// Copyright 2006-2008 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/351564777): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif
#include "skia/ext/skia_utils_win.h"
#include <windows.h>
#include <stddef.h>
#include "base/check_op.h"
#include "base/debug/gdi_debug_util_win.h"
#include "base/numerics/checked_math.h"
#include "base/win/scoped_hdc.h"
#include "base/win/scoped_hglobal.h"
#include "skia/ext/legacy_display_globals.h"
#include "skia/ext/skia_utils_base.h"
#include "third_party/skia/include/core/SkColorSpace.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;
}
// Fills in a BITMAPV5HEADER structure. This is to be used for images that have
// an alpha channel and are in the ARGB8888 format. This is because DIBV5 has an
// explicit mask for each component which default to XRGB and we manually set
// flag so the alpha channel is the first byte. This is not supported by the
// older-style BITMAPINFOHEADER.
void CreateBitmapV5HeaderForARGB8888(LONG width,
LONG height,
LONG image_size,
BITMAPV5HEADER* hdr) {
memset(hdr, 0, sizeof(BITMAPV5HEADER));
hdr->bV5Size = sizeof(BITMAPV5HEADER);
hdr->bV5Width = width;
// If height is positive this means that the image will be bottom-up.
hdr->bV5Height = height;
hdr->bV5Planes = 1;
hdr->bV5BitCount = 32;
hdr->bV5Compression = BI_RGB;
hdr->bV5AlphaMask = 0xff000000;
hdr->bV5CSType = LCS_WINDOWS_COLOR_SPACE;
hdr->bV5Intent = LCS_GM_IMAGES;
hdr->bV5ClrUsed = 0;
hdr->bV5ClrImportant = 0;
hdr->bV5ProfileData = 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
: SkSurfaces::WrapPixels(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 CreateBitmapHeaderForN32SkBitmap(const SkBitmap& bitmap,
BITMAPINFOHEADER* hdr) {
// Native HBITMAPs are XRGB-backed, and we expect SkBitmaps that we will use
// with them to also be of the same format.
CHECK_EQ(bitmap.colorType(), kN32_SkColorType);
// The header will be for an RGB bitmap with 32 bits-per-pixel. The SkBitmap
// data to go into the bitmap should be of the same size. If the SkBitmap
// SkColorType is for a larger number of bits-per-pixel, copying the SkBitmap
// into the HBITMAP for this header would cause a write out-of-bounds.
CHECK_EQ(4, bitmap.info().bytesPerPixel());
// The HBITMAP's bytes will always be tightly packed so we expect the SkBitmap
// to be also. Row padding would mean the number of bytes in the SkBitmap and
// in the HBITMAP for this header would be different, which can cause out-of-
// bound reads or writes.
CHECK_EQ(bitmap.rowBytes(), bitmap.width() * static_cast<size_t>(4));
CreateBitmapHeaderWithColorDepth(bitmap.width(), bitmap.height(), 32, hdr);
}
HGLOBAL CreateHGlobalForByteArray(
const std::vector<unsigned char>& byte_array) {
HGLOBAL hglobal = ::GlobalAlloc(GHND, byte_array.size());
if (!hglobal) {
return nullptr;
}
base::win::ScopedHGlobal<uint8_t*> global_mem(hglobal);
if (!global_mem.data()) {
::GlobalFree(hglobal);
return nullptr;
}
memcpy(global_mem.data(), byte_array.data(), byte_array.size());
return hglobal;
}
HGLOBAL CreateDIBV5ImageDataFromN32SkBitmap(const SkBitmap& bitmap) {
// While DIBV5 support bit flags which would allow us to put channels in a any
// order, we require an ARGB format because it is more convenient to use.
CHECK_EQ(bitmap.colorType(), kN32_SkColorType);
// The header will be for an ARGB bitmap with 32 bits-per-pixel. The SkBitmap
// data to go into the bitmap should be of the same size. If the SkBitmap
// SkColorType is for a larger number of bits-per-pixel, copying the SkBitmap
// into the DIBV5ImageData for this header would cause a write out-of-bounds.
