bool GiCanvasIos::drawImage(CGImageRef image, const Point2d& centerM, bool autoScale)
{
CGContextRef context = m_draw->getContext();
bool ret = false;
if (context && image) {
Point2d ptD = centerM * m_draw->xf().modelToDisplay();
float w = CGImageGetWidth(image);
float h = CGImageGetHeight(image);
if (autoScale) {
w *= m_draw->xf().getViewScale();
h *= m_draw->xf().getViewScale();
}
CGAffineTransform af = CGAffineTransformMake(1, 0, 0, -1, 0, m_draw->height());
af = CGAffineTransformTranslate(af, ptD.x - w * 0.5f,
m_draw->height() - (ptD.y + h * 0.5f));
CGContextConcatCTM(context, af);
CGContextDrawImage(context, CGRectMake(0, 0, w, h), image);
CGContextConcatCTM(context, CGAffineTransformInvert(af));
ret = true;
}
return ret;
}
void GiCanvasIos::endPaint(bool draw)
{
if (m_draw->getContext())
{
if (draw && m_draw->_buffctx && m_draw->_context) {
CGContextRef context = m_draw->_context;
CGImageRef image = CGBitmapContextCreateImage(m_draw->_buffctx);
CGRect rect = CGRectMake(0, 0, m_draw->width(), m_draw->height()); // 逻辑宽高点数
if (image) {
CGAffineTransform af = CGAffineTransformMake(1, 0, 0, -1, 0, m_draw->height());
CGContextConcatCTM(context, af); // 图像是朝上的，上下文坐标系朝下，上下颠倒显示
CGInterpolationQuality old = CGContextGetInterpolationQuality(context);
CGContextSetInterpolationQuality(context, kCGInterpolationNone);
CGContextDrawImage(context, rect, image);
CGContextSetInterpolationQuality(context, old);
CGContextConcatCTM(context, CGAffineTransformInvert(af)); // 恢复成坐标系朝下
CGImageRelease(image);
}
}
if (m_draw->_buffctx) {
CGContextRelease(m_draw->_buffctx);
m_draw->_buffctx = NULL;
}
m_draw->_context = NULL;
if (owner())
owner()->_endPaint();
}
}
bool GiCanvasIos::drawCachedBitmap2(const GiCanvas* p, float x, float y, bool secondBmp)
{
bool ret = false;
if (p && p->getCanvasType() == getCanvasType()) {
GiCanvasIos* gs = (GiCanvasIos*)p;
int index = secondBmp ? 1 : 0;
CGImageRef image = gs->m_draw->_cacheserr[index] ? NULL : gs->m_draw->_caches[index];
CGContextRef context = m_draw->getContext();
if (context && image) {
CGRect rect = CGRectMake(x, y, m_draw->width(), m_draw->height());
CGAffineTransform af = CGAffineTransformMake(1, 0, 0, -1, 0, m_draw->height());
CGContextConcatCTM(context, af);
CGInterpolationQuality oldQuality = CGContextGetInterpolationQuality(context);
CGContextSetInterpolationQuality(context, kCGInterpolationNone);
CGContextDrawImage(context, rect, image);
CGContextSetInterpolationQuality(context, oldQuality);
CGContextConcatCTM(context, CGAffineTransformInvert(af));
ret = true;
}
}
return ret;
}
CGImageRef GiCanvasIos::cachedBitmap(bool invert)
{
CGImageRef image = m_draw->_caches[0];
if (!image || !invert)
return image; // 调用者不能释放图像
size_t w = CGImageGetWidth(image); // 图像宽度，像素单位，不是点单位
size_t h = CGImageGetHeight(image);
CGImageRef newimg = NULL;
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
