requestSubSurfaceBufferP()

uint16_t* Surface::requestSubSurfaceBufferP ( uint32_t  size )

inline

Definition at line 143 of file ILI9341_t3_ERIS.h.

                                                     {
        /* provides an interface to enable childern subsurfaces
           to request a portion of the parents surface buffer
 
           function input is size of the surface array of N elements
           each element of the array being two bytes (uint16_t).
           so the allocation head will be moved size * 2
        */
        uint16_t* pSSB;
        if ((head + size) > alloc_size){
            //not enough space
            Serial.println(F("M ERROR: Surface out of MEM"));
            return NULL;
        }
        if (!pSB){
            Serial.println(F("M ERROR: Surface has no buffer"));
            return NULL;
        }
        pSSB = pSB + (head); 
        head += size;
        Serial.println(F("M SubSurface allocated"));
        Serial.print(F("M Surface buffer remaining:"));
        Serial.println(alloc_size - head);
        return pSSB;
    }

References alloc_size, head, and pSB.

Referenced by Surface().

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