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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include <windows.h>
#include "nsMathUtils.h"
#include "gfxWindowsNativeDrawing.h"
#include "gfxWindowsSurface.h"
#include "gfxAlphaRecovery.h"
#include "gfxPattern.h"
#include "mozilla/gfx/2D.h"
#include "mozilla/gfx/Helpers.h"
#include "gfx2DGlue.h"
#include "cairo.h"
#include "cairo-win32.h"
using namespace mozilla;
using namespace mozilla::gfx;
enum {
RENDER_STATE_INIT,
RENDER_STATE_NATIVE_DRAWING,
RENDER_STATE_NATIVE_DRAWING_DONE,
RENDER_STATE_ALPHA_RECOVERY_BLACK,
RENDER_STATE_ALPHA_RECOVERY_BLACK_DONE,
RENDER_STATE_ALPHA_RECOVERY_WHITE,
RENDER_STATE_ALPHA_RECOVERY_WHITE_DONE,
RENDER_STATE_DONE
};
gfxWindowsNativeDrawing::gfxWindowsNativeDrawing(gfxContext* ctx,
const gfxRect& nativeRect,
uint32_t nativeDrawFlags)
: mContext(ctx),
mNativeRect(nativeRect),
mNativeDrawFlags(nativeDrawFlags),
mRenderState(RENDER_STATE_INIT) {}
HDC gfxWindowsNativeDrawing::BeginNativeDrawing() {
if (mRenderState == RENDER_STATE_INIT) {
RefPtr<gfxASurface> surf;
DrawTarget* drawTarget = mContext->GetDrawTarget();
cairo_t* cairo = nullptr;
if (drawTarget->GetBackendType() == BackendType::CAIRO) {
cairo = static_cast<cairo_t*>(
drawTarget->GetNativeSurface(NativeSurfaceType::CAIRO_CONTEXT));
if (cairo) {
cairo_surface_t* s = cairo_get_group_target(cairo);
if (s) {
mDeviceOffset = mContext->GetDeviceOffset();
double sdx, sdy;
cairo_surface_get_device_offset(s, &sdx, &sdy);
mDeviceOffset.x -= sdx;
mDeviceOffset.y -= sdy;
surf = gfxASurface::Wrap(s);
}
}
}
if (surf && surf->CairoStatus() != 0) return nullptr;
gfxMatrix m = mContext->CurrentMatrixDouble();
if (!m.HasNonTranslation())
mTransformType = TRANSLATION_ONLY;
else if (m.HasNonAxisAlignedTransform())
mTransformType = COMPLEX;
else
mTransformType = AXIS_ALIGNED_SCALE;
// if this is a native win32 surface, we don't have to
// redirect rendering to our own HDC; in some cases,
// we may be able to use the HDC from the surface directly.
if (surf && ((surf->GetType() == gfxSurfaceType::Win32 ||
surf->GetType() == gfxSurfaceType::Win32Printing) &&
(surf->GetContentType() == gfxContentType::COLOR ||
(surf->GetContentType() == gfxContentType::COLOR_ALPHA &&
(mNativeDrawFlags & CAN_DRAW_TO_COLOR_ALPHA))))) {
// grab the DC. This can fail if there is a complex clipping path,
// in which case we'll have to fall back.
mWinSurface = static_cast<gfxWindowsSurface*>(
static_cast<gfxASurface*>(surf.get()));
mDC = cairo_win32_get_dc_with_clip(cairo);
if (mDC) {
if (mTransformType == TRANSLATION_ONLY) {
mRenderState = RENDER_STATE_NATIVE_DRAWING;
mTranslation = m.GetTranslation();
} else if (((mTransformType == AXIS_ALIGNED_SCALE) &&
(mNativeDrawFlags & CAN_AXIS_ALIGNED_SCALE)) ||
(mNativeDrawFlags & CAN_COMPLEX_TRANSFORM)) {
mWorldTransform.eM11 = (FLOAT)m._11;
mWorldTransform.eM12 = (FLOAT)m._12;
mWorldTransform.eM21 = (FLOAT)m._21;
mWorldTransform.eM22 = (FLOAT)m._22;
mWorldTransform.eDx = (FLOAT)m._31;
mWorldTransform.eDy = (FLOAT)m._32;
mRenderState = RENDER_STATE_NATIVE_DRAWING;
}
}
}
// If we couldn't do native drawing, then we have to do two-buffer drawing
// and do alpha recovery
if (mRenderState == RENDER_STATE_INIT) {
mRenderState = RENDER_STATE_ALPHA_RECOVERY_BLACK;
// We round out our native rect here, that way the snapping will
// happen correctly.