CGContextRef context = CGBitmapContextCreate(NULL, w, h, 8, w * 4,
colorSpace, kCGImageAlphaPremultipliedLast);
CGColorSpaceRelease(colorSpace);
if (context) {
CGAffineTransform af = CGAffineTransformMake(1, 0, 0, -1, 0, h);
CGContextConcatCTM(context, af); // 图像是朝上的，上下文坐标系朝下，上下颠倒显示
CGContextDrawImage(context, CGRectMake(0, 0, w, h), image);
CGContextConcatCTM(context, CGAffineTransformInvert(af));
newimg = CGBitmapContextCreateImage(context); // 得到上下颠倒的新图像
CGContextRelease(context);
}
return newimg; // 由调用者释放图像, CGImageRelease
}
void wkSetPatternPhaseInUserSpace(CGContextRef context, CGPoint phasePoint)
{
CGAffineTransform userToBase = CGAffineTransformConcat(CGContextGetCTM(context),
CGAffineTransformInvert(CGContextGetBaseCTM(context)));
CGPoint phase = CGPointApplyAffineTransform(phasePoint, userToBase);
CGContextSetPatternPhase(context, CGSizeMake(phase.x, phase.y));
}
JNIEXPORT void JNICALL OS_NATIVE(CGAffineTransformInvert)
(JNIEnv *env, jclass that, jfloatArray arg0, jfloatArray arg1)
{
jfloat *lparg0=NULL;
jfloat *lparg1=NULL;
OS_NATIVE_ENTER(env, that, CGAffineTransformInvert_FUNC);
if (arg0) if ((lparg0 = (*env)->GetFloatArrayElements(env, arg0, NULL)) == NULL) goto fail;
if (arg1) if ((lparg1 = (*env)->GetFloatArrayElements(env, arg1, NULL)) == NULL) goto fail;
*(CGAffineTransform *)lparg1 = CGAffineTransformInvert(*(CGAffineTransform *)lparg0);
fail:
if (arg1 && lparg1) (*env)->ReleaseFloatArrayElements(env, arg1, lparg1, 0);
if (arg0 && lparg0) (*env)->ReleaseFloatArrayElements(env, arg0, lparg0, JNI_ABORT);
OS_NATIVE_EXIT(env, that, CGAffineTransformInvert_FUNC);
}
CFX_QuartzDeviceDriver::CFX_QuartzDeviceDriver(CGContextRef context, FX_INT32 deviceClass)
{
m_saveCount = 0;
_context = context;
_deviceClass = deviceClass;
CGContextRetain(_context);
CGRect r = CGContextGetClipBoundingBox(context);
_width = FXSYS_round(r.size.width);
_height = FXSYS_round(r.size.height);
_renderCaps = FXRC_SOFT_CLIP | FXRC_BLEND_MODE |
FXRC_ALPHA_PATH | FXRC_ALPHA_IMAGE |
FXRC_BIT_MASK | FXRC_ALPHA_MASK;
if (_deviceClass != FXDC_DISPLAY) {
} else {
CGImageRef image = CGBitmapContextCreateImage(_context);
if (image) {
_renderCaps |= FXRC_GET_BITS;
_width = CGImageGetWidth(image);
_height = CGImageGetHeight(image);
CGImageAlphaInfo alphaInfo = CGImageGetAlphaInfo(image);
if (kCGImageAlphaPremultipliedFirst == alphaInfo ||
kCGImageAlphaPremultipliedLast == alphaInfo ||
kCGImageAlphaOnly == alphaInfo) {
_renderCaps |= FXRC_ALPHA_OUTPUT;
}
}
CGImageRelease(image);
}
CGAffineTransform ctm = CGContextGetCTM(_context);
CGContextSaveGState(_context);
m_saveCount++;
if (ctm.d >= 0) {
CGFloat offset_x, offset_y;
offset_x = ctm.tx;
offset_y = ctm.ty;
CGContextTranslateCTM(_context, -offset_x, -offset_y);
CGContextConcatCTM(_context, CGAffineTransformMake(1, 0, 0, -1, offset_x, _height + offset_y));
}
_foxitDevice2User = CGAffineTransformIdentity;
