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实现字体描边

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遗留问题：字体绘制的位置不正确
serial
BlueMatthew 1 year ago
parent db9047a97d
commit e53f70f2c8
2 changed files with 357 additions and 31 deletions
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371
app/src/main/cpp/CvText.cpp
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@ -18,6 +18,77 @@ namespace cv {
using namespace std;
#if (('1234' >> 24) == '1')
#elif (('4321' >> 24) == '1')
#define BIG_ENDIAN
#else
#error "Couldn't determine the endianness!"
#endif
struct Vec2
{
Vec2() { }
Vec2(float a, float b)
: x(a), y(b) { }
float x, y;
};
struct Rect
{
Rect() { }
Rect(float left, float top, float right, float bottom)
: xmin(left), xmax(right), ymin(top), ymax(bottom) { }
void Include(const Vec2 &r)
{
xmin = MIN(xmin, r.x);
ymin = MIN(ymin, r.y);
xmax = MAX(xmax, r.x);
ymax = MAX(ymax, r.y);
}
float Width() const { return xmax - xmin + 1; }
float Height() const { return ymax - ymin + 1; }
float xmin, xmax, ymin, ymax;
};
// A horizontal pixel span generated by the FreeType renderer.
struct Span
{
Span() { }
Span(int _x, int _y, int _width, int _coverage)
: x(_x), y(_y), width(_width), coverage(_coverage) { }
int x, y, width, coverage;
};
typedef std::vector<Span> Spans;
// Each time the renderer calls us back we just push another span entry on
// our list.
void RasterCallback(const int y, const int count, const FT_Span * const spans, void * const user)
{
Spans *sptr = (Spans *)user;
for (int i = 0; i < count; ++i)
sptr->push_back(Span(spans[i].x, y, spans[i].len, spans[i].coverage));
}
// Set up the raster parameters and render the outline.
void RenderSpans(FT_Library &library, FT_Outline * const outline, Spans *spans)
{
FT_Raster_Params params;
memset(&params, 0, sizeof(params));
params.flags = FT_RASTER_FLAG_AA | FT_RASTER_FLAG_DIRECT;
params.gray_spans = RasterCallback;
params.user = spans;
FT_Outline_Render(library, outline, &params);
}
class FreeType2Impl : public FreeType2
{
public:
@ -30,10 +101,7 @@ namespace cv {
int fontHeight, Scalar color,
int thickness, int line_type, bool bottomLeftOrigin
);
Size getTextSize(
const String& text, int fontHeight, int thickness,
CV_OUT int* baseLine
);
Size getTextSize(const String& text, int fontHeight, int thickness, CV_OUT int* baseLine);
private:
FT_Library mLibrary;
@ -61,6 +129,12 @@ namespace cv {
int thickness, int line_type, bool bottomLeftOrigin
);
void putTextStroker(
InputOutputArray img, const String& text, Point org,
int fontHeight, Scalar color,
int thickness, int line_type, bool bottomLeftOrigin
);
typedef void (putPixel_mono_fn)(Mat& _dst, const int _py, const int _px, const uint8_t *_col);
putPixel_mono_fn putPixel_8UC1_mono;
putPixel_mono_fn putPixel_8UC3_mono;
@ -73,13 +147,8 @@ namespace cv {
static int mvFn(const FT_Vector *to, void * user);
static int lnFn(const FT_Vector *to, void * user);
static int coFn(const FT_Vector *cnt,
const FT_Vector *to,
void * user);
static int cuFn(const FT_Vector *cnt1,
const FT_Vector *cnt2,
const FT_Vector *to,
void * user);
static int coFn(const FT_Vector *cnt, const FT_Vector *to, void * user);
static int cuFn(const FT_Vector *cnt1, const FT_Vector *cnt2, const FT_Vector *to, void * user);
/**
* Convert from FT_F26Dot6 to int(coodinate of OpenCV)
@ -160,6 +229,7 @@ namespace cv {
}
CV_Assert(mHb_font != NULL);
#endif
mIsFaceAvailable = true;
}
@ -209,8 +279,8 @@ namespace cv {
}
}
else {
putTextOutline(_img, _text, _org, _fontHeight, _color,
_thickness, _line_type, _bottomLeftOrigin);
// putTextOutline(_img, _text, _org, _fontHeight, _color, _thickness, _line_type, _bottomLeftOrigin);
putTextStroker(_img, _text, _org, _fontHeight, _color, _thickness, _line_type, _bottomLeftOrigin);
}
}
@ -267,9 +337,7 @@ namespace cv {
