| // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "skia/ext/skia_utils_win.h" |
| |
| #include <stddef.h> |
| #include <windows.h> |
| |
| #include "base/debug/gdi_debug_util_win.h" |
| #include "third_party/skia/include/core/SkRect.h" |
| #include "third_party/skia/include/core/SkSurface.h" |
| #include "third_party/skia/include/core/SkTypes.h" |
| |
| namespace { |
| |
| static_assert(offsetof(RECT, left) == offsetof(SkIRect, fLeft), "o1"); |
| static_assert(offsetof(RECT, top) == offsetof(SkIRect, fTop), "o2"); |
| static_assert(offsetof(RECT, right) == offsetof(SkIRect, fRight), "o3"); |
| static_assert(offsetof(RECT, bottom) == offsetof(SkIRect, fBottom), "o4"); |
| static_assert(sizeof(RECT().left) == sizeof(SkIRect().fLeft), "o5"); |
| static_assert(sizeof(RECT().top) == sizeof(SkIRect().fTop), "o6"); |
| static_assert(sizeof(RECT().right) == sizeof(SkIRect().fRight), "o7"); |
| static_assert(sizeof(RECT().bottom) == sizeof(SkIRect().fBottom), "o8"); |
| static_assert(sizeof(RECT) == sizeof(SkIRect), "o9"); |
| |
| void CreateBitmapHeaderWithColorDepth(LONG width, |
| LONG height, |
| WORD color_depth, |
| BITMAPINFOHEADER* hdr) { |
| // These values are shared with gfx::PlatformDevice. |
| hdr->biSize = sizeof(BITMAPINFOHEADER); |
| hdr->biWidth = width; |
| hdr->biHeight = -height; // Minus means top-down bitmap. |
| hdr->biPlanes = 1; |
| hdr->biBitCount = color_depth; |
| hdr->biCompression = BI_RGB; // No compression. |
| hdr->biSizeImage = 0; |
| hdr->biXPelsPerMeter = 1; |
| hdr->biYPelsPerMeter = 1; |
| hdr->biClrUsed = 0; |
| hdr->biClrImportant = 0; |
| } |
| |
| } // namespace |
| |
| namespace skia { |
| |
| POINT SkPointToPOINT(const SkPoint& point) { |
| POINT win_point = { |
| SkScalarRoundToInt(point.fX), SkScalarRoundToInt(point.fY) |
| }; |
| return win_point; |
| } |
| |
| SkRect RECTToSkRect(const RECT& rect) { |
| SkRect sk_rect = { SkIntToScalar(rect.left), SkIntToScalar(rect.top), |
| SkIntToScalar(rect.right), SkIntToScalar(rect.bottom) }; |
| return sk_rect; |
| } |
| |
| SkColor COLORREFToSkColor(COLORREF color) { |
| #ifndef _MSC_VER |
| return SkColorSetRGB(GetRValue(color), GetGValue(color), GetBValue(color)); |
| #else |
| // ARGB = 0xFF000000 | ((0BGR -> RGB0) >> 8) |
| return 0xFF000000u | (_byteswap_ulong(color) >> 8); |
| #endif |
| } |
| |
| COLORREF SkColorToCOLORREF(SkColor color) { |
| #ifndef _MSC_VER |
| return RGB(SkColorGetR(color), SkColorGetG(color), SkColorGetB(color)); |
| #else |
| // 0BGR = ((ARGB -> BGRA) >> 8) |
| return (_byteswap_ulong(color) >> 8); |
| #endif |
| } |
| |
| void InitializeDC(HDC context) { |
| // Enables world transformation. |
| // If the GM_ADVANCED graphics mode is set, GDI always draws arcs in the |
| // counterclockwise direction in logical space. This is equivalent to the |
| // statement that, in the GM_ADVANCED graphics mode, both arc control points |
| // and arcs themselves fully respect the device context's world-to-device |
| // transformation. |
| BOOL res = SetGraphicsMode(context, GM_ADVANCED); |
| SkASSERT(res != 0); |
| |
| // Enables dithering. |
| res = SetStretchBltMode(context, HALFTONE); |
| SkASSERT(res != 0); |
| // As per SetStretchBltMode() documentation, SetBrushOrgEx() must be called |
| // right after. |
| res = SetBrushOrgEx(context, 0, 0, NULL); |
| SkASSERT(res != 0); |
| |
| // Sets up default orientation. |
| res = SetArcDirection(context, AD_CLOCKWISE); |
| SkASSERT(res != 0); |
| |
| // Sets up default colors. |
| res = SetBkColor(context, RGB(255, 255, 255)); |
| SkASSERT(res != CLR_INVALID); |
| res = SetTextColor(context, RGB(0, 0, 0)); |