CHECK_EQ(4, bitmap.info().bytesPerPixel());
// The DIBV5ImageData bytes will always be tightly packed so we expect the
// SkBitmap to be also. Row padding would mean the number of bytes in the
// SkBitmap and in the DIBV5ImageData for this header would be different,
// which can cause out-of- bound reads or writes.
CHECK_EQ(bitmap.rowBytes(), bitmap.width() * static_cast<size_t>(4));
int width = bitmap.width();
int height = bitmap.height();
size_t bytes;
// Native DIBV5 bitmaps store 32-bit ARGB data, and the SkBitmap used with it
// must also, as verified at the start of this function. A size_t type causes
// a type change from int when multiplying.
constexpr size_t bpp = 4;
if (!base::CheckMul(height, base::CheckMul(width, bpp)).AssignIfValid(&bytes))
return nullptr;
HGLOBAL hglobal = ::GlobalAlloc(GHND, sizeof(BITMAPV5HEADER) + bytes);
if (hglobal == nullptr)
return nullptr;
base::win::ScopedHGlobal<BITMAPV5HEADER*> header(hglobal);
if (!header.data()) {
::GlobalFree(hglobal);
return nullptr;
}
CreateBitmapV5HeaderForARGB8888(width, height, bytes, header.data());
auto* dst_pixels =
reinterpret_cast<uint8_t*>(header.data()) + sizeof(BITMAPV5HEADER);
// CreateBitmapV5HeaderForARGB8888 creates a bitmap with a positive height as
// stated in the image's header. Having a positive value implies that the
// image is stored bottom-up. As skia uses the opposite, we have to flip
// vertically so the image's content while copying in the DIBV5 data structure
// to account for that. In theory, we could use a negative value to avoid the
// flip, but not all programs treat a negative value properly.
SkImageInfo infoSRGB = bitmap.info()
.makeColorSpace(SkColorSpace::MakeSRGB())
.makeWH(bitmap.width(), 1);
const size_t row_bytes = bitmap.rowBytes();
for (size_t line = 0; line < height; line++) {
size_t flipped_line_index = height - 1 - line;
auto* current_dst = dst_pixels + (row_bytes * flipped_line_index);
bool success = bitmap.readPixels(infoSRGB, current_dst, row_bytes, 0, line);
DCHECK(success);
}
return hglobal;
}
base::win::ScopedBitmap CreateHBitmapFromN32SkBitmap(const SkBitmap& bitmap) {
BITMAPINFOHEADER header;
CreateBitmapHeaderForN32SkBitmap(bitmap, &header);
int width = bitmap.width();
int height = bitmap.height();
size_t bytes;
// Native HBITMAPs store 32-bit RGB data, and the SkBitmap used with it must
// also, as verified by CreateBitmapHeaderForN32SkBitmap(). A size_t type
// causes a type change from int when multiplying.
const size_t bpp = 4;
if (!base::CheckMul(height, base::CheckMul(width, bpp)).AssignIfValid(&bytes))
return {};
void* bits;
HBITMAP hbitmap;
{
base::win::ScopedGetDC screen_dc(nullptr);
// By giving a null hSection, the |bits| will be destroyed when the
// |hbitmap| is destroyed.
hbitmap =
CreateDIBSection(screen_dc, reinterpret_cast<BITMAPINFO*>(&header),
DIB_RGB_COLORS, &bits, nullptr, 0);
}
if (hbitmap) {
memcpy(bits, bitmap.getPixels(), bytes);
} else {
// If CreateDIBSection() failed, try to get some useful information out
// before we crash for post-mortem analysis.
base::debug::CollectGDIUsageAndDie(&header, nullptr);
}
return base::win::ScopedBitmap(hbitmap);
}
void CreateBitmapHeaderForXRGB888(int width,
int height,
BITMAPINFOHEADER* hdr) {
CreateBitmapHeaderWithColorDepth(width, height, 32, hdr);
}
base::win::ScopedBitmap CreateHBitmapXRGB8888(int width,
int height,
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};
CreateBitmapHeaderWithColorDepth(width, height, 32, &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 base::win::ScopedBitmap(hbitmap);
}
} // namespace skia
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