Adding crude Android native screen driver

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.4@12695 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

1 files changed, 492 insertions, 0 deletions

diff --git a/src/drivers/Android/Fl_Android_Graphics_Driver.cxx b/src/drivers/Android/Fl_Android_Graphics_Driver.cxx
new file mode 100644
index 000000000..837f63210
--- /dev/null
+++ b/src/drivers/Android/Fl_Android_Graphics_Driver.cxx
@@ -0,0 +1,492 @@
+//
+// "$Id: Fl_Android_Graphics_Driver.cxx 12655 2018-02-09 14:39:42Z AlbrechtS $"
+//
+// Rectangle drawing routines for the Fast Light Tool Kit (FLTK).
+//
+// Copyright 1998-2018 by Bill Spitzak and others.
+//
+// This library is free software. Distribution and use rights are outlined in
+// the file "COPYING" which should have been included with this file.  If this
+// file is missing or damaged, see the license at:
+//
+//     http://www.fltk.org/COPYING.php
+//
+// Please report all bugs and problems on the following page:
+//
+//     http://www.fltk.org/str.php
+//
+
+
+#include "../../config_lib.h"
+#include "Fl_Android_Graphics_Driver.h"
+#include <FL/Fl.H>
+#include <FL/platform.H>
+#include <errno.h>
+
+#include "Fl_Android_Screen_Driver.H"
+#include <android/log.h>
+
+extern ANativeWindow_Buffer* gAGraphicsBuffer;
+
+#define  LOG_TAG    "libplasma"
+#define  LOGI(...)  __android_log_print(ANDROID_LOG_INFO,LOG_TAG,__VA_ARGS__)
+#define  LOGW(...)  __android_log_print(ANDROID_LOG_WARN,LOG_TAG,__VA_ARGS__)
+#define  LOGE(...)  __android_log_print(ANDROID_LOG_ERROR,LOG_TAG,__VA_ARGS__)
+
+
+/*
+ * By linking this module, the following static method will instantiate the
+ * Windows GDI Graphics driver as the main display driver.
+ */
+Fl_Graphics_Driver *Fl_Graphics_Driver::newMainGraphicsDriver()
+{
+  return new Fl_Android_Graphics_Driver();
+}
+
+
+static uint16_t  make565(int red, int green, int blue)
+{
+    return (uint16_t)( ((red   << 8) & 0xf800) |
+                       ((green << 3) & 0x07e0) |
+                       ((blue  >> 3) & 0x001f) );
+}
+
+extern unsigned fl_cmap[256];
+
+static uint16_t make565(Fl_Color crgba)
+{
+  if (crgba<0x00000100) crgba = fl_cmap[crgba];
+    return (uint16_t)( ((crgba >>16) & 0xf800) |
+                       ((crgba >>13) & 0x07e0) |
+                       ((crgba >>11) & 0x001f) );
+}
+
+
+void Fl_Android_Graphics_Driver::rectf_unscaled(float x, float y, float w, float h) {
+  if (w<=0 || h<=0) return;
+
+// TODO: clip the rectangle to the window outline
+// TODO: clip the rectangle to all parts of the window region
+// TODo: clip the rectangle to all parts of the current clipping region
+
+  uint16_t cc = make565(color());
+  uint32_t ss = gAGraphicsBuffer->stride;
+  uint16_t *bits = (uint16_t*)gAGraphicsBuffer->bits;
+  uint32_t xx = (uint32_t)x;
+  uint32_t yy = (uint32_t)y;
+  uint32_t ww = (uint32_t)w;
+  uint32_t hh = (uint32_t)h;
+  for (uint32_t iy = yy; iy<hh; ++iy) {
+    uint16_t *d = bits + iy*ss + xx;
