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Pi Firmware: Use Pi Framebuffer directly (supports 4 and 8 bpp) 

Change-Id: I280a06d54624834cc4d937227f25b1bc75045c6c
pull/45/head^2
David Banks 2019-03-11 13:31:37 +00:00
rodzic 562fcf8f4d
commit 4c6fbccf58
1 zmienionych plików z 20 dodań i 30 usunięć
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src/filesystem.c
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@ -20,41 +20,31 @@ static int capture_id = -1;
#ifdef USE_LODEPNG
// TODO: Using LCT_PALETTE colour type we can almost point LodePNG directly
// at the frame buffer. The only thing stopping us is the pitch != width.
// Would be interesting to experiment using this.
static uint8_t rgb8_buffer[8 * 1024 * 1024] __attribute__((aligned(0x4000)));
static int generate_png(capture_info_t *capinfo, uint8_t **png, unsigned int *png_len ) {
// TODO: Take account of current palette
LodePNGState state;
lodepng_state_init(&state);
state.info_raw.colortype = LCT_PALETTE;
state.info_raw.bitdepth = capinfo->bpp;
state.info_png.color.colortype = LCT_PALETTE;
state.info_png.color.bitdepth = 8;
uint8_t *pp = rgb8_buffer;
for (int y = 0; y < capinfo->height; y++) {
uint8_t *fp = capinfo->fb + capinfo->pitch * y;
if (capinfo->bpp == 8) {
for (int x = 0; x < capinfo->width; x++) {
uint8_t single_pixel = *fp++;
*pp++ = (single_pixel & 0x01) ? 255 : 0;
*pp++ = (single_pixel & 0x02) ? 255 : 0;
*pp++ = (single_pixel & 0x04) ? 255 : 0;
}
} else {
for (int x = 0; x < capinfo->width << 1; x++) {
uint8_t double_pixel = *fp++;
*pp++ = (double_pixel & 0x10) ? 255 : 0;
*pp++ = (double_pixel & 0x20) ? 255 : 0;
*pp++ = (double_pixel & 0x40) ? 255 : 0;
*pp++ = (double_pixel & 0x01) ? 255 : 0;
*pp++ = (double_pixel & 0x02) ? 255 : 0;
*pp++ = (double_pixel & 0x04) ? 255 : 0;
}
}
int width = capinfo->pitch;
int height = capinfo->height;
if (capinfo->bpp == 4) {
width *= 2;
}
unsigned result = lodepng_encode_memory(png, png_len, rgb8_buffer, capinfo->width, capinfo->height, LCT_RGB, 8);
// TODO: Take account of current palette
for (int i = 0; i < (1 << capinfo->bpp); i++) {
int r = (i & 0x01) ? 255 : 0;
int g = (i & 0x02) ? 255 : 0;
int b = (i & 0x04) ? 255 : 0;
lodepng_palette_add(&state.info_png.color, r, g, b, 255);
lodepng_palette_add(&state.info_raw, r, g, b, 255);
}
unsigned result = lodepng_encode(png, png_len, capinfo->fb, width, height, &state);
if (result) {
log_warn("lodepng_encode32 failed (result = %d)", result);