From b1125f8daf52c750f6b642a343195c70f47f49f1 Mon Sep 17 00:00:00 2001 From: weili Date: Mon, 12 Dec 2016 10:21:19 -0800 Subject: Fix dotted line drawing for GDI device driver When GDI device driver draws a dotted line, it also clip the line into the device context's bound before drawing. This CL includes a couple fixes: -- When this driver is used for EMF drawing, the drawing is not bound to the device context so clipping is not needed; -- Transformation needs to be applied before clipping since the transformation may move the line into the bound; -- While checking for out-of-bound flags, bit operations are needed to make sure the discarded line is completely out of bound, not partially inside the bound; BUG=chromium:539533 Review-Url: https://codereview.chromium.org/2562533002 --- core/fxge/win32/fx_win32_device.cpp | 74 ++++++++++++++++++++----------------- core/fxge/win32/win32_int.h | 7 +--- 2 files changed, 42 insertions(+), 39 deletions(-) (limited to 'core/fxge/win32') diff --git a/core/fxge/win32/fx_win32_device.cpp b/core/fxge/win32/fx_win32_device.cpp index e0d2e60a15..2746587be2 100644 --- a/core/fxge/win32/fx_win32_device.cpp +++ b/core/fxge/win32/fx_win32_device.cpp @@ -738,7 +738,9 @@ CGdiDeviceDriver::CGdiDeviceDriver(HDC hDC, int device_class) { CWin32Platform* pPlatform = (CWin32Platform*)CFX_GEModule::Get()->GetPlatformData(); SetStretchBltMode(hDC, pPlatform->m_bHalfTone ? HALFTONE : COLORONCOLOR); - if (GetObjectType(m_hDC) == OBJ_MEMDC) { + DWORD obj_type = GetObjectType(m_hDC); + m_bMetafileDCType = obj_type == OBJ_ENHMETADC || obj_type == OBJ_ENHMETAFILE; + if (obj_type == OBJ_MEMDC) { HBITMAP hBitmap = CreateBitmap(1, 1, 1, 1, nullptr); hBitmap = (HBITMAP)SelectObject(m_hDC, hBitmap); BITMAP bitmap; @@ -940,45 +942,45 @@ void* CGdiDeviceDriver::GetPlatformSurface() const { void CGdiDeviceDriver::DrawLine(FX_FLOAT x1, FX_FLOAT y1, FX_FLOAT x2, - FX_FLOAT y2, - const CFX_Matrix* pMatrix) { - bool bStartOutOfBounds = x1 < 0 || x1 > m_Width || y1 < 0 || y1 > m_Height; - bool bEndOutOfBounds = x2 < 0 || x2 > m_Width || y2 < 0 || y2 > m_Height; - if (bStartOutOfBounds & bEndOutOfBounds) - return; + FX_FLOAT y2) { + if (!m_bMetafileDCType) { // EMF drawing is not bound to the DC. + int startOutOfBoundsFlag = (x1 < 0) | ((x1 > m_Width) << 1) | + ((y1 < 0) << 2) | ((y1 > m_Height) << 3); + int endOutOfBoundsFlag = (x2 < 0) | ((x2 > m_Width) << 1) | + ((y2 < 0) << 2) | ((y2 > m_Height) << 3); + if (startOutOfBoundsFlag & endOutOfBoundsFlag) + return; - if (bStartOutOfBounds || bEndOutOfBounds) { - FX_FLOAT x[2]; - FX_FLOAT y[2]; - int np; + if (startOutOfBoundsFlag || endOutOfBoundsFlag) { + FX_FLOAT x[2]; + FX_FLOAT y[2]; + int np; #ifdef _SKIA_SUPPORT_ - // TODO(caryclark) temporary replacement of antigrain in line function - // to permit removing antigrain altogether - rect_base rect = {0.0f, 0.0f, (FX_FLOAT)(m_Width), (FX_FLOAT)(m_Height)}; - np = clip_liang_barsky(x1, y1, x2, y2, rect, x, y); + // TODO(caryclark) temporary replacement of antigrain in line function + // to permit removing antigrain altogether + rect_base rect = {0.0f, 0.0f, (FX_FLOAT)(m_Width), (FX_FLOAT)(m_Height)}; + np = clip_liang_barsky(x1, y1, x2, y2, rect, x, y); #else - agg::rect_base rect(0.0f, 0.0f, (FX_FLOAT)(m_Width), - (FX_FLOAT)(m_Height)); - np = agg::clip_liang_barsky(x1, y1, x2, y2, rect, x, y); + agg::rect_base rect(0.0f, 0.0f, (FX_FLOAT)(m_Width), + (FX_FLOAT)(m_Height)); + np = agg::clip_liang_barsky(x1, y1, x2, y2, rect, x, y); #endif - if (np == 0) - return; + if (np == 0) + return; - if (np == 1) { - x2 = x[0]; - y2 = y[0]; - } else { - ASSERT(np == 2); - x1 = x[0]; - y1 = y[0]; - x2 = x[1]; - y2 = y[1]; + if (np == 1) { + x2 = x[0]; + y2 = y[0]; + } else { + ASSERT(np == 2); + x1 = x[0]; + y1 = y[0]; + x2 = x[1]; + y2 = y[1]; + } } } - if (pMatrix) { - pMatrix->Transform(x1, y1); - pMatrix->Transform(x2, y2); - } + MoveToEx(m_hDC, FXSYS_round(x1), FXSYS_round(y1), nullptr); LineTo(m_hDC, FXSYS_round(x2), FXSYS_round(y2)); } @@ -1057,7 +1059,11 @@ bool CGdiDeviceDriver::DrawPath(const CFX_PathData* pPathData, FX_FLOAT y1 = pPathData->GetPointY(0); FX_FLOAT x2 = pPathData->GetPointX(1); FX_FLOAT y2 = pPathData->GetPointY(1); - DrawLine(x1, y1, x2, y2, pMatrix); + if (pMatrix) { + pMatrix->Transform(x1, y1); + pMatrix->Transform(x2, y2); + } + DrawLine(x1, y1, x2, y2); } else { SetPathToDC(m_hDC, pPathData, pMatrix); if (pGraphState && stroke_alpha) { diff --git a/core/fxge/win32/win32_int.h b/core/fxge/win32/win32_int.h index fa1cc6830e..ae090b72d3 100644 --- a/core/fxge/win32/win32_int.h +++ b/core/fxge/win32/win32_int.h @@ -152,11 +152,7 @@ class CGdiDeviceDriver : public IFX_RenderDeviceDriver { bool GetClipBox(FX_RECT* pRect) override; void* GetPlatformSurface() const override; - void DrawLine(FX_FLOAT x1, - FX_FLOAT y1, - FX_FLOAT x2, - FX_FLOAT y2, - const CFX_Matrix* pMatrix); + void DrawLine(FX_FLOAT x1, FX_FLOAT y1, FX_FLOAT x2, FX_FLOAT y2); bool GDI_SetDIBits(CFX_DIBitmap* pBitmap, const FX_RECT* pSrcRect, @@ -177,6 +173,7 @@ class CGdiDeviceDriver : public IFX_RenderDeviceDriver { uint32_t flags); HDC m_hDC; + bool m_bMetafileDCType; int m_Width; int m_Height; int m_nBitsPerPixel; -- cgit v1.2.3