+    for (uint32_t ix = ww; ix>0; --ix) {
+      *d++ = cc;
+    }
+  }
+}
+
+void Fl_Android_Graphics_Driver::xyline_unscaled(float x, float y, float x1)
+{
+  uint16_t cc = make565(color());
+  float w;
+  if (x1>x) {
+    w = x1-x;
+  } else {
+    w = x-x1;
+    x = x1;
+  }
+  uint32_t ss = gAGraphicsBuffer->stride;
+  uint16_t *bits = (uint16_t*)gAGraphicsBuffer->bits;
+  uint32_t xx = (uint32_t)x;
+  uint32_t yy = (uint32_t)y;
+  uint32_t ww = (uint32_t)w;
+  uint16_t *d = bits + yy*ss + xx;
+  for (uint32_t ix = ww; ix>0; --ix) {
+    *d++ = cc;
+  }
+}
+
+void Fl_Android_Graphics_Driver::yxline_unscaled(float x, float y, float y1)
+{
+  uint16_t cc = make565(color());
+  float h;
+  if (y1>y) {
+    h = y1-y;
+  } else {
+    h = y-y1;
+    y = y1;
+  }
+  uint32_t ss = gAGraphicsBuffer->stride;
+  uint16_t *bits = (uint16_t*)gAGraphicsBuffer->bits;
+  uint32_t xx = (uint32_t)x;
+  uint32_t yy = (uint32_t)y;
+  uint32_t hh = (uint32_t)h;
+  uint16_t *d = bits + yy*ss + xx;
+  for (uint32_t iy = hh; iy>0; --iy) {
+    *d = cc;
+    d += ss;
+  }
+}
+
+
+// -- fun with text rendering
+
+#define STB_TRUETYPE_IMPLEMENTATION  // force following include to generate implementation
+#include "stb_truetype.h"
+
+unsigned char ttf_buffer[1<<25];
+
+static int render_letter(int xx, int yy, uint32_t c)
+{
+   static bool once = 0;
+   static stbtt_fontinfo font;
+   unsigned char *bitmap;
+   int w,h,i,j, size = 30;
+   int dx, dy;
+
+LOGE("Render letter %c", c);
+if (once==0) {
+   once = 1;
+   FILE *f = fopen("/system/fonts/DroidSans.ttf", "rb");
+   if (f==NULL) {
+     LOGE("ERROR reading font %d!", errno);
+     return 0;
+   }
+   fread(ttf_buffer, 1, 1<<25, f);
+
+   stbtt_InitFont(&font, ttf_buffer, stbtt_GetFontOffsetForIndex(ttf_buffer,0));
+}
+
+#if 0
+   scale = stbtt_ScaleForPixelHeight(&font, 15);
+   stbtt_GetFontVMetrics(&font, &ascent,0,0);
+   baseline = (int) (ascent*scale);
+
+   while (text[ch]) {
+      int advance,lsb,x0,y0,x1,y1;
+      float x_shift = xpos - (float) floor(xpos);
+      stbtt_GetCodepointHMetrics(&font, text[ch], &advance, &lsb);
+      stbtt_GetCodepointBitmapBoxSubpixel(&font, text[ch], scale,scale,x_shift,0, &x0,&y0,&x1,&y1);
+      stbtt_MakeCodepointBitmapSubpixel(&font, &screen[baseline + y0][(int) xpos + x0], x1-x0,y1-y0, 79, scale,scale,x_shift,0, text[ch]);
+      // note that this stomps the old data, so where character boxes overlap (e.g. 'lj') it's wrong
+      // because this API is really for baking character bitmaps into textures. if you want to render
+      // a sequence of characters, you really need to render each bitmap to a temp buffer, then
+      // "alpha blend" that into the working buffer
+      xpos += (advance * scale);
+      if (text[ch+1])
+         xpos += scale*stbtt_GetCodepointKernAdvance(&font, text[ch],text[ch+1]);
+      ++ch;
+   }
+
+#endif
+
+
+   bitmap = stbtt_GetCodepointBitmap(&font, 0,stbtt_ScaleForPixelHeight(&font, size), c, &w, &h, &dx, &dy);
+