FT_Outline_Transform(&outline, &mtx);
// Move to current position ( in FreeType coordinates )
FT_Outline_Translate(&outline,
currentPos.x,
currentPos.y);
FT_Outline_Translate(&outline, currentPos.x, currentPos.y);
// Draw ( in FreeType coordinates )
CV_Assert(!FT_Outline_Decompose(&outline, &mFn, (void*)userData));
@ -282,6 +350,262 @@ namespace cv {
currentPos.y += mFace->glyph->advance.y;
}
delete userData;
#if defined(USING_HB)
hb_buffer_destroy(hb_buffer);
#endif 0
}
void FreeType2Impl::putTextStroker(
InputOutputArray _img, const String& _text, Point _org,
int _fontHeight, Scalar _color,
int _thickness, int _line_type, bool _bottomLeftOrigin)
{
#if 0
hb_buffer_t *hb_buffer = hb_buffer_create();
CV_Assert(hb_buffer != NULL);
hb_buffer_add_utf8(hb_buffer, _text.c_str(), -1, 0, -1);
hb_buffer_guess_segment_properties(hb_buffer);
hb_shape(mHb_font, hb_buffer, NULL, 0);
unsigned int textLen = 0;
hb_glyph_info_t *info =
hb_buffer_get_glyph_infos(hb_buffer, &textLen);
CV_Assert(info != NULL);
#else
std::wstring_convert<std::codecvt_utf8_utf16<wchar_t>> converter;
wstring wstr = converter.from_bytes(_text);
#endif
Mat& mat = _img.getMatRef();
/*
PathUserData *userData = new PathUserData(_img);
userData->mColor = _color;
userData->mCtoL = mCtoL;
userData->mThickness = _thickness;
userData->mLine_type = _line_type;
*/
int offsetY = 0;
int imgHeight = mat.rows;
// Initilize currentPosition ( in FreeType coordinates)
FT_Vector currentPos = { 0,0 };
currentPos.x = _org.x * 64;
currentPos.y = _org.y * 64;
// Update currentPosition with bottomLeftOrigin ( in FreeType coordinates)
if (_bottomLeftOrigin != true) {
currentPos.y += _fontHeight * 64;
currentPos.y = imgHeight * 64 - currentPos.y;
}
// To Freetype coordinates
FT_BBox bbox, glyph_bbox;
FT_Vector pen{ 0, 0 };
bbox.xMin = bbox.yMin = 32000;
bbox.xMax = bbox.yMax = -32000;
// Get some metrics of our image.
// int imgWidth = mat.cols;
cv::Vec3b outlineColor = cv::Vec3b(255 - (uchar)_color[0], 255 - (uchar)_color[1], 255 - (uchar)_color[2]);
cv::Vec3b fontColor = cv::Vec3b((uchar)_color[0], (uchar)_color[1], (uchar)_color[2]);
#if defined(USING_HB)
for (unsigned int i = 0; i < textLen; i++)
{
CV_Assert(!FT_Load_Glyph(mFace, info[i].codepoint, 0));
#else
for (unsigned int i = 0; i < wstr.size(); i++)
{
FT_Set_Transform(mFace, 0, &pen);
CV_Assert(!FT_Load_Glyph(mFace, FT_Get_Char_Index(mFace, wstr[i]), FT_LOAD_RENDER));
#endif
FT_GlyphSlot slot = mFace->glyph;
FT_Glyph glyph = NULL;
int error = FT_Get_Glyph(mFace->glyph, &glyph);
if (error)
{
printf("FT_Get_Glyph error!\n");
break;
}
FT_Glyph_Get_CBox(glyph, FT_GLYPH_BBOX_TRUNCATE, &glyph_bbox);
if (glyph_bbox.xMin < bbox.xMin)
bbox.xMin = glyph_bbox.xMin;
if (glyph_bbox.yMin < bbox.yMin)
bbox.yMin = glyph_bbox.yMin;
if (glyph_bbox.xMax > bbox.xMax)
bbox.xMax = glyph_bbox.xMax;
if (glyph_bbox.yMax > bbox.yMax)
bbox.yMax = glyph_bbox.yMax;
pen.x += slot->advance.x;
pen.y += slot->advance.y;
}
currentPos.x -= bbox.xMin * 64;
currentPos.y -= bbox.yMax * 64;
#if defined(USING_HB)
for (unsigned int i = 0; i < textLen; i++)
{
CV_Assert(!FT_Load_Glyph(mFace, info[i].codepoint, 0));
#else
for (unsigned int i = 0; i < wstr.size(); i++)
{
// if (_bottomLeftOrigin != true)
{
FT_Set_Transform(mFace, 0, &currentPos);
}
CV_Assert(!FT_Load_Glyph(mFace, FT_Get_Char_Index(mFace, wstr[i]), FT_LOAD_NO_BITMAP));
#endif
FT_GlyphSlot slot = mFace->glyph;
FT_Outline outline = slot->outline;
// Flip ( in FreeType coordinates )
FT_Matrix mtx = { 1 << 16 , 0 , 0 , -(1 << 16) };
// FT_Outline_Transform(&outline, &mtx);
// Move to current position ( in FreeType coordinates )
FT_Outline_Translate(&outline, currentPos.x, currentPos.y);
Spans spans;
RenderSpans(mLibrary, &outline, &spans);
// Next we need the spans for the outline.
