mirror of
https://github.com/spice2x/spice2x.github.io.git
synced 2026-10-06 10:08:13 -07:00
fix line endings
This commit is contained in:
bicarus-dev
+213
-213
@@ -1,213 +1,213 @@
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#include "gdi_overlay.h"
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#include <cstddef>
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#include "util/logging.h"
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namespace {
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// the back buffer matches the window DC; the software buffer has a fixed 32-bit layout
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enum class BufferType {
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TargetCompatible,
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Bgra32,
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};
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struct GdiBuffer {
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HDC dc = nullptr;
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HBITMAP bitmap = nullptr;
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// bitmap originally selected into the memory DC, restored before cleanup
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HGDIOBJ old_bitmap = nullptr;
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int width = 0;
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int height = 0;
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};
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// back buffer holds the complete frame; overlay buffer holds ImGui software pixels
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GdiBuffer BACK_BUFFER;
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GdiBuffer OVERLAY_BUFFER;
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void release_buffer(GdiBuffer &buffer) {
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// destroy the DC before the bitmap so cleanup is safe even if restoration fails
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if (buffer.dc != nullptr) {
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if (buffer.old_bitmap != nullptr && buffer.old_bitmap != HGDI_ERROR) {
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SelectObject(buffer.dc, buffer.old_bitmap);
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}
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DeleteDC(buffer.dc);
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}
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if (buffer.bitmap != nullptr) {
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DeleteObject(buffer.bitmap);
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}
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buffer = {};
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}
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// ensures the buffer has a memory DC with a bitmap of the requested size and type
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// selected into it. a matching allocation is reused; otherwise the old resources are
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// released and recreated. returns false if the dimensions or any GDI operation fail.
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bool ensure_buffer(
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GdiBuffer &buffer,
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HDC target_dc,
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int width,
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int height,
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BufferType type,
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const char *name) {
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if (width <= 0 || height <= 0) {
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return false;
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}
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if (buffer.dc != nullptr && buffer.bitmap != nullptr &&
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buffer.width == width && buffer.height == height) {
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return true;
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}
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// keep allocations across frames and recreate only after a size change
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release_buffer(buffer);
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buffer.dc = CreateCompatibleDC(target_dc);
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if (buffer.dc == nullptr) {
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log_warning("touch", "failed to create {} DC: {}", name, GetLastError());
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return false;
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}
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// compatible bitmaps are fast presentation targets; BGRA bitmaps accept raw pixels
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if (type == BufferType::TargetCompatible) {
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buffer.bitmap = CreateCompatibleBitmap(target_dc, width, height);
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} else {
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buffer.bitmap = CreateBitmap(width, height, 1, sizeof(uint32_t) * 8, nullptr);
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}
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if (buffer.bitmap == nullptr) {
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log_warning("touch", "failed to create {} bitmap: {}", name, GetLastError());
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release_buffer(buffer);
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return false;
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}
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buffer.old_bitmap = SelectObject(buffer.dc, buffer.bitmap);
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if (buffer.old_bitmap == nullptr || buffer.old_bitmap == HGDI_ERROR) {
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log_warning("touch", "failed to select {} bitmap: {}", name, GetLastError());
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release_buffer(buffer);
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return false;
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}
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buffer.width = width;
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buffer.height = height;
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return true;
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}
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bool update_overlay_buffer(
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HDC target_dc,
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const uint32_t *pixels,
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bool pixels_dirty,
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int width,
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int height) {
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if (pixels == nullptr) {
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return false;
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}
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bool needs_update = pixels_dirty || OVERLAY_BUFFER.bitmap == nullptr ||
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OVERLAY_BUFFER.width != width || OVERLAY_BUFFER.height != height;
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if (!ensure_buffer(
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OVERLAY_BUFFER,
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target_dc,
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width,
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height,
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BufferType::Bgra32,
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"software overlay")) {
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return false;
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}
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if (!needs_update) {
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return true;
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}
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// SetDIBits requires the destination bitmap not to be selected into a DC
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HGDIOBJ overlay_bitmap =
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SelectObject(OVERLAY_BUFFER.dc, OVERLAY_BUFFER.old_bitmap);
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if (overlay_bitmap == nullptr || overlay_bitmap == HGDI_ERROR) {
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log_warning("touch", "failed to deselect software overlay bitmap: {}", GetLastError());
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release_buffer(OVERLAY_BUFFER);
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return false;
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}
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BITMAPINFO bitmap_info {};
