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add ClearWindow optimization

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This commit is contained in:
philippe44
2020-02-24 23:43:03 -08:00
parent f008229acd
commit 9a5d8dac4a
3 changed files with 28 additions and 5 deletions
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19
components/display/core/gds.c
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@@ -61,9 +61,22 @@ void GDS_ClearWindow( struct GDS_Device* Device, int x1, int y1, int x2, int y2,
// driver can provide onw optimized clear window
if (Device->ClearWindow) {
Device->ClearWindow( Device, x1, y1, x2, y2, Color );
// cheap optimization on boundaries
if (x1 == 0 && x2 == Device->Width - 1 && y1 % 8 == 0 && (y2 + 1) % 8 == 0) {
memset( Device->Framebuffer + (y1 / 8) * Device->Width, 0, (y2 - y1 + 1) / 8 * Device->Width );
} else if (Device->Depth == 1) {
// single shot if we erase all screen
if (x2 - x1 == Device->Width - 1 && y2 - y1 == Device->Height - 1) {
memset( Device->Framebuffer, Color, Device->FramebufferSize );
} else {
uint8_t _Color = Color == GDS_COLOR_BLACK ? 0: 0xff;
uint8_t Width = Device->Width;
// try to do byte processing as much as possible
for (int c = x1; c <= x2; c++) {
int r = y1;
while (r & 0x07 && r <= y2) GDS_DrawPixelFast( Device, c, r++, Color);
for (; (r >> 3) < (y2 >> 3); r++) Device->Framebuffer[(r >> 3) * Width + c] = _Color;
// memset(Device->Framebuffer + (r >> 3) * Width, _Color, (y2 >> 3) - (r >> 3));
while (r <= y2) GDS_DrawPixelFast( Device, c, r++, Color);
}
}
} else {
for (int y = y1; y <= y2; y++) {
for (int x = x1; x <= x2; x++) {

9
components/display/core/gds.h
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@@ -4,6 +4,15 @@
#include <stdint.h>
#include <stdbool.h>
/* NOTE for drivers:
The build-in DrawPixel(Fast), DrawCBR and ClearWindow are optimized for 1 bit
and 4 bits screen depth. For any other type of screen, DrawCBR and ClearWindow
default to use DrawPixel, which is very sub-optimal. For such other depth, you
must supply the DrawPixelFast. The built-in 1 bit depth function are only for
screen with vertical framing (1 byte = 8 lines). For example SSD1326 in
monochrome mode is not such type of screen, SH1106 and SSD1306 are
*/
enum { GDS_COLOR_L0 = 0, GDS_COLOR_L1, GDS_COLOR_L2, GDS_COLOR_L3, GDS_COLOR_L4, GDS_COLOR_L5, GDS_COLOR_L6, GDS_COLOR_L7,
GDS_COLOR_L8, GDS_COLOR_L9, GDS_COLOR_L10, GDS_COLOR_L11, GDS_COLOR_L12, GDS_COLOR_L13, GDS_COLOR_L14, GDS_COLOR_L15,
};

5
components/display/core/gds_private.h
View File

@@ -93,7 +93,7 @@ struct GDS_Device {
bool FontForceMonospace;
// various driver-specific method
// must provide
// must always provide
bool (*Init)( struct GDS_Device* Device);
void (*SetContrast)( struct GDS_Device* Device, uint8_t Contrast );
void (*DisplayOn)( struct GDS_Device* Device );
@@ -101,8 +101,9 @@ struct GDS_Device {
void (*SetHFlip)( struct GDS_Device* Device, bool On );
void (*SetVFlip)( struct GDS_Device* Device, bool On );
void (*Update)( struct GDS_Device* Device );
// may provide for optimization
// must provide for depth other than 1 (vertical) and 4 (may provide for optimization)
void (*DrawPixelFast)( struct GDS_Device* Device, int X, int Y, int Color );
// may provide for optimization
void (*DrawRGB16)( struct GDS_Device* Device, int x, int y, int Width, int Height, int RGB_Mode, uint16_t **Image );
void (*ClearWindow)( struct GDS_Device* Device, int x1, int y1, int x2, int y2, int Color );