| SkASSERT(res != CLR_INVALID); |
| res = SetDCBrushColor(context, RGB(255, 255, 255)); |
| SkASSERT(res != CLR_INVALID); |
| res = SetDCPenColor(context, RGB(0, 0, 0)); |
| SkASSERT(res != CLR_INVALID); |
| |
| // Sets up default transparency. |
| res = SetBkMode(context, OPAQUE); |
| SkASSERT(res != 0); |
| res = SetROP2(context, R2_COPYPEN); |
| SkASSERT(res != 0); |
| } |
| |
| void LoadTransformToDC(HDC dc, const SkMatrix& matrix) { |
| XFORM xf; |
| xf.eM11 = matrix[SkMatrix::kMScaleX]; |
| xf.eM21 = matrix[SkMatrix::kMSkewX]; |
| xf.eDx = matrix[SkMatrix::kMTransX]; |
| xf.eM12 = matrix[SkMatrix::kMSkewY]; |
| xf.eM22 = matrix[SkMatrix::kMScaleY]; |
| xf.eDy = matrix[SkMatrix::kMTransY]; |
| SetWorldTransform(dc, &xf); |
| } |
| |
| void CopyHDC(HDC source, HDC destination, int x, int y, bool is_opaque, |
| const RECT& src_rect, const SkMatrix& transform) { |
| |
| int copy_width = src_rect.right - src_rect.left; |
| int copy_height = src_rect.bottom - src_rect.top; |
| |
| // We need to reset the translation for our bitmap or (0,0) won't be in the |
| // upper left anymore |
| SkMatrix identity; |
| identity.reset(); |
| |
| LoadTransformToDC(source, identity); |
| if (is_opaque) { |
| BitBlt(destination, |
| x, |
| y, |
| copy_width, |
| copy_height, |
| source, |
| src_rect.left, |
| src_rect.top, |
| SRCCOPY); |
| } else { |
| SkASSERT(copy_width != 0 && copy_height != 0); |
| BLENDFUNCTION blend_function = {AC_SRC_OVER, 0, 255, AC_SRC_ALPHA}; |
| GdiAlphaBlend(destination, |
| x, |
| y, |
| copy_width, |
| copy_height, |
| source, |
| src_rect.left, |
| src_rect.top, |
| copy_width, |
| copy_height, |
| blend_function); |
| } |
| LoadTransformToDC(source, transform); |
| } |
| |
| SkImageInfo PrepareAllocation(HDC context, BITMAP* backing) { |
| HBITMAP backing_handle = |
| static_cast<HBITMAP>(GetCurrentObject(context, OBJ_BITMAP)); |
| const size_t backing_size = sizeof *backing; |
| return (GetObject(backing_handle, backing_size, backing) == backing_size) |
| ? SkImageInfo::MakeN32Premul(backing->bmWidth, backing->bmHeight) |
| : SkImageInfo(); |
| } |
| |
| sk_sp<SkSurface> MapPlatformSurface(HDC context) { |
| BITMAP backing; |
| const SkImageInfo size(PrepareAllocation(context, &backing)); |
| return size.isEmpty() ? nullptr |
| : SkSurface::MakeRasterDirect(size, backing.bmBits, |
| backing.bmWidthBytes); |
| } |
| |
| SkBitmap MapPlatformBitmap(HDC context) { |
| BITMAP backing; |
| const SkImageInfo size(PrepareAllocation(context, &backing)); |
| SkBitmap bitmap; |
| if (!size.isEmpty()) |
| bitmap.installPixels(size, backing.bmBits, size.minRowBytes()); |
| return bitmap; |
| } |
| |
| void CreateBitmapHeader(int width, int height, BITMAPINFOHEADER* hdr) { |
| CreateBitmapHeaderWithColorDepth(width, height, 32, hdr); |
| } |
| |
| HBITMAP CreateHBitmap(int width, int height, bool is_opaque, |
| HANDLE shared_section, void** data) { |
| // CreateDIBSection fails to allocate anything if we try to create an empty |
| // bitmap, so just create a minimal bitmap. |
| if ((width == 0) || (height == 0)) { |
| width = 1; |
| height = 1; |
| } |
| |
| BITMAPINFOHEADER hdr = {0}; |
| CreateBitmapHeader(width, height, &hdr); |
| HBITMAP hbitmap = CreateDIBSection(NULL, reinterpret_cast<BITMAPINFO*>(&hdr), |
| 0, data, shared_section, 0); |
| |
| // If CreateDIBSection() failed, try to get some useful information out |
| // before we crash for post-mortem analysis. |
| if (!hbitmap) |
| base::debug::CollectGDIUsageAndDie(&hdr, shared_section); |
| |
| return hbitmap; |
| } |
| |
| } // namespace skia |
| |