+  // rrrr.rggg.gggb.bbbb
+  xx += dx; yy += dy;
+  uint16_t cc = make565(fl_color()), cc12 = (cc&0xf7de)>>1, cc14 = (cc12&0xf7de)>>1, cc34 = cc12+cc14;
+  uint32_t ss = gAGraphicsBuffer->stride;
+  uint16_t *bits = (uint16_t*)gAGraphicsBuffer->bits;
+  uint32_t ww = w;
+  uint32_t hh = h;
+  unsigned char *s = bitmap;
+  for (uint32_t iy = 0; iy<hh; ++iy) {
+    uint16_t *d = bits + (yy+iy)*ss + xx;
+    for (uint32_t ix = 0; ix<ww; ++ix) {
+#if 1
+      // 5 step antialiasing
+      unsigned char v = *s++;
+      if (v>200) { // 100% black
+        *d = cc;
+      } else if (v<50) { // 0%
+      } else if (v>150) { // 75%
+        uint16_t nn = *d, nn14 = (nn&0xe79c)>>2;
+        *d = nn14 + cc34;
+      } else if (v<100) { // 25%
+        uint16_t nn = *d, nn12 = (nn&0xf7de)>>1, nn14 = (nn12&0xf7de)>>1, nn34 = nn12+nn14;
+        *d = nn34 + cc14;
+      } else { // 50%
+        uint16_t nn = *d, nn12 = (nn&0xf7de)>>1;
+        *d = nn12 + cc12;
+      }
+#else
+      // pure black and white
+      if (*s++ > 128)
+        *d = cc;
+#endif
+      d++;
+    }
+  }
+   stbtt_FreeBitmap(bitmap, 0L);
+      int advance,lsb;
+      stbtt_GetCodepointHMetrics(&font, c, &advance, &lsb);
+   float scale = stbtt_ScaleForPixelHeight(&font, size);
+   return xx+advance*scale;
+}
+
+void Fl_Android_Graphics_Driver::draw_unscaled(const char* str, int n, int x, int y)
+{
+  if (str) {
+    x = x+16*(-n/2);
+    for (int i=0; i<n; i++)
+      x = render_letter(x, y+5, str[i]);
+  }
+}
+
+#if 0
+
+// Code used to switch output to an off-screen window.  See macros in
+// win32.H which save the old state in local variables.
+
+typedef struct { BYTE a; BYTE b; BYTE c; BYTE d; } FL_BLENDFUNCTION;
+typedef BOOL (WINAPI* fl_alpha_blend_func)
+(HDC,int,int,int,int,HDC,int,int,int,int,FL_BLENDFUNCTION);
+static fl_alpha_blend_func fl_alpha_blend = NULL;
+static FL_BLENDFUNCTION blendfunc = { 0, 0, 255, 1};
+
+/* Reference to the current device context
+ For back-compatibility only. The preferred procedure to get this reference is
+ Fl_Surface_Device::surface()->driver()->gc().
+ */
+HDC fl_gc = 0;
+
+void Fl_GDI_Graphics_Driver::global_gc()
+{
+  fl_gc = (HDC)gc();
+}
+
+/*
+ * This function checks if the version of Windows that we
+ * curently run on supports alpha blending for bitmap transfers
+ * and finds the required function if so.
+ */
+char Fl_GDI_Graphics_Driver::can_do_alpha_blending() {
+  static char been_here = 0;
+  static char can_do = 0;
+  // do this test only once
+  if (been_here) return can_do;
+  been_here = 1;
+  // load the library that implements alpha blending
+  HMODULE hMod = LoadLibrary("MSIMG32.DLL");
+  // give up if that doesn't exist (Win95?)
+  if (!hMod) return 0;
+  // now find the blending function inside that dll
+  fl_alpha_blend = (fl_alpha_blend_func)GetProcAddress(hMod, "AlphaBlend");
+  // give up if we can't find it (Win95)
+  if (!fl_alpha_blend) return 0;
+  // we have the call, but does our display support alpha blending?