mNativeRect.RoundOut();
// we only do the scale bit if we can do an axis aligned
// scale; otherwise we scale (if necessary) after
// rendering with cairo. Note that if we're doing alpha recovery,
// we cannot do a full complex transform with win32 (I mean, we could, but
// it would require more code that's not here.)
if (mTransformType == TRANSLATION_ONLY ||
!(mNativeDrawFlags & CAN_AXIS_ALIGNED_SCALE)) {
mScale = gfxSize(1.0, 1.0);
// Add 1 to the surface size; it's guaranteed to not be incorrect,
// and it fixes bug 382458
// There's probably a better fix, but I haven't figured out
// the root cause of the problem.
mTempSurfaceSize = IntSize((int32_t)ceil(mNativeRect.Width() + 1),
(int32_t)ceil(mNativeRect.Height() + 1));
} else {
// figure out the scale factors
mScale = m.ScaleFactors();
mWorldTransform.eM11 = (FLOAT)mScale.width;
mWorldTransform.eM12 = 0.0f;
mWorldTransform.eM21 = 0.0f;
mWorldTransform.eM22 = (FLOAT)mScale.height;
mWorldTransform.eDx = 0.0f;
mWorldTransform.eDy = 0.0f;
// See comment above about "+1"
mTempSurfaceSize =
IntSize((int32_t)ceil(mNativeRect.Width() * mScale.width + 1),
(int32_t)ceil(mNativeRect.Height() * mScale.height + 1));
}
}
}
if (mRenderState == RENDER_STATE_NATIVE_DRAWING) {
// we can just do native drawing directly to the context's surface
// do we need to use SetWorldTransform?
if (mTransformType != TRANSLATION_ONLY) {
SetGraphicsMode(mDC, GM_ADVANCED);
GetWorldTransform(mDC, &mOldWorldTransform);
SetWorldTransform(mDC, &mWorldTransform);
}
GetViewportOrgEx(mDC, &mOrigViewportOrigin);
SetViewportOrgEx(mDC, mOrigViewportOrigin.x - (int)mDeviceOffset.x,
mOrigViewportOrigin.y - (int)mDeviceOffset.y, nullptr);
return mDC;
} else if (mRenderState == RENDER_STATE_ALPHA_RECOVERY_BLACK ||
mRenderState == RENDER_STATE_ALPHA_RECOVERY_WHITE) {
// we're going to use mWinSurface to create our temporary surface here
// get us a RGB24 DIB; DIB is important, because
// we can later call GetImageSurface on it.
