Start separating out the SDL-related stuff in Widgets.

Widgets/FrameBuffer.cpp

@@ -0,0 +1,92 @@
+#include "FrameBuffer.h"
+#include "GraphicsBitmap.h"
+#include <AK/Assertions.h>
+
+FrameBuffer* s_the = nullptr;
+
+FrameBuffer& FrameBuffer::the()
+{
+    ASSERT(s_the);
+    return *s_the;
+}
+
+FrameBuffer::FrameBuffer(unsigned width, unsigned height)
+    : AbstractScreen(width, height)
+{
+    ASSERT(!s_the);
+    s_the = this;
+#ifdef USE_SDL
+    initializeSDL();
+#endif
+}
+
+FrameBuffer::~FrameBuffer()
+{
+#ifdef USE_SDL
+    SDL_DestroyWindow(m_window);
+    m_surface = nullptr;
+    m_window = nullptr;
+    SDL_Quit();
+#endif
+}
+
+void FrameBuffer::show()
+{
+}
+
+#ifdef USE_SDL
+void FrameBuffer::initializeSDL()
+{
+    if (m_window)
+        return;
+
+    if (SDL_Init(SDL_INIT_VIDEO) < 0) {
+        ASSERT_NOT_REACHED();
+    }
+
+    m_window = SDL_CreateWindow(
+        "FrameBuffer",
+        SDL_WINDOWPOS_UNDEFINED, 
+        SDL_WINDOWPOS_UNDEFINED, 
+        width(),
+        height(),
+        SDL_WINDOW_SHOWN);
+
+    ASSERT(m_window);
+
+    m_surface = SDL_GetWindowSurface(m_window);
+    ASSERT(m_surface);
+
+    SDL_FillRect(m_surface, nullptr, SDL_MapRGB(m_surface->format, 0xff, 0xff, 0xff));
+
+    SDL_UpdateWindowSurface(m_window);
+}
+#endif
+
+dword* FrameBuffer::scanline(int y)
+{
+#ifdef USE_SDL
+    return (dword*)(((byte*)m_surface->pixels) + (y * m_surface->pitch));
+#endif
+}
+
+void FrameBuffer::blit(const Point& position, GraphicsBitmap& bitmap)
+{
+    Rect dst_rect(position, bitmap.size());
+    //printf("blit at %d,%d %dx%d\n", dst_rect.x(), dst_rect.y(), dst_rect.width(), dst_rect.height());
+    dst_rect.intersect(rect());
+    //printf("    -> intersection %d,%d %dx%d\n", dst_rect.x(), dst_rect.y(), dst_rect.width(), dst_rect.height());
+
+    for (int y = 0; y < dst_rect.height(); ++y) {
+        auto* framebuffer_scanline = scanline(position.y() + y);
+        auto* bitmap_scanline = bitmap.scanline(y);
+        memcpy(framebuffer_scanline + dst_rect.x(), bitmap_scanline + (dst_rect.x() - position.x()), dst_rect.width() * 4);
+    }
+}
+
+void FrameBuffer::flush()
+{
+#ifdef USE_SDL
+    SDL_UpdateWindowSurface(m_window);
+#endif
+}