+  // get the desktop's device context
+  HDC dc = GetDC(0L);
+  if (!dc) return 0;
+  // check the device capabilities flags. However GetDeviceCaps
+  // does not return anything useful, so we have to do it manually:
+
+  HBITMAP bm = CreateCompatibleBitmap(dc, 1, 1);
+  HDC new_gc = CreateCompatibleDC(dc);
+  int save = SaveDC(new_gc);
+  SelectObject(new_gc, bm);
+  /*COLORREF set = */ SetPixel(new_gc, 0, 0, 0x01010101);
+  BOOL alpha_ok = fl_alpha_blend(dc, 0, 0, 1, 1, new_gc, 0, 0, 1, 1, blendfunc);
+  RestoreDC(new_gc, save);
+  DeleteDC(new_gc);
+  DeleteObject(bm);
+  ReleaseDC(0L, dc);
+
+  if (alpha_ok) can_do = 1;
+  return can_do;
+}
+
+HDC fl_makeDC(HBITMAP bitmap) {
+  HDC new_gc = CreateCompatibleDC((HDC)Fl_Graphics_Driver::default_driver().gc());
+  SetTextAlign(new_gc, TA_BASELINE|TA_LEFT);
+  SetBkMode(new_gc, TRANSPARENT);
+#if USE_COLORMAP
+  if (fl_palette) SelectPalette(new_gc, fl_palette, FALSE);
+#endif
+  SelectObject(new_gc, bitmap);
+  return new_gc;
+}
+
+void Fl_GDI_Graphics_Driver::copy_offscreen(int x, int y, int w, int h, Fl_Offscreen bitmap, int srcx, int srcy) {
+  HDC new_gc = CreateCompatibleDC(gc_);
+  int save = SaveDC(new_gc);
+  SelectObject(new_gc, bitmap);
+  BitBlt(gc_, x*scale_, y*scale_, w*scale_, h*scale_, new_gc, srcx*scale_, srcy*scale_, SRCCOPY);
+  RestoreDC(new_gc, save);
+  DeleteDC(new_gc);
+}
+
+BOOL Fl_GDI_Graphics_Driver::alpha_blend_(int x, int y, int w, int h, HDC src_gc, int srcx, int srcy, int srcw, int srch) {
+  return fl_alpha_blend(gc_, x, y, w, h, src_gc, srcx, srcy, srcw, srch, blendfunc);
+}
+
+#if ! defined(FL_DOXYGEN)
+void Fl_GDI_Graphics_Driver::copy_offscreen_with_alpha(int x,int y,int w,int h,HBITMAP bitmap,int srcx,int srcy) {
+  HDC new_gc = CreateCompatibleDC(gc_);
+  int save = SaveDC(new_gc);
+  SelectObject(new_gc, bitmap);
+  BOOL alpha_ok = 0;
+  // first try to alpha blend
+  if ( can_do_alpha_blending() ) {
+    alpha_ok = alpha_blend_(x, y, w, h, new_gc, srcx, srcy, w, h);
+  }
+  // if that failed (it shouldn't), still copy the bitmap over, but now alpha is 1
+  if (!alpha_ok) {
+    BitBlt(gc_, x, y, w, h, new_gc, srcx, srcy, SRCCOPY);
+  }
+  RestoreDC(new_gc, save);
+  DeleteDC(new_gc);
+}
+
+void Fl_GDI_Graphics_Driver::translate_all(int x, int y) {
+  const int stack_height = 10;
+  if (depth == -1) {
+    origins = new POINT[stack_height];
+    depth = 0;
+  }
+  if (depth >= stack_height)  {
+    Fl::warning("Fl_Copy/Image_Surface: translate stack overflow!");
+    depth = stack_height - 1;
+  }
+  GetWindowOrgEx((HDC)gc(), origins+depth);
+  SetWindowOrgEx((HDC)gc(), origins[depth].x - x*scale_, origins[depth].y - y*scale_, NULL);
+  depth++;
+}
+
+void Fl_GDI_Graphics_Driver::untranslate_all() {
+  if (depth > 0) depth--;
+  SetWindowOrgEx((HDC)gc(), origins[depth].x, origins[depth].y, NULL);
+}
+#endif
+
+void Fl_GDI_Graphics_Driver::add_rectangle_to_region(Fl_Region r, int X, int Y, int W, int H) {
+  Fl_Region R = XRectangleRegion(X, Y, W, H);
+  CombineRgn(r, r, R, RGN_OR);
+  XDestroyRegion(R);
+}
+
+void Fl_GDI_Graphics_Driver::transformed_vertex0(float x, float y) {
+  if (!n || x != p[n-1].x || y != p[n-1].y) {
+    if (n >= p_size) {
+      p_size = p ? 2*p_size : 16;
+      p = (POINT*)realloc((void*)p, p_size*sizeof(*p));
+    }
+    p[n].x = x;
+    p[n].y = y;
+    n++;
+  }
+}
+
+void Fl_GDI_Graphics_Driver::fixloop() {  // remove equal points from closed path
