wxHTML: Support percentage width in IMG tag.

(Patch #11800 by lpoujoulat) Fixes #11800.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@63766 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/doxygen/overviews/html.h

@@ -526,7 +526,7 @@ H5
 H6
 I
 IMG             SRC=[url]
-                WIDTH=[pixels]
+                WIDTH=[percent|pixels]
                 HEIGHT=[pixels]
                 ALIGN=TEXTTOP
                 ALIGN=CENTER

src/html/m_image.cpp

@@ -286,7 +286,9 @@ class wxHtmlImageCell : public wxHtmlCell
 {
 public:
     wxHtmlImageCell(wxHtmlWindowInterface *windowIface,
-                    wxFSFile *input, int w = wxDefaultCoord, int h = wxDefaultCoord,
+                    wxFSFile *input,
+                    int w = wxDefaultCoord, bool wpercent = false,
+                    int h = wxDefaultCoord, bool hpresent = false,
                     double scale = 1.0, int align = wxHTML_ALIGN_BOTTOM,
                     const wxString& mapname = wxEmptyString);
     virtual ~wxHtmlImageCell();
@@ -302,7 +304,10 @@ public:
 
 private:
     wxBitmap           *m_bitmap;
+    int                 m_align;
     int                 m_bmpW, m_bmpH;
+    bool                m_bmpWpercent:1;
+    bool                m_bmpHpresent:1;
     bool                m_showFrame:1;
     wxHtmlWindowInterface *m_windowIface;
 #if wxUSE_GIF && wxUSE_TIMER
@@ -343,15 +348,18 @@ class wxGIFTimer : public wxTimer
 
 wxHtmlImageCell::wxHtmlImageCell(wxHtmlWindowInterface *windowIface,
                                  wxFSFile *input,
-                                 int w, int h, double scale, int align,
+                                 int w, bool wpercent, int h, bool hpresent, double scale, int align,
                                  const wxString& mapname) : wxHtmlCell()
 {
     m_windowIface = windowIface;
     m_scale = scale;
     m_showFrame = false;
     m_bitmap = NULL;
-    m_bmpW = w;
+    m_bmpW   = w;
-    m_bmpH = h;
+    m_bmpH   = h;
+    m_align  = align;
+    m_bmpWpercent = wpercent;
+    m_bmpHpresent = hpresent;
     m_imageMap = NULL;
     m_mapName = mapname;
     SetCanLiveOnPagebreak(false);
@@ -432,22 +440,6 @@ wxHtmlImageCell::wxHtmlImageCell(wxHtmlWindowInterface *windowIface,
     }
     //else: ignore the 0-sized images used sometimes on the Web pages
 
-    m_Width = (int)(scale * (double)m_bmpW);
-    m_Height = (int)(scale * (double)m_bmpH);
-
-    switch (align)
-    {
-        case wxHTML_ALIGN_TOP :
-            m_Descent = m_Height;
-            break;
-        case wxHTML_ALIGN_CENTER :
-            m_Descent = m_Height / 2;
-            break;
-        case wxHTML_ALIGN_BOTTOM :
-        default :
-            m_Descent = 0;
-            break;
-    }
  }
 
 void wxHtmlImageCell::SetImage(const wxImage& img)
@@ -461,9 +453,9 @@ void wxHtmlImageCell::SetImage(const wxImage& img)
         ww = img.GetWidth();
         hh = img.GetHeight();
 
-        if ( m_bmpW == wxDefaultCoord )
+        if ( m_bmpW == wxDefaultCoord)
             m_bmpW = ww;
-        if ( m_bmpH == wxDefaultCoord )
+        if ( m_bmpH == wxDefaultCoord)
             m_bmpH = hh;
 
