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feat: Add displayGrayscaleBase method for differential refresh

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(#2334)

Introduces a new display method that prepares the framebuffer as a base
frame for grayscale overlays. On X3 panels, this uses the OEM
differential base waveform (AA-pre-BW) without forcing a resync. Other
panels fall back to normal display with configurable refresh mode.


Dependent upon matching SDK commit to work
This commit is contained in:
Justin Mitchell
2026-06-24 07:53:19 -04:00
committed by GitHub
parent 9ad2da0950
commit f6e59aab72
7 changed files with 80 additions and 3 deletions
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lib/GfxRenderer/GfxRenderer.cpp
+24
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@@ -1587,6 +1587,30 @@ size_t GfxRenderer::getBufferSize() const { return frameBufferSize; }
// unused
// void GfxRenderer::grayscaleRevert() const { display.grayscaleRevert(); }
void GfxRenderer::displayGrayscaleBase(HalDisplay::RefreshMode fallback) const {
display.displayGrayscaleBase(fallback, fadingFix);
}
void GfxRenderer::preconditionGrayscale() const { display.preconditionGrayscale(); }
void GfxRenderer::preconditionGrayscale(int x, int y, int w, int h) const {
if (w <= 0 || h <= 0) return;
// Rotate the logical rect's opposite corners to physical panel coords; the
// physical bbox stays axis-aligned for all four orientations.
int ax, ay, bx, by;
rotateCoordinates(orientation, x, y, &ax, &ay, panelWidth, panelHeight);
rotateCoordinates(orientation, x + w - 1, y + h - 1, &bx, &by, panelWidth, panelHeight);
int x0 = ax < bx ? ax : bx, x1 = ax > bx ? ax : bx;
int y0 = ay < by ? ay : by, y1 = ay > by ? ay : by;
if (x0 < 0) x0 = 0;
if (y0 < 0) y0 = 0;
if (x1 >= panelWidth) x1 = panelWidth - 1;
if (y1 >= panelHeight) y1 = panelHeight - 1;
if (x1 < x0 || y1 < y0) return;
display.preconditionGrayscale(static_cast<uint16_t>(x0), static_cast<uint16_t>(y0),
static_cast<uint16_t>(x1 - x0 + 1), static_cast<uint16_t>(y1 - y0 + 1));
}
void GfxRenderer::copyGrayscaleLsbBuffers() const { display.copyGrayscaleLsbBuffers(frameBuffer); }
void GfxRenderer::copyGrayscaleMsbBuffers() const { display.copyGrayscaleMsbBuffers(frameBuffer); }
lib/GfxRenderer/GfxRenderer.h
+10
View File
@@ -218,6 +218,16 @@ class GfxRenderer {
// Grayscale functions
void setRenderMode(const RenderMode mode) { this->renderMode = mode; }
RenderMode getRenderMode() const { return renderMode; }
// Grayscale preconditioning settle pass (no-op on X4). The rect overload
// takes the gray region in LOGICAL screen coordinates and rotates it to the
// panel; the no-arg overload settles the full frame. Call after the BW base
// frame is displayed and before the grayscale planes are written.
void preconditionGrayscale() const;
void preconditionGrayscale(int x, int y, int w, int h) const;
// Display the framebuffer as the base frame for a grayscale overlay that
// follows (X3: OEM differential base waveform; others: plain display with
// `fallback`).
void displayGrayscaleBase(HalDisplay::RefreshMode fallback = HalDisplay::HALF_REFRESH) const;
void copyGrayscaleLsbBuffers() const;
void copyGrayscaleMsbBuffers() const;
void displayGrayBuffer() const;