+  while (n>2 && p[n-1].x == p[0].x && p[n-1].y == p[0].y) n--;
+}
+
+Fl_Region Fl_GDI_Graphics_Driver::XRectangleRegion(int x, int y, int w, int h) {
+  if (Fl_Surface_Device::surface() == Fl_Display_Device::display_device()) return CreateRectRgn(x,y,x+w,y+h);
+  // because rotation may apply, the rectangle becomes a polygon in device coords
+  POINT pt[4] = { {x, y}, {x + w, y}, {x + w, y + h}, {x, y + h} };
+  LPtoDP((HDC)fl_graphics_driver->gc(), pt, 4);
+  return CreatePolygonRgn(pt, 4, ALTERNATE);
+}
+
+void Fl_GDI_Graphics_Driver::XDestroyRegion(Fl_Region r) {
+  DeleteObject(r);
+}
+
+
+typedef BOOL(WINAPI* flTypeImmAssociateContextEx)(HWND, HIMC, DWORD);
+extern flTypeImmAssociateContextEx flImmAssociateContextEx;
+typedef HIMC(WINAPI* flTypeImmGetContext)(HWND);
+extern flTypeImmGetContext flImmGetContext;
+typedef BOOL(WINAPI* flTypeImmSetCompositionWindow)(HIMC, LPCOMPOSITIONFORM);
+extern flTypeImmSetCompositionWindow flImmSetCompositionWindow;
+typedef BOOL(WINAPI* flTypeImmReleaseContext)(HWND, HIMC);
+extern flTypeImmReleaseContext flImmReleaseContext;
+
+
+void Fl_GDI_Graphics_Driver::reset_spot()
+{
+}
+
+void Fl_GDI_Graphics_Driver::set_spot(int font, int size, int X, int Y, int W, int H, Fl_Window *win)
+{
+  if (!win) return;
+  Fl_Window* tw = win;
+  while (tw->parent()) tw = tw->window(); // find top level window
+
+  if (!tw->shown())
+    return;
+
+  HIMC himc = flImmGetContext(fl_xid(tw));
+
+  if (himc) {
+    COMPOSITIONFORM cfs;
+    cfs.dwStyle = CFS_POINT;
+    cfs.ptCurrentPos.x = X;
+    cfs.ptCurrentPos.y = Y - tw->labelsize();
+    MapWindowPoints(fl_xid(win), fl_xid(tw), &cfs.ptCurrentPos, 1);
+    flImmSetCompositionWindow(himc, &cfs);
+    flImmReleaseContext(fl_xid(tw), himc);
+  }
+}
+
+
+void Fl_GDI_Graphics_Driver::scale(float f) {
+  if (f != scale_) {
+    size_ = 0;
+    scale_ = f;
+//fprintf(LOG,"set scale to %f\n",f);fflush(LOG);
+  }
+}
+
+
+/* Rescale region r with factor f and returns the scaled region.
+ Region r is returned unchanged if r is null or f is 1.
+ The input region is deleted if dr is null.
+ */
+HRGN Fl_GDI_Graphics_Driver::scale_region(HRGN r, float f, Fl_GDI_Graphics_Driver *dr) {
+  if (r && f != 1) {
+    DWORD size = GetRegionData(r, 0, NULL);
+    RGNDATA *pdata = (RGNDATA*)malloc(size);
+    GetRegionData(r, size, pdata);
+    if (!dr) DeleteObject(r);
+    POINT pt = {0, 0};
+    if (dr && dr->depth >= 1) { // account for translation
+      GetWindowOrgEx((HDC)dr->gc(), &pt);
+      pt.x *= (f - 1);
+      pt.y *= (f - 1);
+    }
+    RECT *rects = (RECT*)&(pdata->Buffer);
+    int delta = (f > 1.75 ? 1 : 0) - int(f/2);
+    for (DWORD i = 0; i < pdata->rdh.nCount; i++) {
+      int x = rects[i].left * f + pt.x;
+      int y = rects[i].top * f + pt.y;
+      RECT R2;
+      R2.left = x + delta;
+      R2.top  = y + delta;
+      R2.right = int(rects[i].right * f) + pt.x - x + R2.left;
+      R2.bottom = int(rects[i].bottom * f) + pt.y - y + R2.top;
+      rects[i] = R2;
+    }
+    r = ExtCreateRegion(NULL, size, pdata);
+    free(pdata);
+  }
+  return r;
+}
+
+
+Fl_Region Fl_GDI_Graphics_Driver::scale_clip(float f) {
+  HRGN r = rstack[rstackptr];
+  HRGN r2 = scale_region(r, f, this);
+  return (r == r2 ? NULL : (rstack[rstackptr] = r2, r));
+}
+
+void Fl_GDI_Graphics_Driver::set_current_() {
+  restore_clip();
+}
+
+#endif
+
+//
+// End of "$Id: Fl_Android_Graphics_Driver.cxx 12655 2018-02-09 14:39:42Z AlbrechtS $".
+//