
static FT_Face face; /* handle to face object */
if (FT_Init_FreeType(&library)) {
NHelper::OutputDebugStringN("error");
}
if (FT_New_Face(library,TEXT("Fonts\\arial.ttf"),0,&face)) {
NHelper::OutputDebugStringN("font load failed\n");
}
else {
//NHelper::OutputDebugStringN("font faces: %d \n", face->num_faces);
}
static int error;
static UINT width, height;
static int mTtfSize = 64;
static int mTtfResolution = 96;
static IDirect3DTexture9* mTexture;
static unsigned int mPixelBytes = 2;
static unsigned int mDataSize = width * height * mPixelBytes;
// size settings (convert font size to *64)
FT_F26Dot6 ftSize = (FT_F26Dot6)(mTtfSize * (1 << 6));
error=FT_Set_Char_Size(face, ftSize, 0, mTtfResolution, mTtfResolution);
// load glyph + render
error = FT_Load_Char( face, L'a', FT_LOAD_RENDER );
if (error)
NHelper::OutputDebugStringN("could not load char");
// start copy procedure
width = face->glyph->bitmap.width;
height = face->glyph->bitmap.rows;
D3DXCreateTexture(
g_engine->getDevice(),
width, height,
1, 0,
D3DFMT_A8L8, D3DPOOL_MANAGED,
&mTexture);
D3DLOCKED_RECT lockedRect;
mTexture->LockRect(0, &lockedRect,0, 0);
unsigned char* pSrcPixels = face->glyph->bitmap.buffer;
unsigned char* pDestPixels = (unsigned char*)lockedRect.pBits;
for(UINT i = 0; i < height; ++i)
{
//copy a row
memcpy(pDestPixels, pSrcPixels, width * 2); //2 bytes per pixel (1byte alpha, 1byte greyscale)
//advance row pointers
pSrcPixels += face->glyph->bitmap.pitch;
pDestPixels += lockedRect.Pitch;
}
NHelper::OutputDebugStringN("char width: %d, height: %d \n", width, height);
mTexture->UnlockRect(0);
D3DXSaveTextureToFileA("test.png",D3DXIFF_PNG, mTexture, 0);
// release face
FT_Done_Face(face);
// library shutdown
FT_Done_FreeType(library);
}
关于正在发生的事情以及如何解决此问题的任何想法?
注意:更改字体大小只会创建更大的图像。我仍然得到相同的结果。
- 更新 -
尝试 Drop 的建议,我尝试改变我的memcpy(pDestPixels, pSrcPixels, width * 2);
它返回memcpy(pDestPixels, pSrcPixels, width * 1);
以下内容:
一个字形挤在图像的左侧,但图像的大小保持不变。(字形只占图像空间的一半)