how can i stop alpha blending

[iinfinityy]

hello,

i have made the example on page 168 in the gd2 cook book. The example works fine for me, but i have a problem. after the code is done i will load an image but the image is not printed on the screen. why is that so? And what can i do to change this? Thanks for the help.



#include <EEPROM.h>

#include <SPI.h>

#include <GD2.h>



#define PAINT_ALPHA()  GD.BlendFunc(ONE, ONE_MINUS_SRC_ALPHA)

#define CLEAR_ALPHA()  GD.BlendFunc(ZERO, ONE_MINUS_SRC_ALPHA)



static void button(int x, int y, byte label)

{

int sz = 18; // button size in pixels

GD.Tag(label);

PAINT_ALPHA();

GD.Begin(RECTS);

GD.LineWidth(16 * 20);

GD.Vertex2ii(x - sz, y - sz);

GD.Vertex2ii(x + sz, y + sz);

CLEAR_ALPHA();

GD.ColorA(200);

GD.ColorA(200);

GD.LineWidth(16 * 15);

GD.Vertex2ii(x - sz, y - sz);

GD.Vertex2ii(x + sz, y + sz);

GD.ColorA(0xff);

PAINT_ALPHA();

GD.cmd_number(x, y, 31, OPT_CENTER, label);

}



void setup()

{



Serial.begin(9600);



 GD.begin();

 

 GD.BitmapHandle(0);

 GD.cmd_loadimage(0, 0);

 GD.load("land.jpg");



 GD.BitmapHandle(1);

 GD.cmd_loadimage(-1, 0);

 GD.load("akku10.png");



GD.wr16(REG_HCYCLE, 928);

GD.wr16(REG_HOFFSET, 88);

GD.wr16(REG_HSIZE, 800);

GD.wr16(REG_HSYNC0, 0);

GD.wr16(REG_HSYNC1, 48);

GD.wr16(REG_VCYCLE, 525);

GD.wr16(REG_VOFFSET, 32);

GD.wr16(REG_VSIZE, 480);

GD.wr16(REG_VSYNC0, 0);

GD.wr16(REG_VSYNC1, 3);

GD.wr(REG_CSPREAD, 0);

GD.wr(REG_DITHER, 1);

GD.wr(REG_PCLK_POL, 0);

GD.wr(REG_PCLK, 2);

GD.wr(REG_SWIZZLE, 0);


}



void loop()

{

GD.Clear();

GD.ColorMask(1, 1, 1, 0);

GD.Begin(BITMAPS);

GD.Vertex2ii(0, 0);



GD.ColorMask(0, 0, 0, 1);



int x0 = 160, x1 = 240, x2 = 320;

int y0 = 56, y1 = 136, y2 = 216;

button(x0, y0, 1); button(x1, y0, 2); button(x2, y0, 3);

button(x0, y1, 4); button(x1, y1, 5); button(x2, y1, 6);

button(x0, y2, 7); button(x1, y2, 8); button(x2, y2, 9);



GD.ColorMask(1, 1, 1, 1);

GD.ColorRGB(0xffffff);

GD.BlendFunc(DST_ALPHA, ONE_MINUS_DST_ALPHA);

GD.Begin(RECTS);

GD.Vertex2ii(0, 0); GD.Vertex2ii(480, 272);



GD.ColorMask(1, 1, 1, 0);

GD.Begin(BITMAPS);



GD.BitmapHandle(1); //this image is not loading on the screen

GD.Vertex2f(16* 700, 16 * 380);



GD.swap();

}

[jamesbowman]

You need to restore the alpha blending state, by doing


GD.BlendFunc(DST_ALPHA, ONE_MINUS_DST_ALPHA);


[iinfinityy]

Mar 10, 2021 20:04:33 GMT -8 jamesbowman said:

You need to restore the alpha blending state, by doing


GD.BlendFunc(DST_ALPHA, ONE_MINUS_DST_ALPHA);


Thank you works great