_user2FoxitDevice = CGAffineTransformInvert(_foxitDevice2User);
}
bool GiCanvasIos::drawImage(CGImageRef image, const Box2d& rectM)
{
CGContextRef context = m_draw->getContext();
bool ret = false;
if (context && image) {
Point2d ptD = rectM.center() * m_draw->xf().modelToDisplay();
Box2d rect = rectM * m_draw->xf().modelToDisplay();
CGAffineTransform af = CGAffineTransformMake(1, 0, 0, -1, 0, m_draw->height());
af = CGAffineTransformTranslate(af, ptD.x - rect.width() * 0.5f,
m_draw->height() - (ptD.y + rect.height() * 0.5f));
CGContextConcatCTM(context, af);
CGContextDrawImage(context, CGRectMake(0, 0, rect.width(), rect.height()), image);
CGContextConcatCTM(context, CGAffineTransformInvert(af));
ret = true;
}
return ret;
}
bool GiCanvasIos::drawCachedBitmap(float x, float y, bool secondBmp)
{
int index = secondBmp ? 1 : 0;
CGImageRef image = m_draw->_cacheserr[index] ? NULL : m_draw->_caches[index];
CGContextRef context = m_draw->getContext();
bool ret = false;
if (context && image) {
CGRect rect = CGRectMake(x, y, m_draw->width(), m_draw->height());
CGAffineTransform af = CGAffineTransformMake(1, 0, 0, -1, 0, m_draw->height());
CGContextConcatCTM(context, af); // 图像是朝上的，上下文坐标系朝下，上下颠倒显示
CGInterpolationQuality oldQuality = CGContextGetInterpolationQuality(context);
CGContextSetInterpolationQuality(context, kCGInterpolationNone);
CGContextDrawImage(context, rect, image);
CGContextSetInterpolationQuality(context, oldQuality);
CGContextConcatCTM(context, CGAffineTransformInvert(af)); // 恢复成坐标系朝下
ret = true;
}
return ret;
}
void EJPath::arcTo(float x1, float y1, float x2, float y2, float radius) {
// Lifted from http://code.google.com/p/fxcanvas/
// I have no idea what this code is doing, but it seems to work.
// get untransformed currentPos
EJVector2 cp = EJVector2ApplyTransform(currentPos, CGAffineTransformInvert(transform));
float a1 = cp.y - y1;
float b1 = cp.x - x1;
float a2 = y2 - y1;
float b2 = x2 - x1;
float mm = fabsf(a1 * b2 - b1 * a2);
if( mm < 1.0e-8 || radius == 0 ) {
lineTo(x1, y1);
}
else {
float dd = a1 * a1 + b1 * b1;
float cc = a2 * a2 + b2 * b2;
float tt = a1 * a2 + b1 * b2;
float k1 = radius * sqrtf(dd) / mm;
float k2 = radius * sqrtf(cc) / mm;
float j1 = k1 * tt / dd;
float j2 = k2 * tt / cc;
float cx = k1 * b2 + k2 * b1;
float cy = k1 * a2 + k2 * a1;
float px = b1 * (k2 + j1);
float py = a1 * (k2 + j1);
float qx = b2 * (k1 + j2);
float qy = a2 * (k1 + j2);
float startAngle = atan2f(py - cy, px - cx);
float endAngle = atan2f(qy - cy, qx - cx);
arc(cx + x1, cy + y1, radius, startAngle, endAngle, (b1 * a2 > b2 * a1));
}
}
AffineTransform AffineTransform::invert() const
{
if (isInvertible())
return AffineTransform(CGAffineTransformInvert(m_transform));
return AffineTransform();
}
Transform2D Transform2D::invert() const
{
return CGAffineTransformInvert(*this);
}
static cairo_int_status_t
