thooge/esp32-nmea2000-obp60
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Add frame buffer for scaled picture

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This commit is contained in:
Norbert Walter
2026-03-04 09:02:29 +00:00
parent 44e99cda50
commit c5533ab0ef
2 changed files with 61 additions and 29 deletions
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lib/obp60task/OBP60Extensions.cpp
+28
View File
@@ -60,10 +60,15 @@ GxEPD2_BW<GxEPD2_420_SE0420NQ04, GxEPD2_420_SE0420NQ04::HEIGHT> & getdisplay(){r
// panel device + offscreen shadow framebuffer
static LGFX panelDisplay;
static LGFXCanvas shadowDisplay(&panelDisplay);
static LGFXCanvas scaleDisplay(&panelDisplay);
static bool shadowDisplayInitialized = false;
static bool scaleDisplayInitialized = false;
static uint16_t scaleDisplayWidth = 0;
static uint16_t scaleDisplayHeight = 0;
LGFXCanvas & getdisplay(){return shadowDisplay;}
LGFX & getpaneldisplay(){return panelDisplay;}
LGFXCanvas & getscaleddisplay(){return scaleDisplay;}
bool initDisplayShadowBuffer(){
if (shadowDisplayInitialized) return true;
@@ -81,6 +86,29 @@ bool initDisplayShadowBuffer(){
shadowDisplayInitialized = true;
return true;
}
bool initDisplayScaleBuffer(uint16_t width, uint16_t height){
if (scaleDisplayInitialized && scaleDisplayWidth == width && scaleDisplayHeight == height) {
return true;
}
scaleDisplay.deleteSprite();
scaleDisplay.setPsram(true);
scaleDisplay.setColorDepth(16);
scaleDisplay.setTextDatum(textdatum_t::baseline_left);
if (scaleDisplay.createSprite(width, height) == nullptr) {
scaleDisplayInitialized = false;
scaleDisplayWidth = 0;
scaleDisplayHeight = 0;
return false;
}
scaleDisplayWidth = width;
scaleDisplayHeight = height;
scaleDisplayInitialized = true;
return true;
}
#endif
// Horter I2C moduls
lib/obp60task/OBP60Extensions.h
+33 -29
View File
@@ -423,7 +423,9 @@ private:
LGFXCanvas & getdisplay();
LGFX & getpaneldisplay();
LGFXCanvas & getscaleddisplay();
bool initDisplayShadowBuffer();
bool initDisplayScaleBuffer(uint16_t width, uint16_t height);
#endif
// Page display return values
@@ -568,42 +570,44 @@ inline void displayNextPage() {
const uint16_t drawX = static_cast<uint16_t>((dstW - targetW) / 2U);
const uint16_t drawY = static_cast<uint16_t>((dstH - targetH) / 2U);
dst.startWrite();
const uint16_t borderColor = src.readPixel(0, 0);
if (drawX > 0) {
dst.fillRect(0, drawY, drawX, targetH, borderColor);
dst.fillRect(drawX + targetW, drawY, dstW - (drawX + targetW), targetH, borderColor);
}
if (initDisplayScaleBuffer(dstW, dstH)) {
LGFXCanvas &scaled = getscaleddisplay();
scaled.fillScreen(borderColor);
for (uint16_t y = 0; y < targetH; ++y) {
const uint32_t syfp = (targetH > 1)
? (static_cast<uint32_t>(y) * (srcH - 1) * 256U) / (targetH - 1)
: 0;
const uint16_t sy0 = static_cast<uint16_t>(syfp >> 8);
const uint16_t sy1 = (sy0 + 1 < srcH) ? static_cast<uint16_t>(sy0 + 1) : sy0;
const uint16_t wy = static_cast<uint16_t>(syfp & 0xFFU);
for (uint16_t x = 0; x < targetW; ++x) {
const uint32_t sxfp = (targetW > 1)
? (static_cast<uint32_t>(x) * (srcW - 1) * 256U) / (targetW - 1)
for (uint16_t y = 0; y < targetH; ++y) {
const uint32_t syfp = (targetH > 1)
? (static_cast<uint32_t>(y) * (srcH - 1) * 256U) / (targetH - 1)
: 0;
const uint16_t sx0 = static_cast<uint16_t>(sxfp >> 8);
const uint16_t sx1 = (sx0 + 1 < srcW) ? static_cast<uint16_t>(sx0 + 1) : sx0;
const uint16_t sy0 = static_cast<uint16_t>(syfp >> 8);
const uint16_t sy1 = (sy0 + 1 < srcH) ? static_cast<uint16_t>(sy0 + 1) : sy0;
const uint16_t wy = static_cast<uint16_t>(syfp & 0xFFU);
#if OBP_TFT_SCALE_ANTIALIAS
const uint16_t wx = static_cast<uint16_t>(sxfp & 0xFFU);
const uint16_t color = sampleBilinearRgb565(src, sx0, sy0, sx1, sy1, wx, wy);
#else
const uint16_t color = src.readPixel(sx0, sy0);
#endif
for (uint16_t x = 0; x < targetW; ++x) {
const uint32_t sxfp = (targetW > 1)
? (static_cast<uint32_t>(x) * (srcW - 1) * 256U) / (targetW - 1)
: 0;
const uint16_t sx0 = static_cast<uint16_t>(sxfp >> 8);
const uint16_t sx1 = (sx0 + 1 < srcW) ? static_cast<uint16_t>(sx0 + 1) : sx0;
dst.drawPixel(drawX + x, drawY + y, color);
}
if ((y & 0x0F) == 0) {
yield();
#if OBP_TFT_SCALE_ANTIALIAS
const uint16_t wx = static_cast<uint16_t>(sxfp & 0xFFU);
const uint16_t color = sampleBilinearRgb565(src, sx0, sy0, sx1, sy1, wx, wy);
#else
const uint16_t color = src.readPixel(sx0, sy0);
#endif
scaled.drawPixel(drawX + x, drawY + y, color);
}
if ((y & 0x0F) == 0) {
yield();
}
}
scaled.pushSprite(0, 0);
} else {
src.pushSprite(drawX, drawY);
}
dst.endWrite();
#endif
}
#else