void CPDF_RenderStatus::DrawShadingPattern(CPDF_ShadingPattern* pattern,
CPDF_PageObject* pPageObj,
const CFX_Matrix* pObj2Device,
FX_BOOL bStroke) {
if (!pattern->Load()) {
return;
}
m_pDevice->SaveState();
if (pPageObj->m_Type == PDFPAGE_PATH) {
if (!SelectClipPath((CPDF_PathObject*)pPageObj, pObj2Device, bStroke)) {
m_pDevice->RestoreState();
return;
}
} else if (pPageObj->m_Type == PDFPAGE_IMAGE) {
FX_RECT rect = pPageObj->GetBBox(pObj2Device);
m_pDevice->SetClip_Rect(&rect);
} else {
return;
}
FX_RECT rect;
if (GetObjectClippedRect(pPageObj, pObj2Device, FALSE, rect)) {
m_pDevice->RestoreState();
return;
}
CFX_Matrix matrix = pattern->m_Pattern2Form;
matrix.Concat(*pObj2Device);
GetScaledMatrix(matrix);
int alpha = pPageObj->m_GeneralState.GetAlpha(bStroke);
DrawShading(pattern, &matrix, rect, alpha,
m_Options.m_ColorMode == RENDER_COLOR_ALPHA);
m_pDevice->RestoreState();
}
void GdiContext2D::clip()
{
// The clip() method must create a new clipping region by calculating the intersection
//of the current clipping region and the area described by the current path, using the
//non-zero winding number rule. Open subpaths must be implicitly closed when computing
//the clipping region, without affecting the actual subpaths. The new clipping region
//replaces the current clipping region.
//When the context is initialized, the clipping region must be set to the rectangle with the top left corner at (0,0) and the width and height of the coordinate space.
EndPath(m_hDC);
SelectClipPath(m_hDC, RGN_AND);
//TODO
}
// 窗口消息处理函数
LRESULT APIENTRY MainWndProc(
HWND hwnd,
UINT message,
WPARAM wParam,
LPARAM lParam)
{
PAINTSTRUCT ps;
switch (message)
{
case WM_PAINT:
hdc = BeginPaint(hwnd, &ps);
EndPaint(hwnd, &ps);
break;
case WM_COMMAND: // 菜单命令
switch (wParam)
{
case IDM_VANISH: // 消除客户区（在设置了修剪全其输出范围也会被限制）
hdc = GetDC(hwnd);
GetClientRect(hwnd, &rc);
FillRect(hdc, &rc, (HBRUSH)GetStockObject(WHITE_BRUSH));
DeleteDC( hdc);
break;
// 根据用户的菜单输入，设置修剪路径的组合模式
case IDM_AND:
iMode = RGN_AND;
break;
case IDM_COPY:
iMode = RGN_COPY;
break;
case IDM_DIFF:
iMode = RGN_DIFF;
break;
case IDM_OR:
iMode = RGN_OR;
break;
case IDM_XOR:
iMode = RGN_XOR;
break;
case IDM_CLIP:
{
// 获取窗口客户区的DC
hdc = GetDC(hwnd);
// 创建并为DC选择字体
// 消息在菜单中点击此项前需先选择字体
hfont = CreateFontIndirect(cf.lpLogFont);
hfontOld = (HFONT)SelectObject(hdc, hfont);
// 五个点，用于创建五角星区域
POINT point[5]= {{0,200},{600,200},{100,600},{300,0},{500,600}};
// 创建多边形区域，五角星
hrgn = CreatePolygonRgn(point, 5, WINDING);
// 将区域选择为修剪区域
SelectClipRgn(hdc, hrgn);
// 输出的文字
LPSTR szOut = "Lorem ipsum dolor sit amet, consectetur \n"
"adipisicing elit, sed do eiusmod tempor \n"
"incididunt ut labore et dolore magna \n"
"aliqua. Ut enim ad minim veniam, quis \n"
"nostrud exercitation ullamco laboris nisi \n"
"ut aliquip ex ea commodo consequat. Duis \n"
"aute irure dolor in reprehenderit in \n"
"voluptate velit esse cillum dolore eu \n"
"fugiat nulla pariatur. Excepteur sint \n"
"occaecat cupidatat non proident, sunt \n"
"in culpa qui officia deserunt mollit \n"
"anim id est laborum.\n";
// 窗口客户区，用于输出文字
RECT rect;
GetClientRect(hwnd,&rect);
// 设置文字背景为透明
SetBkMode(hdc, TRANSPARENT);
// 开始创建路径
BeginPath(hdc);
// 路径的形状为输出的文字
DrawText(hdc, szOut, lstrlen(szOut),&rect , DT_CENTER);
EndPath(hdc);// 路径已经为DC的当前路径
// 为DC选择修剪路径，使用用户通过菜单输入的模式
// 注意在进行此操作前需通过菜单选择组合模式
SelectClipPath(hdc, iMode);
// 输出放射状直线，以左上角为原点
// 计算线的终点
for (i = 0; i < 90; i++)
{