Spans outlineSpans;
// Set up a stroker.
FT_Stroker stroker = NULL;
FT_Stroker_New(mLibrary, &stroker);
FT_Stroker_Set(stroker, (int)(_thickness * 64), FT_STROKER_LINECAP_ROUND, FT_STROKER_LINEJOIN_ROUND, 0);
FT_Glyph glyph = NULL;
if (FT_Get_Glyph(slot, &glyph) == 0)
{
FT_Glyph_Get_CBox(glyph, FT_GLYPH_BBOX_TRUNCATE, &glyph_bbox);
FT_Glyph_StrokeBorder(&glyph, stroker, 0, 1);
// Again, this needs to be an outline to work.
if (glyph->format == FT_GLYPH_FORMAT_OUTLINE)
{
// Render the outline spans to the span list
FT_Outline *o = &reinterpret_cast<FT_OutlineGlyph>(glyph)->outline;
RenderSpans(mLibrary, o, &outlineSpans);
}
// Clean up afterwards.
FT_Stroker_Done(stroker);
FT_Done_Glyph(glyph);
// Now we need to put it all together.
if (!spans.empty())
{
// Figure out what the bounding rect is for both the span lists.
Rect rect(spans.front().x, spans.front().y, spans.front().x, spans.front().y);
for (Spans::iterator s = spans.begin(); s != spans.end(); ++s)
{
rect.Include(Vec2(s->x, s->y));
rect.Include(Vec2(s->x + s->width - 1, s->y));
}
for (Spans::iterator s = outlineSpans.begin(); s != outlineSpans.end(); ++s)
{
rect.Include(Vec2(s->x, s->y));
rect.Include(Vec2(s->x + s->width - 1, s->y));
}
float bearingX = slot->metrics.horiBearingX >> 6;
float bearingY = slot->metrics.horiBearingY >> 6;
float advance = slot->advance.x >> 6;
// Allocate data for our image and clear it out to transparent.
// Pixel32 *pxl = new Pixel32[imgSize];
// memset(pxl, 0, sizeof(Pixel32) * imgSize);
offsetY = ((bbox.yMax - bbox.yMin) - ((glyph_bbox.yMax - glyph_bbox.yMin))) / 2;
// offsetY = ((bbox.yMax) - (glyph_bbox.yMax >> 6)) / 2;
// Loop over the outline spans and just draw them into the
// image.
for (Spans::iterator s = outlineSpans.begin(); s != outlineSpans.end(); ++s)
{
for (int w = 0; w < s->width; ++w)
{
// int row = (imgHeight - 1 - (s->y - rect.ymin)) - imgHeight + (rect.ymax - rect.ymin);
// int row = (imgHeight - 1 - (s->y - rect.ymin));
int row = (bbox.yMax - bbox.yMin) - (s->y - rect.ymin) + _org.y - offsetY;
// int row = ((bbox.yMax - bbox.yMin) - (glyph_bbox.yMax - glyph_bbox.yMin)) / 2 - (s->y - rect.ymin) + _org.y;
// mat.at<Vec3b>((imgHeight - 1 - (s->y - rect.ymin)), s->x - rect.xmin + w) = outlineColor;
mat.at<Vec3b>(row, s->x - rect.xmin + w + _org.x + bearingX) = outlineColor;
// mat.at<Vec3b>(-(s->y - rect.ymin), s->x - rect.xmin + w) = outlineColor;
// vec3b.
/*
pxl[(int)((imgHeight - 1 - (s->y - rect.ymin)) * imgWidth
+ s->x - rect.xmin + w)] =
Pixel32(outlineCol.r, outlineCol.g, outlineCol.b,
s->coverage);
*/
}
}
// Then loop over the regular glyph spans and blend them into
// the image.