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bitmap_info.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
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bitmap_info.bmiHeader.biWidth = width;
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bitmap_info.bmiHeader.biHeight = -height;
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bitmap_info.bmiHeader.biPlanes = 1;
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bitmap_info.bmiHeader.biBitCount = sizeof(uint32_t) * 8;
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bitmap_info.bmiHeader.biCompression = BI_RGB;
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int copied_lines = SetDIBits(
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target_dc,
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OVERLAY_BUFFER.bitmap,
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0,
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height,
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pixels,
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&bitmap_info,
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DIB_RGB_COLORS);
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HGDIOBJ old_bitmap = SelectObject(OVERLAY_BUFFER.dc, OVERLAY_BUFFER.bitmap);
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if (old_bitmap == nullptr || old_bitmap == HGDI_ERROR) {
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log_warning("touch", "failed to reselect software overlay bitmap: {}", GetLastError());
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release_buffer(OVERLAY_BUFFER);
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return false;
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}
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OVERLAY_BUFFER.old_bitmap = old_bitmap;
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if (copied_lines != height) {
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log_warning("touch", "failed to update software overlay bitmap: {} of {} lines copied",
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copied_lines, height);
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release_buffer(OVERLAY_BUFFER);
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return false;
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}
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return true;
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}
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}
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HDC touch_gdi_overlay_begin_frame(
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HDC target_dc,
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HBRUSH background_brush,
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int width,
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int height,
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const uint32_t *overlay_pixels,
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bool overlay_pixels_dirty,
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int overlay_width,
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int overlay_height) {
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if (!ensure_buffer(
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BACK_BUFFER,
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target_dc,
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width,
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height,
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BufferType::TargetCompatible,
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"overlay back buffer")) {
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return nullptr;
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}
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HDC draw_dc = BACK_BUFFER.dc;
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SetBkMode(draw_dc, TRANSPARENT);
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// start each frame from the transparent color-key background
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RECT buffer_rect {0, 0, width, height};
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FillRect(draw_dc, &buffer_rect, background_brush);
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if (update_overlay_buffer(
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target_dc,
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overlay_pixels,
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overlay_pixels_dirty,
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overlay_width,
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overlay_height) &&
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!BitBlt(draw_dc, 0, 0, overlay_width, overlay_height,
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OVERLAY_BUFFER.dc, 0, 0, SRCCOPY)) {
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log_warning("touch", "failed to draw software overlay bitmap: {}", GetLastError());
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}
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return draw_dc;
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}
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void touch_gdi_overlay_present(HDC target_dc) {
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// one full-window blit exposes the completed frame without an intermediate erase
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if (!BitBlt(target_dc, 0, 0, BACK_BUFFER.width, BACK_BUFFER.height,
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BACK_BUFFER.dc, 0, 0, SRCCOPY)) {
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log_warning("touch", "failed to present overlay back buffer: {}", GetLastError());
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}
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}
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void touch_gdi_overlay_release() {
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release_buffer(BACK_BUFFER);
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release_buffer(OVERLAY_BUFFER);
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}
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#include "gdi_overlay.h"
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#include <cstddef>
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#include "util/logging.h"
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namespace {
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// the back buffer matches the window DC; the software buffer has a fixed 32-bit layout
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enum class BufferType {
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TargetCompatible,
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Bgra32,
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};
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struct GdiBuffer {
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HDC dc = nullptr;
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HBITMAP bitmap = nullptr;
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// bitmap originally selected into the memory DC, restored before cleanup
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HGDIOBJ old_bitmap = nullptr;
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int width = 0;
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int height = 0;
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};
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// back buffer holds the complete frame; overlay buffer holds ImGui software pixels
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GdiBuffer BACK_BUFFER;
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GdiBuffer OVERLAY_BUFFER;
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void release_buffer(GdiBuffer &buffer) {
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// destroy the DC before the bitmap so cleanup is safe even if restoration fails
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if (buffer.dc != nullptr) {
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if (buffer.old_bitmap != nullptr && buffer.old_bitmap != HGDI_ERROR) {
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SelectObject(buffer.dc, buffer.old_bitmap);
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}
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DeleteDC(buffer.dc);
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}
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if (buffer.bitmap != nullptr) {
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DeleteObject(buffer.bitmap);
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}
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buffer = {};
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}
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// ensures the buffer has a memory DC with a bitmap of the requested size and type
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// selected into it. a matching allocation is reused; otherwise the old resources are
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// released and recreated. returns false if the dimensions or any GDI operation fail.