aflSin[i] = sin( (((double)i) / 180.0)
* 3.14159);
}
for (i = 0; i < 90; i++)
{
aflCos[i] = cos( (((double)i) / 180.0)
* 3.14159);
}
flRadius = 1000;// 线的长度（窗口大小为600*650）
// 画线，第一度画一条线
for (i = 0; i < 90; i++)
{
MoveToEx(hdc, nXStart, nYStart,
(LPPOINT) NULL);
LineTo(hdc, nXStart + ((int) (flRadius
* aflCos[i])),
nYStart + ((int) (flRadius
* aflSin[i])));
}
// 选择回字体，释放
SelectObject(hdc, hfontOld);
DeleteObject(hfont);
DeleteDC( hdc);
// 刷新窗口
UpdateWindow(hwnd);
break;
}
case IDM_FONT:
// 用户选择字体
cf.lStructSize = sizeof (CHOOSEFONT);
cf.hwndOwner = hwnd;
cf.lpLogFont = &lf;
cf.Flags = CF_SCREENFONTS | CF_EFFECTS;
cf.rgbColors = RGB(0, 255, 255);
cf.nFontType = SCREEN_FONTTYPE;
ChooseFont(&cf);
break;
default:
return DefWindowProc(hwnd, message, wParam,
lParam);
}
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hwnd, message, wParam, lParam);
}
return 0;
}
void CPDF_RenderStatus::DrawTilingPattern(CPDF_TilingPattern* pPattern,
CPDF_PageObject* pPageObj,
const CFX_Matrix* pObj2Device,
FX_BOOL bStroke) {
if (!pPattern->Load()) {
return;
}
m_pDevice->SaveState();
if (pPageObj->m_Type == PDFPAGE_PATH) {
if (!SelectClipPath((CPDF_PathObject*)pPageObj, pObj2Device, bStroke)) {
m_pDevice->RestoreState();
return;
}
} else if (pPageObj->m_Type == PDFPAGE_IMAGE) {
FX_RECT rect = pPageObj->GetBBox(pObj2Device);
m_pDevice->SetClip_Rect(&rect);
} else {
return;
}
FX_RECT clip_box = m_pDevice->GetClipBox();
if (clip_box.IsEmpty()) {
m_pDevice->RestoreState();
return;
}
CFX_Matrix dCTM = m_pDevice->GetCTM();
FX_FLOAT sa = FXSYS_fabs(dCTM.a);
FX_FLOAT sd = FXSYS_fabs(dCTM.d);
clip_box.right = clip_box.left + (int32_t)FXSYS_ceil(clip_box.Width() * sa);
clip_box.bottom = clip_box.top + (int32_t)FXSYS_ceil(clip_box.Height() * sd);
CFX_Matrix mtPattern2Device = pPattern->m_Pattern2Form;
mtPattern2Device.Concat(*pObj2Device);
GetScaledMatrix(mtPattern2Device);
FX_BOOL bAligned = FALSE;
if (pPattern->m_BBox.left == 0 && pPattern->m_BBox.bottom == 0 &&
pPattern->m_BBox.right == pPattern->m_XStep &&
pPattern->m_BBox.top == pPattern->m_YStep &&
(mtPattern2Device.IsScaled() || mtPattern2Device.Is90Rotated())) {
bAligned = TRUE;
}
CFX_FloatRect cell_bbox = pPattern->m_BBox;
mtPattern2Device.TransformRect(cell_bbox);
int width = (int)FXSYS_ceil(cell_bbox.Width());
int height = (int)FXSYS_ceil(cell_bbox.Height());
if (width == 0) {
width = 1;
}
if (height == 0) {
height = 1;
}
int min_col, max_col, min_row, max_row;
CFX_Matrix mtDevice2Pattern;
mtDevice2Pattern.SetReverse(mtPattern2Device);
CFX_FloatRect clip_box_p(clip_box);
clip_box_p.Transform(&mtDevice2Pattern);
min_col = (int)FXSYS_ceil(
FXSYS_Div(clip_box_p.left - pPattern->m_BBox.right, pPattern->m_XStep));
max_col = (int)FXSYS_floor(
FXSYS_Div(clip_box_p.right - pPattern->m_BBox.left, pPattern->m_XStep));
min_row = (int)FXSYS_ceil(
FXSYS_Div(clip_box_p.bottom - pPattern->m_BBox.top, pPattern->m_YStep));
max_row = (int)FXSYS_floor(
FXSYS_Div(clip_box_p.top - pPattern->m_BBox.bottom, pPattern->m_YStep));
if (width > clip_box.Width() || height > clip_box.Height() ||
width * height > clip_box.Width() * clip_box.Height()) {
CPDF_GraphicStates* pStates = NULL;
if (!pPattern->m_bColored) {
pStates = CloneObjStates(pPageObj, bStroke);
}
CPDF_Dictionary* pFormResource = NULL;
if (pPattern->m_pForm->m_pFormDict) {
pFormResource = pPattern->m_pForm->m_pFormDict->GetDict("Resources");
}
for (int col = min_col; col <= max_col; col++)
