blob: 49e17552fde7667217565a36c70d2c2aae63d78f [file] [log] [blame]
// 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 "skia/ext/legacy_display_globals.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));
SkSurfaceProps props = skia::LegacyDisplayGlobals::GetSkSurfaceProps();
return size.isEmpty()
? nullptr
: SkSurface::MakeRasterDirect(size, backing.bmBits,
backing.bmWidthBytes, &props);
}
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