for (Spans::iterator s = spans.begin(); s != spans.end(); ++s)
{
for (int w = 0; w < s->width; ++w)
{
// int row = (imgHeight - 1 - (s->y - rect.ymin)) - imgHeight + (rect.ymax - rect.ymin);
int row = (bbox.yMax - bbox.yMin) - (s->y - rect.ymin) + _org.y - offsetY;
// int row = ((bbox.yMax - bbox.yMin) - (glyph_bbox.yMax - glyph_bbox.yMin)) / 2 - (s->y - rect.ymin) + _org.y;
mat.at<Vec3b>(row, s->x - rect.xmin + w + _org.x + bearingX) = fontColor;
// mat.at<Vec3b>(-(s->y - rect.ymin), s->x - rect.xmin + w) = fontColor;
#if 0
Pixel32 &dst =
pxl[(int)(
(imgHeight - 1 - (s->y - rect.ymin)) * imgWidth
+ s->x - rect.xmin + w)];
Pixel32 src = Pixel32(fontCol.r, fontCol.g, fontCol.b,
s->coverage);
dst.r = (int)(dst.r + ((src.r - dst.r) * src.a) / 255.0f);
dst.g = (int)(dst.g + ((src.g - dst.g) * src.a) / 255.0f);
dst.b = (int)(dst.b + ((src.b - dst.b) * src.a) / 255.0f);
dst.a = MIN(255, dst.a + src.a);
#endif
}
}
}
}
#if 0
// This is unused in this test but you would need this to draw
// more than one glyph.
float bearingX = face->glyph->metrics.horiBearingX >> 6;
float bearingY = face->glyph->metrics.horiBearingY >> 6;
#endif
// Update current position ( in FreeType coordinates )
float advance = mFace->glyph->advance.x >> 6;
currentPos.x += mFace->glyph->advance.x >> 6;
currentPos.y += mFace->glyph->advance.y >> 6;
// currentPos.x += mFace->glyph->metrics.horiBearingX >> 6;
// currentPos.y += mFace->glyph->metrics.horiBearingY >> 6;
// currentPos.x += mFace->glyph->metrics.horiBearingX;
// currentPos.y += mFace->glyph->metrics.horiBearingY;
// break;
_org.x += mFace->glyph->advance.x >> 6;
_org.y += mFace->glyph->advance.y >> 6;
}
#if defined(USING_HB)
hb_buffer_destroy(hb_buffer);
#endif 0
@ -614,6 +938,14 @@ namespace cv {
CV_Assert(!FT_Load_Glyph(mFace, info[i].codepoint, 0));
#else
for (unsigned int i = 0; i < wstr.size(); i++) {
if (wstr[i] == '\r' || wstr[i] == '\n')
{
// xMin = cv::min(xMin, ftd(bbox.xMin));
// xMax = cv::max(xMax, ftd(bbox.xMax));
// yMin = cv::min(yMin, ftd(bbox.yMin));
// yMax = cv::max(yMax, currentPos.y + (mFace->glyph->advance.y));
continue;
}
CV_Assert(!FT_Load_Glyph(mFace, FT_Get_Char_Index(mFace, wstr[i]), 0));
#endif
FT_GlyphSlot slot = mFace->glyph;
@ -625,9 +957,7 @@ namespace cv {
FT_Outline_Transform(&outline, &mtx);
// Move to current position ( in FreeType coordinates )
FT_Outline_Translate(&outline,
currentPos.x,
currentPos.y);
FT_Outline_Translate(&outline, currentPos.x, currentPos.y);
// Get BoundaryBox ( in FreeType coordinatrs )
CV_Assert(!FT_Outline_Get_BBox(&outline, &bbox));
@ -637,7 +967,8 @@ namespace cv {
if (
(bbox.xMin == 0) && (bbox.xMax == 0) &&
(bbox.yMin == 0) && (bbox.yMax == 0)
) {
)
{
bbox.xMin = currentPos.x;
bbox.xMax = currentPos.x + (mFace->glyph->advance.x);
bbox.yMin = yMin;

15
app/src/main/cpp/CvText.h
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@ -13,8 +13,7 @@
namespace cv {
namespace ft {
using cv::String;
// using cv::CV_Assert;
class FreeType2 : public Algorithm
{
@ -54,11 +53,8 @@ namespace cv {
@param bottomLeftOrigin When true, the image data origin is at the bottom-left corner. Otherwise, it is at the top-left corner.
*/
virtual void putText(
InputOutputArray img, const String& text, Point org,
int fontHeight, Scalar color,
int thickness, int line_type, bool bottomLeftOrigin
) = 0;
virtual void putText(InputOutputArray img, const String& text, Point org, int fontHeight, Scalar color, int thickness, int line_type, bool bottomLeftOrigin) = 0;
/** @brief Calculates the width and height of a text string.
@ -115,9 +111,8 @@ namespace cv {
@see cv::putText
*/
virtual Size getTextSize(const String& text,
int fontHeight, int thickness,
CV_OUT int* baseLine) = 0;
virtual Size getTextSize(const String& text, int fontHeight, int thickness, CV_OUT int* baseLine) = 0;
};

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