_cairo_quartz_init_glyph_metrics (cairo_quartz_scaled_font_t *font,
cairo_scaled_glyph_t *scaled_glyph)
{
cairo_int_status_t status = CAIRO_STATUS_SUCCESS;
cairo_quartz_font_face_t *font_face = _cairo_quartz_scaled_to_face(font);
cairo_text_extents_t extents = {0, 0, 0, 0, 0, 0};
CGGlyph glyph = _cairo_quartz_scaled_glyph_index (scaled_glyph);
int advance;
CGRect bbox;
double emscale = CGFontGetUnitsPerEmPtr (font_face->cgFont);
double xmin, ymin, xmax, ymax;
if (glyph == INVALID_GLYPH)
goto FAIL;
if (!CGFontGetGlyphAdvancesPtr (font_face->cgFont, &glyph, 1, &advance) ||
!CGFontGetGlyphBBoxesPtr (font_face->cgFont, &glyph, 1, &bbox))
goto FAIL;
/* broken fonts like Al Bayan return incorrect bounds for some null characters,
see https://bugzilla.mozilla.org/show_bug.cgi?id=534260 */
if (unlikely (bbox.origin.x == -32767 &&
bbox.origin.y == -32767 &&
bbox.size.width == 65534 &&
bbox.size.height == 65534)) {
bbox.origin.x = bbox.origin.y = 0;
bbox.size.width = bbox.size.height = 0;
}
bbox = CGRectMake (bbox.origin.x / emscale,
bbox.origin.y / emscale,
bbox.size.width / emscale,
bbox.size.height / emscale);
/* Should we want to always integer-align glyph extents, we can do so in this way */
#if 0
{
CGAffineTransform textMatrix;
textMatrix = CGAffineTransformMake (font->base.scale.xx,
-font->base.scale.yx,
-font->base.scale.xy,
font->base.scale.yy,
0.0f, 0.0f);
bbox = CGRectApplyAffineTransform (bbox, textMatrix);
bbox = CGRectIntegral (bbox);
bbox = CGRectApplyAffineTransform (bbox, CGAffineTransformInvert (textMatrix));
}
#endif
#if 0
fprintf (stderr, "[0x%04x] bbox: %f %f %f %f\n", glyph,
bbox.origin.x / emscale, bbox.origin.y / emscale,
bbox.size.width / emscale, bbox.size.height / emscale);
#endif
xmin = CGRectGetMinX(bbox);
ymin = CGRectGetMinY(bbox);
xmax = CGRectGetMaxX(bbox);
ymax = CGRectGetMaxY(bbox);
extents.x_bearing = xmin;
extents.y_bearing = - ymax;
extents.width = xmax - xmin;
extents.height = ymax - ymin;
extents.x_advance = (double) advance / emscale;
extents.y_advance = 0.0;
#if 0
fprintf (stderr, "[0x%04x] extents: bearings: %f %f dim: %f %f adv: %f\n\n", glyph,
extents.x_bearing, extents.y_bearing, extents.width, extents.height, extents.x_advance);
#endif
FAIL:
_cairo_scaled_glyph_set_metrics (scaled_glyph,
&font->base,
&extents);
return status;
}
static cairo_int_status_t
_cairo_quartz_init_glyph_metrics (cairo_quartz_scaled_font_t *font,
cairo_scaled_glyph_t *scaled_glyph)
{
cairo_int_status_t status = CAIRO_STATUS_SUCCESS;
cairo_quartz_font_face_t *font_face = _cairo_quartz_scaled_to_face(font);
cairo_text_extents_t extents = {0, 0, 0, 0, 0, 0};
CGAffineTransform textMatrix;
CGGlyph glyph = _cairo_quartz_scaled_glyph_index (scaled_glyph);
int advance;
CGRect bbox;
double emscale = CGFontGetUnitsPerEmPtr (font_face->cgFont);
double xscale, yscale;
double xmin, ymin, xmax, ymax;
if (glyph == INVALID_GLYPH)
