Add pixel read routine

src/inc/dcgrlib.plh

@@ -28,6 +28,7 @@ import dcgrlib
 
     predef dcgrColor(c)#0
     predef dcgrPlot(x, y)#0
+    predef dcgrPixel(x, y)#1
     predef dcgrHLin(x1, x2, y)#0
     predef dcgrVLin(y1, y2, x)#0
     predef dcgrBitMap(x, y, bitw, bith, bitptr)#0

src/inc/dcgrutils.plh

@@ -6,6 +6,7 @@ import dcgrutils
     predef dcgrBoldStr(clr, x, y, strptr)#0
     predef dcgrFont(font)#0
     predef dcgrRect(x, y, w, h)#0
+    predef dcgrGetPixMap(x, y, w, h)#1
     predef dhgrSet(dhx, y)#0
     predef dhgrUnset(dhx, y)#0
     predef spriteRead(filestr)#5

src/libsrc/apple/dcgrlib.pla

@@ -2122,6 +2122,38 @@ export def dcgrMemBl7Tile(x7, y, memptr, memspan, tileptr)#0
     next
 end
 //
+// Read pixel and return color
+//
+export def dcgrPixel(x, y)#1
+    byte x7, m7, i
+    word[2] pix7, clr7
+    word amask, mmask
+
+    x7 = divmod7[x] >> 3
+    if dcgrSurface // Memory
+        dcgrMemBl7Mem(x7, y, surfWidth, surfHeight, surfPtr, surfSpan, 1, 1, @pix7)
+    else // Screen
+        dcgrScrBl7Mem(x7, y, 1, 1, @pix7, 4)
+    fin
+    m7 = divmod7[x] & $07
+    amask = auxclrmsk[m7]
+    if amask & $80; amask = (amask & $7F) << 8; fin
+    mmask = memclrmsk[m7]
+    if mmask & $80; mmask = (mmask & $7F) << 8; fin
+    pix7[0] = pix7[0] & amask
+    pix7[1] = pix7[1] & mmask
+    for i = 0 to 15
+//        clr7[0] = (auxclrsl[i] | (auxclrsh[i] << 8)) & amask
+//        clr7[1] = (memclrsl[i] | (memclrsh[i] << 8)) & mmask
+//        if pix7[0] == clr7[0] and pix7[1] == clr7[1]
+        if pix7[0] == (auxclrsl[i] | (auxclrsh[i] << 8)) & amask
+        if pix7[1] == (memclrsl[i] | (memclrsh[i] << 8)) & mmask
+            return i // Color match
+        fin; fin
+    next
+    return 15
+end
+//
 // Hack to extend parameters for memory functions
 //
 def extPlotMem#0

src/libsrc/apple/dcgrutils.pla

@@ -126,6 +126,21 @@ export def dcgrRect(x, y, w, h)#0
         dcgrHLin(x, x2, v)
     next
 end
+export def dcgrGetPixMap(x, y, w, h)#1
+    var pixmap, pixptr
+    byte i, j
+
+    pixmap = heapalloc((w + 1)/2 * h)
+    pixptr = pixmap
+    w--; h--
+    for j = 0 to h
+        for i = 0 to w step 2
+            ^pixptr = dcgrPixel(i+x, j+y) | (dcgrPixel(i+x+1, j+y) << 4)
+            pixptr++
+        next
+    next
+    return pixmap
+end
 export def dhgrSet(dhx, y)#0
     dcgrColor(dhgrPix[dhx & $03])
     dcgrOp(OP_OR)

src/mkrel

@@ -112,6 +112,7 @@ cp rel/apple/DGRTEST#FE1000  prodos/demos/apple2/DGRTEST.REL
 mkdir prodos/demos/apple2/dcgr
 cp rel/apple/DCGRTEST#FE1000 prodos/demos/apple2/dcgr/DCGRTEST.REL
 cp samplesrc/ENT.*           prodos/demos/apple2/dcgr
+cp samplesrc/MONARCH.BIN     prodos/demos/apple2/dcgr
 
 mkdir prodos/demos/apple2/spiders
 cp rel/apple/SFM#FE1000     prodos/demos/apple2/spiders/SFM.REL

src/samplesrc/dcgrtest.pla

@@ -122,7 +122,6 @@ def dcgrCompMask(offset)#0
         dcgrMemBl7(sprite7w, i * SPR_H, sprite7w, SPR_H, sprite7msk[i], sprite7span)
     next
 end
-
 def readEnterprise#0
     var xorg, yorg, width, height, pixptr, t_ptr, f_ptr
     byte i
@@ -145,7 +144,6 @@ def readEnterprise#0
         f_ptr = f_ptr + 12
     next
 end
-
 ////////////////////////////////////////////////////////////////
 //                                                            //
 //                         Test Harness                       //
@@ -159,10 +157,7 @@ def dhgrTest#0
     //
     dcgrSurfScr(OP_OR)
     setlineplot(@dhgrSet)
-    for i = 0 to 191 step 4
-        line(0, 0, 559, i)
-    next
-    for i = 559 downto 0 step 7
+    for i = 559 downto 0 step 20
         line(0, 0, i, 191)
     next
     getc
@@ -441,6 +436,9 @@ end
 dcgrMode(0)
 dhgrTest
 screenRead("monarch")
+dcgrOp(OP_SRC)
+dcgrPixMap(10, 10, 20, 20, dcgrGetPixMap(60, 66, 20, 20))
+getc
 readEnterprise
 dcgrCompSprite(2)
 dcgrCompMask(2)