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bool ensure_buffer(
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GdiBuffer &buffer,
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HDC target_dc,
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int width,
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int height,
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BufferType type,
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const char *name) {
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if (width <= 0 || height <= 0) {
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return false;
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}
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if (buffer.dc != nullptr && buffer.bitmap != nullptr &&
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buffer.width == width && buffer.height == height) {
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return true;
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}
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// keep allocations across frames and recreate only after a size change
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release_buffer(buffer);
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buffer.dc = CreateCompatibleDC(target_dc);
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if (buffer.dc == nullptr) {
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log_warning("touch", "failed to create {} DC: {}", name, GetLastError());
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return false;
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}
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// compatible bitmaps are fast presentation targets; BGRA bitmaps accept raw pixels
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if (type == BufferType::TargetCompatible) {
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buffer.bitmap = CreateCompatibleBitmap(target_dc, width, height);
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} else {
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buffer.bitmap = CreateBitmap(width, height, 1, sizeof(uint32_t) * 8, nullptr);
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}
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if (buffer.bitmap == nullptr) {
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log_warning("touch", "failed to create {} bitmap: {}", name, GetLastError());
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release_buffer(buffer);
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return false;
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}
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buffer.old_bitmap = SelectObject(buffer.dc, buffer.bitmap);
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if (buffer.old_bitmap == nullptr || buffer.old_bitmap == HGDI_ERROR) {
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log_warning("touch", "failed to select {} bitmap: {}", name, GetLastError());
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release_buffer(buffer);
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return false;
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}
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buffer.width = width;
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buffer.height = height;
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return true;
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}
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bool update_overlay_buffer(
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HDC target_dc,
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const uint32_t *pixels,
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bool pixels_dirty,
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int width,
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int height) {
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if (pixels == nullptr) {
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return false;
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}
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bool needs_update = pixels_dirty || OVERLAY_BUFFER.bitmap == nullptr ||
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OVERLAY_BUFFER.width != width || OVERLAY_BUFFER.height != height;
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if (!ensure_buffer(
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OVERLAY_BUFFER,
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target_dc,
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width,
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height,
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BufferType::Bgra32,
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"software overlay")) {
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return false;
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}
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if (!needs_update) {
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return true;
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}
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// SetDIBits requires the destination bitmap not to be selected into a DC
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HGDIOBJ overlay_bitmap =
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SelectObject(OVERLAY_BUFFER.dc, OVERLAY_BUFFER.old_bitmap);
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if (overlay_bitmap == nullptr || overlay_bitmap == HGDI_ERROR) {
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log_warning("touch", "failed to deselect software overlay bitmap: {}", GetLastError());
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release_buffer(OVERLAY_BUFFER);
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return false;
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}
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BITMAPINFO bitmap_info {};
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bitmap_info.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
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bitmap_info.bmiHeader.biWidth = width;
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bitmap_info.bmiHeader.biHeight = -height;
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bitmap_info.bmiHeader.biPlanes = 1;
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bitmap_info.bmiHeader.biBitCount = sizeof(uint32_t) * 8;
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bitmap_info.bmiHeader.biCompression = BI_RGB;
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int copied_lines = SetDIBits(
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target_dc,
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OVERLAY_BUFFER.bitmap,
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0,
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height,
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pixels,
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&bitmap_info,
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DIB_RGB_COLORS);
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HGDIOBJ old_bitmap = SelectObject(OVERLAY_BUFFER.dc, OVERLAY_BUFFER.bitmap);
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if (old_bitmap == nullptr || old_bitmap == HGDI_ERROR) {
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log_warning("touch", "failed to reselect software overlay bitmap: {}", GetLastError());
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release_buffer(OVERLAY_BUFFER);
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return false;
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}
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OVERLAY_BUFFER.old_bitmap = old_bitmap;
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if (copied_lines != height) {
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log_warning("touch", "failed to update software overlay bitmap: {} of {} lines copied",
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copied_lines, height);
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release_buffer(OVERLAY_BUFFER);
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return false;
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}
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return true;
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}
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}
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HDC touch_gdi_overlay_begin_frame(
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HDC target_dc,
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HBRUSH background_brush,
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int width,
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int height,
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const uint32_t *overlay_pixels,
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bool overlay_pixels_dirty,
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int overlay_width,
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int overlay_height) {
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if (!ensure_buffer(
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BACK_BUFFER,
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target_dc,
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width,
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height,
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BufferType::TargetCompatible,
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"overlay back buffer")) {
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return nullptr;
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}
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HDC draw_dc = BACK_BUFFER.dc;
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SetBkMode(draw_dc, TRANSPARENT);
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// start each frame from the transparent color-key background
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RECT buffer_rect {0, 0, width, height};
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FillRect(draw_dc, &buffer_rect, background_brush);
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if (update_overlay_buffer(
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target_dc,
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overlay_pixels,
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overlay_pixels_dirty,
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overlay_width,
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overlay_height) &&
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!BitBlt(draw_dc, 0, 0, overlay_width, overlay_height,
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OVERLAY_BUFFER.dc, 0, 0, SRCCOPY)) {
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log_warning("touch", "failed to draw software overlay bitmap: {}", GetLastError());
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}
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return draw_dc;
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}
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void touch_gdi_overlay_present(HDC target_dc) {
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// one full-window blit exposes the completed frame without an intermediate erase
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if (!BitBlt(target_dc, 0, 0, BACK_BUFFER.width, BACK_BUFFER.height,
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BACK_BUFFER.dc, 0, 0, SRCCOPY)) {
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log_warning("touch", "failed to present overlay back buffer: {}", GetLastError());
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}
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}
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void touch_gdi_overlay_release() {
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release_buffer(BACK_BUFFER);
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release_buffer(OVERLAY_BUFFER);
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}
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Block a user