goto FAIL;
if (!CGFontGetGlyphAdvancesPtr (font_face->cgFont, &glyph, 1, &advance) ||
!CGFontGetGlyphBBoxesPtr (font_face->cgFont, &glyph, 1, &bbox))
goto FAIL;
status = _cairo_matrix_compute_basis_scale_factors (&font->base.scale,
&xscale, &yscale, 1);
if (status)
goto FAIL;
bbox = CGRectMake (bbox.origin.x / emscale,
bbox.origin.y / emscale,
bbox.size.width / emscale,
bbox.size.height / emscale);
/* Should we want to always integer-align glyph extents, we can do so in this way */
#if 0
{
CGAffineTransform textMatrix;
textMatrix = CGAffineTransformMake (font->base.scale.xx,
-font->base.scale.yx,
-font->base.scale.xy,
font->base.scale.yy,
0.0f, 0.0f);
bbox = CGRectApplyAffineTransform (bbox, textMatrix);
bbox = CGRectIntegral (bbox);
bbox = CGRectApplyAffineTransform (bbox, CGAffineTransformInvert (textMatrix));
}
#endif
#if 0
fprintf (stderr, "[0x%04x] bbox: %f %f %f %f\n", glyph,
bbox.origin.x / emscale, bbox.origin.y / emscale,
bbox.size.width / emscale, bbox.size.height / emscale);
#endif
xmin = CGRectGetMinX(bbox);
ymin = CGRectGetMinY(bbox);
xmax = CGRectGetMaxX(bbox);
ymax = CGRectGetMaxY(bbox);
extents.x_bearing = xmin;
extents.y_bearing = - ymax;
extents.width = xmax - xmin;
extents.height = ymax - ymin;
extents.x_advance = (double) advance / emscale;
extents.y_advance = 0.0;
#if 0
fprintf (stderr, "[0x%04x] extents: bearings: %f %f dim: %f %f adv: %f\n\n", glyph,
extents.x_bearing, extents.y_bearing, extents.width, extents.height, extents.x_advance);
#endif
FAIL:
_cairo_scaled_glyph_set_metrics (scaled_glyph,
&font->base,
&extents);
return status;
}
FX_BOOL CFX_QuartzDeviceDriver::CG_DrawGlypRun(int nChars,
const FXTEXT_CHARPOS* pCharPos,
CFX_Font* pFont,
CFX_FontCache* pCache,
const CFX_AffineMatrix* pGlyphMatrix,
const CFX_AffineMatrix* pObject2Device,
FX_FLOAT font_size,
FX_DWORD argb,
int alpha_flag,
void* pIccTransform)
{
if (nChars == 0) {
return TRUE;
}
CQuartz2D& quartz2d = ((CApplePlatform *) CFX_GEModule::Get()->GetPlatformData())->_quartz2d;
if (!pFont->m_pPlatformFont) {
if (pFont->GetPsName() == CFX_WideString::FromLocal("DFHeiStd-W5")) {
return FALSE;
}
pFont->m_pPlatformFont = quartz2d.CreateFont(pFont->m_pFontData, pFont->m_dwSize);
if (NULL == pFont->m_pPlatformFont) {
return FALSE;
}
}
CFX_FixedBufGrow<FX_WORD, 32> glyph_indices(nChars);
CFX_FixedBufGrow<CGPoint, 32> glyph_positions(nChars);
for (int i = 0; i < nChars; i++ ) {
glyph_indices[i] = pCharPos[i].m_ExtGID;
glyph_positions[i].x = pCharPos[i].m_OriginX;
glyph_positions[i].y = pCharPos[i].m_OriginY;
}
CFX_AffineMatrix text_matrix;
if (pObject2Device) {
text_matrix.Concat(*pObject2Device);
}
CGAffineTransform matrix_cg = CGAffineTransformMake(text_matrix.a,
text_matrix.b,
text_matrix.c,
text_matrix.d,
text_matrix.e,
text_matrix.f);
matrix_cg = CGAffineTransformConcat(matrix_cg, _foxitDevice2User);
CGContextSetTextMatrix(_context, matrix_cg);