for (int row = min_row; row <= max_row; row++) {
FX_FLOAT orig_x, orig_y;
orig_x = col * pPattern->m_XStep;
orig_y = row * pPattern->m_YStep;
mtPattern2Device.Transform(orig_x, orig_y);
CFX_Matrix matrix = *pObj2Device;
matrix.Translate(orig_x - mtPattern2Device.e,
orig_y - mtPattern2Device.f);
m_pDevice->SaveState();
CPDF_RenderStatus status;
status.Initialize(m_pContext, m_pDevice, NULL, NULL, this, pStates,
&m_Options, pPattern->m_pForm->m_Transparency,
m_bDropObjects, pFormResource);
status.RenderObjectList(pPattern->m_pForm, &matrix);
m_pDevice->RestoreState();
}
m_pDevice->RestoreState();
delete pStates;
return;
}
if (bAligned) {
int orig_x = FXSYS_round(mtPattern2Device.e);
int orig_y = FXSYS_round(mtPattern2Device.f);
min_col = (clip_box.left - orig_x) / width;
if (clip_box.left < orig_x) {
min_col--;
}
max_col = (clip_box.right - orig_x) / width;
if (clip_box.right <= orig_x) {
max_col--;
}
min_row = (clip_box.top - orig_y) / height;
if (clip_box.top < orig_y) {
min_row--;
}
max_row = (clip_box.bottom - orig_y) / height;
if (clip_box.bottom <= orig_y) {
max_row--;
}
}
FX_FLOAT left_offset = cell_bbox.left - mtPattern2Device.e;
FX_FLOAT top_offset = cell_bbox.bottom - mtPattern2Device.f;
CFX_DIBitmap* pPatternBitmap = NULL;
if (width * height < 16) {
CFX_DIBitmap* pEnlargedBitmap =
DrawPatternBitmap(m_pContext->m_pDocument, m_pContext->m_pPageCache,
pPattern, pObj2Device, 8, 8, m_Options.m_Flags);
pPatternBitmap = pEnlargedBitmap->StretchTo(width, height);
delete pEnlargedBitmap;
} else {
pPatternBitmap = DrawPatternBitmap(
m_pContext->m_pDocument, m_pContext->m_pPageCache, pPattern,
pObj2Device, width, height, m_Options.m_Flags);
}
if (!pPatternBitmap) {
m_pDevice->RestoreState();
return;
}
if (m_Options.m_ColorMode == RENDER_COLOR_GRAY) {
pPatternBitmap->ConvertColorScale(m_Options.m_ForeColor,
m_Options.m_BackColor);
}
FX_ARGB fill_argb = GetFillArgb(pPageObj);
int clip_width = clip_box.right - clip_box.left;
int clip_height = clip_box.bottom - clip_box.top;
CFX_DIBitmap screen;
if (!screen.Create(clip_width, clip_height, FXDIB_Argb)) {
return;
}
screen.Clear(0);
FX_DWORD* src_buf = (FX_DWORD*)pPatternBitmap->GetBuffer();
for (int col = min_col; col <= max_col; col++) {
for (int row = min_row; row <= max_row; row++) {
int start_x, start_y;
if (bAligned) {
start_x = FXSYS_round(mtPattern2Device.e) + col * width - clip_box.left;
start_y = FXSYS_round(mtPattern2Device.f) + row * height - clip_box.top;
} else {
FX_FLOAT orig_x = col * pPattern->m_XStep;
FX_FLOAT orig_y = row * pPattern->m_YStep;
mtPattern2Device.Transform(orig_x, orig_y);
start_x = FXSYS_round(orig_x + left_offset) - clip_box.left;
start_y = FXSYS_round(orig_y + top_offset) - clip_box.top;
}
if (width == 1 && height == 1) {
if (start_x < 0 || start_x >= clip_box.Width() || start_y < 0 ||
start_y >= clip_box.Height()) {
continue;
}
FX_DWORD* dest_buf =
(FX_DWORD*)(screen.GetBuffer() + screen.GetPitch() * start_y +
start_x * 4);
if (pPattern->m_bColored) {
*dest_buf = *src_buf;
} else {
*dest_buf = (*(uint8_t*)src_buf << 24) | (fill_argb & 0xffffff);
}
} else {
if (pPattern->m_bColored) {
screen.CompositeBitmap(start_x, start_y, width, height,
pPatternBitmap, 0, 0);
} else {
screen.CompositeMask(start_x, start_y, width, height, pPatternBitmap,
fill_argb, 0, 0);
}
}
}
}
CompositeDIBitmap(&screen, clip_box.left, clip_box.top, 0, 255,
FXDIB_BLEND_NORMAL, FALSE);
m_pDevice->RestoreState();
delete pPatternBitmap;
}