         // Only scale the bitmap at the rendering stage,
@@ -533,6 +525,35 @@ void wxHtmlImageCell::AdvanceAnimation(wxTimer *timer)
 
 void wxHtmlImageCell::Layout(int w)
 {
+    if (m_bmpWpercent)
+    {
+
+        m_Width = w*m_bmpW/100;
+
+        if (!m_bmpHpresent && m_bitmap != NULL)
+            m_Height = m_bitmap->GetHeight()*m_Width/m_bitmap->GetWidth();
+        else
+            m_Height = m_scale*m_bmpH;
+    } else
+    {
+        m_Width  = m_scale*m_bmpW;
+        m_Height = m_scale*m_bmpH;
+    }
+
+    switch (m_align)
+    {
+        case wxHTML_ALIGN_TOP :
+            m_Descent = m_Height;
+            break;
+        case wxHTML_ALIGN_CENTER :
+            m_Descent = m_Height / 2;
+            break;
+        case wxHTML_ALIGN_BOTTOM :
+        default :
+            m_Descent = 0;
+            break;
+    }
+
     wxHtmlCell::Layout(w);
     m_physX = m_physY = wxDefaultCoord;
 }
@@ -566,17 +587,17 @@ void wxHtmlImageCell::Draw(wxDC& dc, int x, int y,
         // and height, so we only do the scaling once.
         double imageScaleX = 1.0;
         double imageScaleY = 1.0;
-        if (m_bmpW != m_bitmap->GetWidth())
+        if (m_Width != m_bitmap->GetWidth())
-            imageScaleX = (double) m_bmpW / (double) m_bitmap->GetWidth();
+            imageScaleX = (double) m_Width / (double) m_bitmap->GetWidth();
-        if (m_bmpH != m_bitmap->GetHeight())
+        if (m_Height != m_bitmap->GetHeight())
-            imageScaleY = (double) m_bmpH / (double) m_bitmap->GetHeight();
+            imageScaleY = (double) m_Height / (double) m_bitmap->GetHeight();
 
         double us_x, us_y;
         dc.GetUserScale(&us_x, &us_y);
-        dc.SetUserScale(us_x * m_scale * imageScaleX, us_y * m_scale * imageScaleY);
+        dc.SetUserScale(us_x * imageScaleX, us_y * imageScaleY);
 
-        dc.DrawBitmap(*m_bitmap, (int) ((x + m_PosX) / (m_scale*imageScaleX)),
+        dc.DrawBitmap(*m_bitmap, (int) ((x + m_PosX) / (imageScaleX)),
-                                 (int) ((y + m_PosY) / (m_scale*imageScaleY)), true);
+                                 (int) ((y + m_PosY) / (imageScaleY)), true);
         dc.SetUserScale(us_x, us_y);
     }
 }
@@ -627,6 +648,8 @@ TAG_HANDLER_BEGIN(IMG, "IMG,MAP,AREA")
             if (tag.HasParam(wxT("SRC")))
             {
                 int w = wxDefaultCoord, h = wxDefaultCoord;
+                bool wpercent = false;
+                bool hpresent = false;
                 int al;
                 wxFSFile *str;
                 wxString tmp = tag.GetParam(wxT("SRC"));
@@ -635,9 +658,25 @@ TAG_HANDLER_BEGIN(IMG, "IMG,MAP,AREA")
                 str = m_WParser->OpenURL(wxHTML_URL_IMAGE, tmp);
 
                 if (tag.HasParam(wxT("WIDTH")))
-                    tag.GetParamAsInt(wxT("WIDTH"), &w);
+                {
+                    wxString param = tag.GetParam(wxT("WIDTH"));
+                    wxSscanf(param.c_str(), wxT("%i"), &w);
+                    if (param.EndsWith(wxT("%"))) {
+                        if (w < 0)
+                            w = 0;
+                        else if (w > 100)
+                            w = 100;
+                        wpercent = true;
+                    }
+
+                }
+
                 if (tag.HasParam(wxT("HEIGHT")))
+                {
                     tag.GetParamAsInt(wxT("HEIGHT"), &h);
+                    hpresent = true;
+                }
+
                 al = wxHTML_ALIGN_BOTTOM;
                 if (tag.HasParam(wxT("ALIGN")))
                 {
@@ -658,7 +697,7 @@ TAG_HANDLER_BEGIN(IMG, "IMG,MAP,AREA")
                 }
                 wxHtmlImageCell *cel = new wxHtmlImageCell(
                                           m_WParser->GetWindowInterface(),
-                                          str, w, h,
+                                          str, w, wpercent, h, hpresent,
                                           m_WParser->GetPixelScale(),
                                           al, mn);
                 m_WParser->ApplyStateToCell(cel);