CGContextSetFont(_context, (CGFontRef)pFont->m_pPlatformFont);
CGContextSetFontSize(_context, FXSYS_fabs(font_size));
FX_INT32 a, r, g, b;
ArgbDecode(argb, a, r, g, b);
CGContextSetRGBFillColor(_context,
r / 255.f,
g / 255.f,
b / 255.f,
a / 255.f);
SaveState();
if (pGlyphMatrix) {
CGPoint origin = CGPointMake( glyph_positions[0].x, glyph_positions[0].y);
origin = CGPointApplyAffineTransform(origin, matrix_cg);
CGContextTranslateCTM(_context, origin.x, origin.y);
CGAffineTransform glyph_matrix = CGAffineTransformMake(pGlyphMatrix->a,
pGlyphMatrix->b,
pGlyphMatrix->c,
pGlyphMatrix->d,
pGlyphMatrix->e,
pGlyphMatrix->f);
if (_foxitDevice2User.d < 0) {
glyph_matrix = CGAffineTransformInvert(glyph_matrix);
}
CGContextConcatCTM(_context, glyph_matrix);
CGContextTranslateCTM(_context, -origin.x, -origin.y);
}
CGContextShowGlyphsAtPositions(_context,
(CGGlyph*)glyph_indices,
glyph_positions,
nChars);
RestoreState(FALSE);
return TRUE;
}
void EJPath::drawLinesToContext(EJCanvasContext * context) {
endSubPath();
EJCanvasState * state = context->state;
EJVector2 vecZero = { 0.0f, 0.0f };
// Find the width of the line as it is projected onto the screen.
float projectedLineWidth = CGAffineTransformGetScale( state->transform ) * state->lineWidth;
context->setTexture(NULL);
// Figure out if we need to add line caps and set the cap texture coord for square or round caps.
// For thin lines we disable texturing and line caps.
float width2 = state->lineWidth/2;
BOOL addCaps = (projectedLineWidth > 2 && (state->lineCap == kEJLineCapRound || state->lineCap == kEJLineCapSquare));
// The miter limit is the maximum allowed ratio of the miter length to half the line width.
BOOL addMiter = (state->lineJoin == kEJLineJoinMiter);
float miterLimit = (state->miterLimit * width2);
EJColorRGBA color = state->strokeColor;
color.rgba.a = (unsigned char)(color.rgba.a * state->globalAlpha);
// Enable stencil test when drawing transparent lines.
// Cycle through all bits, so that the stencil buffer only has to be cleared after eight stroke operations
if( color.rgba.a < 0xff ) {
context->flushBuffers();
context->createStencilBufferOnce();
glEnable(GL_STENCIL_TEST);
glStencilMask(stencilMask);
glStencilOp(GL_KEEP, GL_KEEP, GL_REPLACE);
glStencilFunc(GL_NOTEQUAL, stencilMask, stencilMask);
}
// To draw the line correctly with transformations, we need to construct the line
// vertices from the untransformed points and only apply the transformation in
// the last step (pushQuad) again.
CGAffineTransform inverseTransform = CGAffineTransformIsIdentity(transform)
? transform
: CGAffineTransformInvert(transform);
// Oh god, I'm so sorry... This code sucks quite a bit. I'd be surprised if I
// will understand what I've written in 3 days :/
// Calculating line miters for potentially closed paths is serious business!
// And it doesn't even handle all the edge cases.