mWinSurface = new gfxWindowsSurface(mTempSurfaceSize);
mDC = mWinSurface->GetDC();
RECT r = {0, 0, mTempSurfaceSize.width, mTempSurfaceSize.height};
if (mRenderState == RENDER_STATE_ALPHA_RECOVERY_BLACK)
FillRect(mDC, &r, (HBRUSH)GetStockObject(BLACK_BRUSH));
else
FillRect(mDC, &r, (HBRUSH)GetStockObject(WHITE_BRUSH));
if ((mTransformType != TRANSLATION_ONLY) &&
(mNativeDrawFlags & CAN_AXIS_ALIGNED_SCALE)) {
SetGraphicsMode(mDC, GM_ADVANCED);
SetWorldTransform(mDC, &mWorldTransform);
}
return mDC;
} else {
NS_ERROR("Bogus render state!");
return nullptr;
}
}
bool gfxWindowsNativeDrawing::ShouldRenderAgain() {
switch (mRenderState) {
case RENDER_STATE_NATIVE_DRAWING_DONE:
return false;
case RENDER_STATE_ALPHA_RECOVERY_BLACK_DONE:
mRenderState = RENDER_STATE_ALPHA_RECOVERY_WHITE;
return true;
case RENDER_STATE_ALPHA_RECOVERY_WHITE_DONE:
return false;
default:
NS_ERROR(
"Invalid RenderState in gfxWindowsNativeDrawing::ShouldRenderAgain");
break;
}
return false;
}
void gfxWindowsNativeDrawing::EndNativeDrawing() {
if (mRenderState == RENDER_STATE_NATIVE_DRAWING) {
// we drew directly to the HDC in the context; undo our changes
SetViewportOrgEx(mDC, mOrigViewportOrigin.x, mOrigViewportOrigin.y,
nullptr);
if (mTransformType != TRANSLATION_ONLY)
SetWorldTransform(mDC, &mOldWorldTransform);
mWinSurface->MarkDirty();
mRenderState = RENDER_STATE_NATIVE_DRAWING_DONE;
} else if (mRenderState == RENDER_STATE_ALPHA_RECOVERY_BLACK) {
mBlackSurface = mWinSurface;
mWinSurface = nullptr;
mRenderState = RENDER_STATE_ALPHA_RECOVERY_BLACK_DONE;
} else if (mRenderState == RENDER_STATE_ALPHA_RECOVERY_WHITE) {
mWhiteSurface = mWinSurface;
mWinSurface = nullptr;
mRenderState = RENDER_STATE_ALPHA_RECOVERY_WHITE_DONE;
} else {
NS_ERROR(
"Invalid RenderState in gfxWindowsNativeDrawing::EndNativeDrawing");
}
}
void gfxWindowsNativeDrawing::PaintToContext() {
if (mRenderState == RENDER_STATE_NATIVE_DRAWING_DONE) {
// nothing to do, it already went to the context
mRenderState = RENDER_STATE_DONE;
} else if (mRenderState == RENDER_STATE_ALPHA_RECOVERY_WHITE_DONE) {
RefPtr<gfxImageSurface> black = mBlackSurface->GetAsImageSurface();
RefPtr<gfxImageSurface> white = mWhiteSurface->GetAsImageSurface();
if (!gfxAlphaRecovery::RecoverAlpha(black, white)) {
NS_ERROR("Alpha recovery failure");
return;
}
RefPtr<DataSourceSurface> source = Factory::CreateWrappingDataSourceSurface(
black->Data(), black->Stride(), black->GetSize(),
SurfaceFormat::B8G8R8A8);
{
DrawTarget* dt = mContext->GetDrawTarget();
AutoRestoreTransform autoRestoreTransform(dt);
Matrix newTransform = dt->GetTransform();
newTransform.PreTranslate(ToPoint(mNativeRect.TopLeft()));
dt->SetTransform(newTransform);
Rect rect(Point(0.0, 0.0), ToSize(mNativeRect.Size()));
Matrix m = Matrix::Scaling(1.0 / mScale.width, 1.0 / mScale.height);
SurfacePattern pat(source, ExtendMode::CLAMP, m);
dt->FillRect(rect, pat);
}
mRenderState = RENDER_STATE_DONE;
} else {
NS_ERROR("Invalid RenderState in gfxWindowsNativeDrawing::PaintToContext");
}
}
void gfxWindowsNativeDrawing::TransformToNativeRect(const gfxRect& r,
RECT& rout) {
/* If we're doing native drawing, then we're still in the coordinate space
* of the context; otherwise, we're in our own little world,
* relative to the passed-in nativeRect.
*/
gfxRect roundedRect(r);
if (mRenderState == RENDER_STATE_NATIVE_DRAWING) {
if (mTransformType == TRANSLATION_ONLY) {
roundedRect.MoveBy(mTranslation);
}
} else {
roundedRect.MoveBy(-mNativeRect.TopLeft());
}
roundedRect.Round();
rout.left = LONG(roundedRect.X());
rout.right = LONG(roundedRect.XMost());
rout.top = LONG(roundedRect.Y());
rout.bottom = LONG(roundedRect.YMost());
}