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Add support for changing screen resolution

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This commit is contained in:
Lauri Kenttä
2016-06-02 22:25:46 +03:00
parent dae1a9abce
commit efdd91a6d8
4 changed files with 75 additions and 0 deletions
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BIN
config.txt
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15
src/config.c
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@@ -76,6 +76,17 @@ static void ReadConfigImage(struct HackBGRT_config* config, const CHAR16* line)
SetBMPWithRandom(config, weight, action, ParseCoordinate(x, action), ParseCoordinate(y, action), f);
}
static void ReadConfigResolution(struct HackBGRT_config* config, const CHAR16* line) {
const CHAR16* x = line;
const CHAR16* y = StrStrAfter(line, L"x");
if (x && *x && y && *y) {
config->resolution_x = *x == '-' ? -(int)Atoi(x+1) : (int)Atoi(x);
config->resolution_y = *y == '-' ? -(int)Atoi(y+1) : (int)Atoi(y);
} else {
Print(L"HackBGRT: Invalid resolution line: %s\n", line);
}
}
void ReadConfigLine(struct HackBGRT_config* config, EFI_FILE_HANDLE root_dir, const CHAR16* line) {
line = TrimLeft(line);
if (line[0] == L'#' || line[0] == 0) {
@@ -98,5 +109,9 @@ void ReadConfigLine(struct HackBGRT_config* config, EFI_FILE_HANDLE root_dir, co
ReadConfigFile(config, root_dir, line + 7);
return;
}
if (StrnCmp(line, L"resolution=", 11) == 0) {
ReadConfigResolution(config, line + 11);
return;
}
Print(L"Unknown configuration directive: %s\n", line);
}

2
src/config.h
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@@ -28,6 +28,8 @@ struct HackBGRT_config {
int image_x;
int image_y;
int image_weight_sum;
int resolution_x;
int resolution_y;
const CHAR16* boot_path;
};

58
src/main.c
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@@ -34,6 +34,63 @@ static EFI_GRAPHICS_OUTPUT_PROTOCOL* GOP(void) {
return gop;
}
/**
* Set screen resolution. If there is no exact match, try to find a bigger one.
*
* @param w Horizontal resolution. 0 for max, -1 for current.
* @param h Vertical resolution. 0 for max, -1 for current.
*/
static void SetResolution(int w, int h) {
EFI_GRAPHICS_OUTPUT_PROTOCOL* gop = GOP();
if (!gop) {
Debug(L"GOP not found!\n");
return;
}
UINTN best_i = gop->Mode->Mode;
int best_w = gop->Mode->Info->HorizontalResolution;
int best_h = gop->Mode->Info->VerticalResolution;
w = (w <= 0 ? w < 0 ? best_w : 0x7fffffff : w);
h = (h <= 0 ? h < 0 ? best_h : 0x7fffffff : h);
Debug(L"Looking for resolution %dx%d...\n", w, h);
for (UINT32 i = gop->Mode->MaxMode; i--;) {
int new_w = 0, new_h = 0;
EFI_GRAPHICS_OUTPUT_MODE_INFORMATION* info = 0;
UINTN info_size;
if (EFI_ERROR(gop->QueryMode(gop, i, &info_size, &info))) {
continue;
}
if (info_size < sizeof(*info)) {
FreePool(info);
continue;
}
new_w = info->HorizontalResolution;
new_h = info->VerticalResolution;
FreePool(info);
// Sum of missing w/h should be minimal.
int new_missing = max(w - new_w, 0) + max(h - new_h, 0);
int best_missing = max(w - best_w, 0) + max(h - best_h, 0);
if (new_missing > best_missing) {
continue;
}
// Sum of extra w/h should be minimal.
int new_over = max(-w + new_w, 0) + max(-h + new_h, 0);
int best_over = max(-w + best_w, 0) + max(-h + best_h, 0);
if (new_missing == best_missing && new_over >= best_over) {
continue;
}
best_w = new_w;
best_h = new_h;
best_i = i;
}
Debug(L"Found resolution %dx%d.\n", best_w, best_h);
if (best_i != gop->Mode->Mode) {
gop->SetMode(gop, best_i);
}
}
/**
* Select the correct coordinate (manual, automatic, native)
*
@@ -295,6 +352,7 @@ EFI_STATUS EFIAPI EfiMain(EFI_HANDLE image_handle, EFI_SYSTEM_TABLE *ST_) {
}
Debug = config.debug ? Print : NullPrint;
SetResolution(config.resolution_x, config.resolution_y);
HackBgrt(root_dir);
if (!config.boot_path) {