EJVector2
*transCurrent, *transNext, // Pointers to current and next vertices on the line
current, next, // Untransformed current and next points
firstMiter1, firstMiter2, // First miter vertices (left, right) needed for closed paths
miter11, miter12, // Current miter vertices (left, right)
miter21, miter22, // Next miter vertices (left, right)
currentEdge, currentExt, // Current edge and its normal * width/2
nextEdge = { 0.0f, 0.0f }, nextExt = { 0.0f, 0.0f }; // Next edge and its normal * width/2
for( path_t::iterator sp = paths.begin(); sp != paths.end(); ++sp ) {
BOOL subPathIsClosed = sp->isClosed;
BOOL ignoreFirstSegment = addMiter && subPathIsClosed;
BOOL firstInSubPath = true;
BOOL miterLimitExceeded = false, firstMiterLimitExceeded = false;
transCurrent = transNext = NULL;
// If this subpath is closed, initialize the first vertex for the loop ("next")
// to the last vertex in the subpath. This way, the miter between the last and
// the first segment will be computed and used to draw the first segment's first
// miter, as well as the last segment's last miter outside the loop.
if( addMiter && subPathIsClosed ) {
transNext = &sp->points.at(sp->points.size()-2);
next = EJVector2ApplyTransform( *transNext, inverseTransform );
}
for( points_t::iterator vertex = sp->points.begin(); vertex != sp->points.end(); ++vertex) {
transCurrent = transNext;
transNext = &(*vertex);
current = next;
next = EJVector2ApplyTransform( *transNext, inverseTransform );
if( !transCurrent ) {
continue;
}
currentEdge = nextEdge;
currentExt = nextExt;
nextEdge = EJVector2Normalize(EJVector2Sub(next, current));
nextExt = EJVector2Make( -nextEdge.y * width2, nextEdge.x * width2 );
if( firstInSubPath ) {
firstMiter1 = miter21 = EJVector2Add( current, nextExt );
firstMiter2 = miter22 = EJVector2Sub( current, nextExt );
firstInSubPath = false;
// Start cap
if( addCaps && !subPathIsClosed ) {
if( state->lineCap == kEJLineCapSquare ) {
EJVector2 capExt = { -nextExt.y, nextExt.x };
EJVector2 cap11 = EJVector2Add( miter21, capExt );
EJVector2 cap12 = EJVector2Add( miter22, capExt );
context->
pushQuad(cap11 ,cap12 ,miter21 ,miter22
,vecZero ,vecZero ,vecZero ,vecZero
,color ,transform);
}
else {
drawArcToContext(context, current, miter22, miter21, color);
}
}
continue;
}
miter11 = miter21;
miter12 = miter22;
BOOL miterAdded = false;
if( addMiter ) {
EJVector2 miterEdge = EJVector2Add( currentEdge, nextEdge );
float miterExt = (1/EJVector2Dot(miterEdge, miterEdge)) * state->lineWidth;
if( miterExt < miterLimit ) {
miterEdge.x *= miterExt;
miterEdge.y *= miterExt;
miter21 = EJVector2Make( current.x - miterEdge.y, current.y + miterEdge.x );
miter22 = EJVector2Make( current.x + miterEdge.y, current.y - miterEdge.x );
miterAdded = true;
miterLimitExceeded = false;
}
else {
miterLimitExceeded = true;
}
}
// No miter added? Calculate the butt for the current segment
if( !miterAdded ) {
miter21 = EJVector2Add(current, currentExt);
miter22 = EJVector2Sub(current, currentExt);
}
if( ignoreFirstSegment ) {
// True when starting from the back vertex of a closed path. This run was just
// to calculate the first miter.
firstMiter1 = miter21;
firstMiter2 = miter22;
if( !miterAdded ) {
// Flip miter21 <> miter22 if it's the butt for the first segment
miter21 = firstMiter2;
miter22 = firstMiter1;
}
firstMiterLimitExceeded = miterLimitExceeded;
ignoreFirstSegment = false;
continue;
}
if( !addMiter || miterLimitExceeded ) {
// previous point can be approximated, good enough for distance comparison
EJVector2 prev = EJVector2Sub(current, currentEdge);
EJVector2 p1, p2;
float d1, d2;
// calculate points to use for bevel
// two points are possible for each edge - the one farthest away from the other line has to be used
// calculate point for current edge
d1 = EJDistanceToLineSegmentSquared(miter21, current, next);
d2 = EJDistanceToLineSegmentSquared(miter22, current, next);
p1 = ( d1 > d2 ) ? miter21 : miter22;
// calculate point for next edge
d1 = EJDistanceToLineSegmentSquared(EJVector2Add(current, nextExt), current, prev);
d2 = EJDistanceToLineSegmentSquared(EJVector2Sub(current, nextExt), current, prev);
p2 = ( d1 > d2 ) ? EJVector2Add(current, nextExt) : EJVector2Sub(current, nextExt);
if( state->lineJoin==kEJLineJoinRound ) {
drawArcToContext(context, current, p1, p2, color);
}
else {
context->
pushTri(p1.x ,p1.y ,current.x,current.y ,p2.x ,p2.y
,color ,transform);
}
}
context->
pushQuad(miter11 ,miter12 ,miter21 ,miter22
,vecZero ,vecZero ,vecZero ,vecZero
,color ,transform);
// No miter added? The "miter" for the next segment needs to be the butt for the next segment,
// not the butt for the current one.
if( !miterAdded ) {
miter21 = EJVector2Add(current, nextExt);
miter22 = EJVector2Sub(current, nextExt);
}
} // for each subpath
// The last segment, not handled in the loop
if( !firstMiterLimitExceeded && addMiter && subPathIsClosed ) {
miter11 = firstMiter1;
miter12 = firstMiter2;
}
else {
EJVector2 untransformedBack = EJVector2ApplyTransform(sp->points.back(), inverseTransform);
miter11 = EJVector2Add(untransformedBack, nextExt);
miter12 = EJVector2Sub(untransformedBack, nextExt);
}
if( (!addMiter || firstMiterLimitExceeded) && subPathIsClosed ) {
float d1,d2;
EJVector2 p1,p2,
firstNormal = EJVector2Sub(firstMiter1,firstMiter2), // unnormalized line normal for first edge
second = EJVector2Add(next,EJVector2Make(firstNormal.y,-firstNormal.x)); // approximated second point
// calculate points to use for bevel
// two points are possible for each edge - the one farthest away from the other line has to be used
// calculate point for current edge
d1 = EJDistanceToLineSegmentSquared(miter12, next, second);
d2 = EJDistanceToLineSegmentSquared(miter11, next, second);
p2 = ( d1 > d2 )?miter12:miter11;
// calculate point for next edge
d1 = EJDistanceToLineSegmentSquared(firstMiter1, current, next);
d2 = EJDistanceToLineSegmentSquared(firstMiter2, current, next);
p1 = (d1>d2)?firstMiter1:firstMiter2;
if( state->lineJoin==kEJLineJoinRound ) {
drawArcToContext(context, next, p1, p2, color);
}
else {
context->
pushTri(p1.x ,p1.y ,next.x ,next.y ,p2.x,p2.y
,color ,transform);
}
}
context->
pushQuad(miter11,miter12,miter21,miter22
,vecZero ,vecZero ,vecZero ,vecZero
,color ,transform);
// End cap
if( addCaps && !subPathIsClosed ) {
if( state->lineCap == kEJLineCapSquare ) {
EJVector2 capExt = { nextExt.y, -nextExt.x };
EJVector2 cap11 = EJVector2Add( miter11, capExt );
EJVector2 cap12 = EJVector2Add( miter12, capExt );
context->
pushQuad(cap11,cap12,miter11,miter12
,vecZero,vecZero,vecZero ,vecZero
,color ,transform);
}
else {
drawArcToContext(context, next, miter11, miter12, color);
}
}
} // for each path
// disable stencil test when drawing transparent lines
if( color.rgba.a < 0xff ) {
context->flushBuffers();
glDisable(GL_STENCIL_TEST);
if( stencilMask == (1<<7) ) {
stencilMask = (1<<0);
glStencilMask(0xff);
glClearStencil(0x0);
glClear(GL_STENCIL_BUFFER_BIT);
}
else {
stencilMask <<= 1;
}
}
}